Alert archive / California / Excessive Heat Warnings in 2023
Excessive Heat Warning 2, NWS Eureka, CA
NWS Eureka, CA issued this excessive heat warning at Aug 13, 2023, 6:03 AM PDT for 4 counties in California. It took effect at Aug 14, 2023, 11:00 AM PDT. It was in force for 60 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 13, 2023, 6:03 AM PDT (13:03 UTC)
- In effect from
- Aug 14, 2023, 11:00 AM PDT
- Expired
- Aug 16, 2023, 11:00 PM PDT
- In force
- 60 hr
- Issued by
- NWS Eureka, CA
Counties Humboldt County, CA, Lake County, CA, Mendocino County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 102 km from the middle of the area, began a volume at 13:07 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Oakland, CA (KOAK), launched 12:00Z, 1.1 hours before the alert went out and 267 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1748 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
244 WWUS76 KEKA 131303 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 603 AM PDT Sun Aug 13 2023 CAZ105-106-110-113-115-132115- /O.UPG.KEKA.HT.Y.0004.230814T1800Z-230817T0600Z/ /O.NEW.KEKA.EH.W.0002.230814T1800Z-230817T0600Z/ /O.NEW.KEKA.HT.Y.0005.230813T1800Z-230814T1800Z/ Northern Humboldt Interior-Southern Humboldt Interior- Northwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 603 AM PDT Sun Aug 13 2023 ...HEAT ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO 11 AM PDT MONDAY... ...EXCESSIVE HEAT WARNING IN EFFECT FROM 11 AM MONDAY TO 11 PM PDT WEDNESDAY... * WHAT...For the Excessive Heat Warning, dangerously hot conditions with temperatures up to 110 expected. For the Heat Advisory, temperatures up to 104 expected. * WHERE...Northern Humboldt Interior, Southern Humboldt Interior, Northwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake Counties. * WHEN...For the Excessive Heat Warning, from 11 AM Monday to 11 PM PDT Wednesday. For the Heat Advisory, from 11 AM this morning to 11 AM PDT Monday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ107-108-111-114-132115- /O.NEW.KEKA.EH.W.0002.230814T1800Z-230817T0600Z/ /O.EXT.KEKA.HT.Y.0004.230813T1800Z-230814T1800Z/ Northern Trinity-Southern Trinity-Northeastern Mendocino Interior- Northern Lake- 603 AM PDT Sun Aug 13 2023 ...HEAT ADVISORY NOW IN EFFECT FROM 11 AM THIS MORNING TO 11 AM PDT MONDAY... ...EXCESSIVE HEAT WARNING IN EFFECT FROM 11 AM MONDAY TO 11 PM PDT WEDNESDAY... * WHAT...For the Excessive Heat Warning, dangerously hot conditions with temperatures up to 110 expected. For the Heat Advisory, temperatures up to 104 expected. * WHERE...Northern Trinity, Southern Trinity, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...For the Excessive Heat Warning, from 11 AM Monday to 11 PM PDT Wednesday. For the Heat Advisory, from 11 AM this morning to 11 AM PDT Monday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ102-132115- /O.EXA.KEKA.HT.Y.0004.230813T1800Z-230817T0600Z/ Del Norte Interior- 603 AM PDT Sun Aug 13 2023 ...HEAT ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO 11 PM PDT WEDNESDAY... * WHAT...Temperatures up to 102 expected. * WHERE...Del Norte Interior County. * WHEN...From 11 AM this morning to 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ104-132115- /O.EXT.KEKA.HT.Y.0004.230813T1800Z-230817T0600Z/ Southwestern Humboldt- 603 AM PDT Sun Aug 13 2023 ...HEAT ADVISORY NOW IN EFFECT FROM 11 AM THIS MORNING TO 11 PM PDT WEDNESDAY... * WHAT...Temperatures up to 100 expected. * WHERE...Southwestern Humboldt County. * WHEN...From 11 AM this morning to 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
12 follow-up statements
501 WWUS76 KEKA 132104 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 204 PM PDT Sun Aug 13 2023 CAZ105-106-110-113-115-140515- /O.CON.KEKA.EH.W.0002.230814T1800Z-230817T0600Z/ /O.CON.KEKA.HT.Y.0005.000000T0000Z-230814T1800Z/ Northern Humboldt Interior-Southern Humboldt Interior- Northwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 204 PM PDT Sun Aug 13 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 AM PDT MONDAY... ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM MONDAY TO 11 PM PDT WEDNESDAY... * WHAT...For the Excessive Heat Warning, dangerously hot conditions with temperatures up to 109 expected. For the Heat Advisory, temperatures up to 103. * WHERE...Northern Humboldt Interior, Southern Humboldt Interior, Northwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake Counties. * WHEN...For the Excessive Heat Warning, from 11 AM Monday to 11 PM PDT Wednesday. For the Heat Advisory, until 11 AM PDT Monday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ107-108-111-114-140515- /O.CON.KEKA.EH.W.0002.230814T1800Z-230817T0600Z/ /O.CON.KEKA.HT.Y.0004.000000T0000Z-230814T1800Z/ Northern Trinity-Southern Trinity-Northeastern Mendocino Interior- Northern Lake- 204 PM PDT Sun Aug 13 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 AM PDT MONDAY... ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM MONDAY TO 11 PM PDT WEDNESDAY... * WHAT...For the Excessive Heat Warning, dangerously hot conditions with temperatures up to 110 expected. For the Heat Advisory, temperatures up to 106. * WHERE...Northern Trinity, Southern Trinity, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...For the Excessive Heat Warning, from 11 AM Monday to 11 PM PDT Wednesday. For the Heat Advisory, until 11 AM PDT Monday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ102-104-140515- /O.CON.KEKA.HT.Y.0004.000000T0000Z-230817T0600Z/ Del Norte Interior-Southwestern Humboldt- 204 PM PDT Sun Aug 13 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... * WHAT...Temperatures up to 103. * WHERE...Del Norte Interior and Southwestern Humboldt Counties. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
706 WWUS76 KEKA 140504 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1004 PM PDT Sun Aug 13 2023 CAZ105-106-110-113-115-141315- /O.CON.KEKA.EH.W.0002.230814T1800Z-230817T0600Z/ /O.CON.KEKA.HT.Y.0005.000000T0000Z-230814T1800Z/ Northern Humboldt Interior-Southern Humboldt Interior- Northwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 1004 PM PDT Sun Aug 13 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 AM PDT MONDAY... ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM MONDAY TO 11 PM PDT WEDNESDAY... * WHAT...For the Excessive Heat Warning, dangerously hot conditions with temperatures up to 110 expected. For the Heat Advisory, temperatures up to 103. * WHERE...Northern Humboldt Interior, Southern Humboldt Interior, Northwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake Counties. * WHEN...For the Excessive Heat Warning, from 11 AM Monday to 11 PM PDT Wednesday. For the Heat Advisory, until 11 AM PDT Monday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ107-108-111-114-141315- /O.CON.KEKA.EH.W.0002.230814T1800Z-230817T0600Z/ /O.CON.KEKA.HT.Y.0004.000000T0000Z-230814T1800Z/ Northern Trinity-Southern Trinity-Northeastern Mendocino Interior- Northern Lake- 1004 PM PDT Sun Aug 13 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 AM PDT MONDAY... ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM MONDAY TO 11 PM PDT WEDNESDAY... * WHAT...For the Excessive Heat Warning, dangerously hot conditions with temperatures up to 114 expected. For the Heat Advisory, temperatures up to 105. * WHERE...Northern Trinity, Southern Trinity, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...For the Excessive Heat Warning, from 11 AM Monday to 11 PM PDT Wednesday. For the Heat Advisory, until 11 AM PDT Monday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ102-104-141315- /O.CON.KEKA.HT.Y.0004.000000T0000Z-230817T0600Z/ Del Norte Interior-Southwestern Humboldt- 1004 PM PDT Sun Aug 13 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... * WHAT...Temperatures up to 103. * WHERE...Del Norte Interior and Southwestern Humboldt Counties. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
522 WWUS76 KEKA 141304 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 604 AM PDT Mon Aug 14 2023 CAZ105-106-110-113-115-142115- /O.CON.KEKA.EH.W.0002.230814T1800Z-230817T0600Z/ /O.CON.KEKA.HT.Y.0005.000000T0000Z-230814T1800Z/ Northern Humboldt Interior-Southern Humboldt Interior- Northwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 604 AM PDT Mon Aug 14 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 11 PM PDT WEDNESDAY... * WHAT...For the Excessive Heat Warning, dangerously hot conditions with temperatures of 100 to 110 expected. * WHERE...Northern Humboldt Interior, Southern Humboldt Interior, Northwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake Counties. * WHEN...For the Excessive Heat Warning, from 11 AM this morning to 11 PM PDT Wednesday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ107-108-111-114-142115- /O.CON.KEKA.EH.W.0002.230814T1800Z-230817T0600Z/ /O.CON.KEKA.HT.Y.0004.000000T0000Z-230814T1800Z/ Northern Trinity-Southern Trinity-Northeastern Mendocino Interior- Northern Lake- 604 AM PDT Mon Aug 14 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 11 PM PDT WEDNESDAY... * WHAT...For the Excessive Heat Warning, dangerously hot conditions with temperatures of 100 to 110 expected. * WHERE...Northern Trinity, Southern Trinity, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...For the Excessive Heat Warning, from 11 AM this morning to 11 PM PDT Wednesday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ102-104-142115- /O.CON.KEKA.HT.Y.0004.000000T0000Z-230817T0600Z/ Del Norte Interior-Southwestern Humboldt- 604 AM PDT Mon Aug 14 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... * WHAT...Temperatures to 102. * WHERE...Del Norte Interior and Southwestern Humboldt Counties. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
859 WWUS76 KEKA 141748 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1048 AM PDT Mon Aug 14 2023 CAZ105-106-110-113-115-150200- /O.EXP.KEKA.HT.Y.0005.000000T0000Z-230814T1800Z/ /O.CON.KEKA.EH.W.0002.230814T1800Z-230817T0600Z/ Northern Humboldt Interior-Southern Humboldt Interior- Northwestern Mendocino Interior-Southeastern Mendocino Interior- Southern Lake- 1048 AM PDT Mon Aug 14 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... ...HEAT ADVISORY WILL EXPIRE AT 11 AM PDT THIS MORNING... * WHAT...Dangerously hot conditions with temperatures up to 107 expected. * WHERE...Northern Humboldt Interior, Southern Humboldt Interior, Northwestern Mendocino Interior, Southeastern Mendocino Interior and Southern Lake Counties. * WHEN...For the Excessive Heat Warning, from 11 AM this morning to 11 PM PDT Wednesday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ107-108-111-114-150200- /O.EXP.KEKA.HT.Y.0004.000000T0000Z-230814T1800Z/ /O.CON.KEKA.EH.W.0002.230814T1800Z-230817T0600Z/ Northern Trinity-Southern Trinity-Northeastern Mendocino Interior- Northern Lake- 1048 AM PDT Mon Aug 14 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... ...HEAT ADVISORY WILL EXPIRE AT 11 AM PDT THIS MORNING... * WHAT...Dangerously hot conditions with temperatures up to 106 expected. * WHERE...Northern Trinity, Southern Trinity, Northeastern Mendocino Interior and Northern Lake Counties. * WHEN...For the Excessive Heat Warning, from 11 AM this morning to 11 PM PDT Wednesday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ102-104-150200- /O.CON.KEKA.HT.Y.0004.000000T0000Z-230817T0600Z/ Del Norte Interior-Southwestern Humboldt- 1048 AM PDT Mon Aug 14 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... * WHAT...Temperatures to 102. * WHERE...Del Norte Interior and Southwestern Humboldt Counties. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
756 WWUS76 KEKA 142203 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 303 PM PDT Mon Aug 14 2023 CAZ105>108-110-111-113>115-150615- /O.CON.KEKA.EH.W.0002.000000T0000Z-230817T0600Z/ Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 303 PM PDT Mon Aug 14 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... * WHAT...Dangerously hot conditions with temperatures up to 105. * WHERE...Northern Humboldt Interior, Southern Humboldt Interior, Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Some local areas are seeing increased cloud cover. This is keeping temperature cooler than expected, but temperatures are expected to remain warm tonight, possibly in the 70s in some of the valleys. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ102-104-150615- /O.CON.KEKA.HT.Y.0004.000000T0000Z-230817T0600Z/ Del Norte Interior-Southwestern Humboldt- 303 PM PDT Mon Aug 14 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... * WHAT...Temperatures up to 102. * WHERE...Del Norte Interior and Southwestern Humboldt Counties. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
700 WWUS76 KEKA 150607 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1107 PM PDT Mon Aug 14 2023 CAZ105>108-110-111-113>115-151415- /O.CON.KEKA.EH.W.0002.000000T0000Z-230817T0600Z/ Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 1107 PM PDT Mon Aug 14 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... * WHAT...Dangerously hot conditions with temperatures up to 105. * WHERE...Northern Humboldt Interior, Southern Humboldt Interior, Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ102-104-151415- /O.CON.KEKA.HT.Y.0004.000000T0000Z-230817T0600Z/ Del Norte Interior-Southwestern Humboldt- 1107 PM PDT Mon Aug 14 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... * WHAT...Temperatures up to 102. * WHERE...Del Norte Interior and Southwestern Humboldt Counties. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
349 WWUS76 KEKA 151302 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 602 AM PDT Tue Aug 15 2023 CAZ105>108-110-111-113>115-152115- /O.CON.KEKA.EH.W.0002.000000T0000Z-230817T0600Z/ Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 602 AM PDT Tue Aug 15 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... * WHAT...Dangerously hot conditions with temperatures of 105 to 110. * WHERE...Northern Humboldt Interior, Southern Humboldt Interior, Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ102-104-152115- /O.CON.KEKA.HT.Y.0004.000000T0000Z-230817T0600Z/ Del Norte Interior-Southwestern Humboldt- 602 AM PDT Tue Aug 15 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... * WHAT...Temperatures to 100. * WHERE...Del Norte Interior and Southwestern Humboldt Counties. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
382 WWUS76 KEKA 152110 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 210 PM PDT Tue Aug 15 2023 CAZ105>108-110-111-113>115-160515- /O.CON.KEKA.EH.W.0002.000000T0000Z-230817T0600Z/ Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 210 PM PDT Tue Aug 15 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... * WHAT...Dangerously hot conditions with temperatures up to 105. * WHERE...Northern Humboldt Interior, Southern Humboldt Interior, Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ102-104-160515- /O.CON.KEKA.HT.Y.0004.000000T0000Z-230817T0600Z/ Del Norte Interior-Southwestern Humboldt- 210 PM PDT Tue Aug 15 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... * WHAT...Temperatures up to 100. * WHERE...Del Norte Interior and Southwestern Humboldt Counties. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
500 WWUS76 KEKA 160440 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 940 PM PDT Tue Aug 15 2023 CAZ105>108-110-111-113>115-161245- /O.CON.KEKA.EH.W.0002.000000T0000Z-230817T0600Z/ Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 940 PM PDT Tue Aug 15 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... * WHAT...Dangerously hot conditions with temperatures up to 110. * WHERE...Northern Humboldt Interior, Southern Humboldt Interior, Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ102-104-161245- /O.CON.KEKA.HT.Y.0004.000000T0000Z-230817T0600Z/ Del Norte Interior-Southwestern Humboldt- 940 PM PDT Tue Aug 15 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY... * WHAT...Temperatures up to 103. * WHERE...Del Norte Interior and Southwestern Humboldt Counties. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
842 WWUS76 KEKA 161031 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 331 AM PDT Wed Aug 16 2023 CAZ105>108-110-111-113>115-161845- /O.CON.KEKA.EH.W.0002.000000T0000Z-230817T0600Z/ Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 331 AM PDT Wed Aug 16 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING... * WHAT...Dangerously hot conditions with temperatures up to 108. * WHERE...Northern Humboldt Interior, Southern Humboldt Interior, Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...Until 11 PM PDT this evening. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ102-104-161845- /O.CON.KEKA.HT.Y.0004.000000T0000Z-230817T0600Z/ Del Norte Interior-Southwestern Humboldt- 331 AM PDT Wed Aug 16 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING... * WHAT...Temperatures up to 98. * WHERE...Del Norte Interior and Southwestern Humboldt Counties. * WHEN...Until 11 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
383 WWUS76 KEKA 161834 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1134 AM PDT Wed Aug 16 2023 CAZ105>108-110-111-113>115-170600- /O.CON.KEKA.EH.W.0002.000000T0000Z-230817T0600Z/ Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 1134 AM PDT Wed Aug 16 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 11 PM THIS EVENING... * WHAT...Dangerously hot conditions with temperatures up to 105. * WHERE...Northern Humboldt Interior, Southern Humboldt Interior, Trinity County, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Lake County. * WHEN...Until 11 PM this evening. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, schedule frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. $$ CAZ102-104-170600- /O.CON.KEKA.HT.Y.0004.000000T0000Z-230817T0600Z/ Del Norte Interior-Southwestern Humboldt- 1134 AM PDT Wed Aug 16 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 11 PM THIS EVENING... * WHAT...Temperatures up to 98. * WHERE...Del Norte Interior and Southwestern Humboldt Counties. * WHEN...Until 11 PM this evening. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, schedule frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. $$
751 WWUS76 KEKA 170600 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1100 PM PDT Wed Aug 16 2023 CAZ105>108-110-111-113>115-170700- /O.EXP.KEKA.EH.W.0002.000000T0000Z-230817T0600Z/ Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 1100 PM PDT Wed Aug 16 2023 ...EXCESSIVE HEAT WARNING WILL EXPIRE AT 11 PM PDT THIS EVENING... $$ CAZ102-104-170700- /O.EXP.KEKA.HT.Y.0004.000000T0000Z-230817T0600Z/ Del Norte Interior-Southwestern Humboldt- 1100 PM PDT Wed Aug 16 2023 ...HEAT ADVISORY WILL EXPIRE AT 11 PM PDT THIS EVENING... $$
What forecasters said that day
The local office's own words before this excessive heat warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Eureka, CA wrote its last area forecast discussion before this excessive heat warning went out at Aug 13, 5:41 AM PDT, 22 minutes earlier.
Area forecast discussion, Aug 13, 5:41 AM PDT, 22 minutes before
AREA FORECAST DISCUSSION
National Weather Service Eureka CA
541 AM PDT Sun Aug 13 2023
.SYNOPSIS...Above normal temperatures will continue into the middle
of the week. Isolated, mostly dry thunderstorms are possible
across portions of the interior early this week, with the best
chances tomorrow and Tuesday.
&&
.DISCUSSION...A cut-off upper low will linger off the Central and
Southern California Coast into this week, while an upper ridge
continues to build back over the Pacific Northwest. The building
ridge will bring a weak offshore wind component for Northwest
California. This will allow interior areas to heat up, with more
dry weather.
Lingering moisture from the former Tropical Storm Eugene along with
some sub-tropical monsoonal moisture will continue to spread north
into Northwest California through the middle of this week, but
mostly tomorrow and Tuesday. This, along with increasing surface
temperatures, will bring destabilization across the interior,
which will favor the development of interior mountain
thunderstorms each afternoon/evening today through Wednesday. Most
of these storms will be dry and high-based, although precipitable
water values will gradually increase by early next week. Storm
motion is expected to be slow through most of the period. The best
chance of thunderstorms now looks to be Monday afternoon and
evening, but storms could also form on Tuesday with some storms
even around on Wednesday. The best chance of wet thunderstorms is
expected on Monday and Tuesday.
A warming trend is forecast as the offshore ridge moves over the
area and continues to amplify into next week. Each afternoon today
through Wednesday, 850mb temperatures over Northern California
will approach 25C to 30C, this will make temperatures into the low
110s certainly possible for some interior regions of Northwest
California. But, generally, high temperatures are forecast to be
anywhere from 100 to 110. The hottest days are expected from
Monday to Wednesday. ECMWF Extreme Forecast Index (EFI)
highlights a high probability of above normal temperatures for
Northwest California for this time period, even including areas
along the North Coast with temperatures into the low to mid 70s
expected through the middle of the week.
Heat Advisories have been issued for Trinity, Lake, interior Del
Norte, interior Humboldt, and interior Mendocino counties starting
today. Excessive Heat Warnings have been issued for Trinity, Lake,
interior Humboldt, and interior Mendocino from Monday to Wednesday.
Heat Advisories will continue for Southwestern Humboldt and interior
Del Norte counties until Wednesday. Temperatures are expected to
remain above average into the middle of the week before decreasing
to more average values by the end of next week as a result of the
weakening upper level ridge. /JLW
&&
.AVIATION...Coastal stratus has gradually expanded and filled in around the
Humboldt Bay area overnight while clear skies have persisted farther
north. A few clouds are starting to appear on satellite near
Crescent City at this hour but generally east winds have prevailed
and clearer skies are expected along much of the Del Norte coast.
Through the day today southerly winds will develop along the
Humboldt/Del Norte coastlines and status should refill in this
afternoon or evening for all coastal areas. Inland areas will remain
VFR with a few cumulus forming over the interior mountains. /RPA
&&
.MARINE...North winds will continue to decrease today as the thermal trough
moves off the west coast and ridge builds. This will result in
gradually improving conditions and even light southerly winds in the
inner waters. Winds will remain light Monday into Tuesday across all
or most of the waters but some moderate fresh swell will propagate
into the waters potentially resulting in small craft conditions in
the outer waters through the period. North winds should increase
again beginning mid week. /RPA
&&
.FIRE WEATHER...Moisture will continue to move northward toward the
region into the new week. However, the latest models develop a
stronger ridge over N CA and S OR, and this will delay the bulk of
the moisture until tomorrow and Tuesday making the best chances
of thunderstorms on those days. The threat for fire starts due to
lightning will be further enhanced by another period of above
normal temperatures developing today and into next week. Will
continue to highlight this in the FWF headlines. The ECMWF model
is indicating an increased threat of lightning strikes Monday and
Tuesday, primarily focused over Lake, Trinity, and NE Mendocino
counties. We'll continue to monitor for the threat of more
lightning coverage. /SEC
&&
.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
Heat Advisory from 11 AM this morning to 11 PM PDT
Wednesday for CAZ102-104.
Heat Advisory from 11 AM this morning to 11 AM PDT Monday
for CAZ105>108-110-111-113>115.
Excessive Heat Warning from 11 AM Monday to 11 PM PDT
Wednesday for CAZ105>108-110-111-113>115.
NORTHWEST CALIFORNIA COASTAL WATERS...
Small Craft Advisory until 3 PM PDT this afternoon for
PZZ450.
Hazardous Seas Warning until 3 PM PDT this afternoon for
PZZ470.
Small Craft Advisory until 3 PM PDT Monday for PZZ475.
&&
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For forecast zone information
see the forecast zone map online:
https://www.weather.gov/images/eka/zonemap.pngThe office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 8:53 PM PDT | Hazardous Seas Warning | EKA | 18 hr | |
| Aug 13, 6:03 AM PDT | Heat Advisory | EKA | Humboldt, Mendocino | 29 hr |
Nearby
Excessive Heat Warnings in California, 2023Every excessive heat warning in 2023
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.