Alert archive / California / Heat Advisories in 2023
Heat Advisory 2, NWS Eureka, CA
NWS Eureka, CA issued this heat advisory at Jul 12, 2023, 1:43 PM PDT for Humboldt County, California. It took effect at Jul 15, 2023, 11:00 AM PDT. It was in force for 34 hr.
The area
The counties it named.
The facts
- Issued
- Jul 12, 2023, 1:43 PM PDT (20:43 UTC)
- In effect from
- Jul 15, 2023, 11:00 AM PDT
- Expired
- Jul 16, 2023, 9:00 PM PDT
- In force
- 34 hr
- Issued by
- NWS Eureka, CA
County Humboldt County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 39 km from the middle of the area, began a volume at 20:42 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
Medford/Jackson, OR (KMFR), launched 12:00Z, 8.7 hours before the alert went out and 207 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
- 1462 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 143 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
356 WWUS76 KEKA 122043 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 143 PM PDT Wed Jul 12 2023 CAZ107-108-110-111-113>115-130445- /O.UPG.KEKA.EH.A.0002.230714T1800Z-230717T0300Z/ /O.NEW.KEKA.EH.W.0001.230715T1800Z-230717T0400Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 143 PM PDT Wed Jul 12 2023 ...EXCESSIVE HEAT WARNING IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Dangerously hot conditions with temperatures of 105 to 112 expected. * WHERE...Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * 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. && $$ CAZ105-130445- /O.NEW.KEKA.HT.Y.0002.230715T1800Z-230717T0400Z/ Northern Humboldt Interior- 143 PM PDT Wed Jul 12 2023 ...HEAT ADVISORY IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Temperatures of 100 to 106 expected. * WHERE...Northern Humboldt Interior County. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
12 follow-up statements
325 WWUS76 KEKA 130432 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 932 PM PDT Wed Jul 12 2023 CAZ107-108-110-111-113>115-131245- /O.CON.KEKA.EH.W.0001.230715T1800Z-230717T0400Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 932 PM PDT Wed Jul 12 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Dangerously hot conditions with temperatures of 105 to 112 expected. * WHERE...Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * 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. && $$ CAZ105-131245- /O.CON.KEKA.HT.Y.0002.230715T1800Z-230717T0400Z/ Northern Humboldt Interior- 932 PM PDT Wed Jul 12 2023 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Temperatures of 100 to 106 expected. * WHERE...Northern Humboldt Interior County. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
282 WWUS76 KEKA 130907 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 207 AM PDT Thu Jul 13 2023 CAZ107-108-110-111-113>115-131715- /O.CON.KEKA.EH.W.0001.230715T1800Z-230717T0400Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 207 AM PDT Thu Jul 13 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Dangerously hot conditions with temperatures up to 109 expected. * WHERE...Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * 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. && $$ CAZ105-131715- /O.CON.KEKA.HT.Y.0002.230715T1800Z-230717T0400Z/ Northern Humboldt Interior- 207 AM PDT Thu Jul 13 2023 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Temperatures up to 104 expected. * WHERE...Northern Humboldt Interior County. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
457 WWUS76 KEKA 131756 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1056 AM PDT Thu Jul 13 2023 CAZ107-108-110-111-113>115-140200- /O.CON.KEKA.EH.W.0001.230715T1800Z-230717T0400Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 1056 AM PDT Thu Jul 13 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Dangerously hot conditions with temperatures up to 110 expected. * WHERE...Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * 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. && $$ CAZ105-140200- /O.CON.KEKA.HT.Y.0002.230715T1800Z-230717T0400Z/ Northern Humboldt Interior- 1056 AM PDT Thu Jul 13 2023 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Temperatures up to 105 expected. * WHERE...Northern Humboldt Interior County. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
299 WWUS76 KEKA 132138 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 238 PM PDT Thu Jul 13 2023 CAZ107-108-110-111-113>115-140945- /O.CON.KEKA.EH.W.0001.230715T1800Z-230717T0400Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 238 PM PDT Thu Jul 13 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Dangerously hot conditions with temperatures up to 109 expected. * WHERE...Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * 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. && $$ CAZ105-140945- /O.CON.KEKA.HT.Y.0002.230715T1800Z-230717T0400Z/ Northern Humboldt Interior- 238 PM PDT Thu Jul 13 2023 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Temperatures up to 105 expected. * WHERE...Northern Humboldt Interior County. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
045 WWUS76 KEKA 140932 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 232 AM PDT Fri Jul 14 2023 CAZ107-108-110-111-113>115-141745- /O.CON.KEKA.EH.W.0001.230715T1800Z-230717T0400Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 232 AM PDT Fri Jul 14 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Dangerously hot conditions with temperatures up to 112 expected. * WHERE...Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * 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. && $$ CAZ105-141745- /O.CON.KEKA.HT.Y.0002.230715T1800Z-230717T0400Z/ Northern Humboldt Interior- 232 AM PDT Fri Jul 14 2023 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Temperatures up to 105 expected. * WHERE...Northern Humboldt Interior County. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
299 WWUS76 KEKA 141745 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1045 AM PDT Fri Jul 14 2023 CAZ107-108-110-111-113>115-150145- /O.CON.KEKA.EH.W.0001.230715T1800Z-230717T0400Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 1045 AM PDT Fri Jul 14 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Dangerously hot conditions with temperatures up to 112 expected. * WHERE...Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * 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. && $$ CAZ105-150145- /O.CON.KEKA.HT.Y.0002.230715T1800Z-230717T0400Z/ Northern Humboldt Interior- 1045 AM PDT Fri Jul 14 2023 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Temperatures up to 105 expected. * WHERE...Northern Humboldt Interior County. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
673 WWUS76 KEKA 142144 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 244 PM PDT Fri Jul 14 2023 CAZ107-108-110-111-113>115-150945- /O.CON.KEKA.EH.W.0001.230715T1800Z-230717T0400Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 244 PM PDT Fri Jul 14 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Dangerously hot conditions with temperatures up to 109 expected. * WHERE...Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * 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. && $$ CAZ105-150945- /O.CON.KEKA.HT.Y.0002.230715T1800Z-230717T0400Z/ Northern Humboldt Interior- 244 PM PDT Fri Jul 14 2023 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM PDT SUNDAY... * WHAT...Temperatures up to 104 expected. * WHERE...Northern Humboldt Interior County. * WHEN...From 11 AM Saturday to 9 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
508 WWUS76 KEKA 150935 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 235 AM PDT Sat Jul 15 2023 CAZ107-108-110-111-113>115-151745- /O.CON.KEKA.EH.W.0001.230715T1800Z-230717T0400Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 235 AM PDT Sat Jul 15 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 9 PM PDT SUNDAY... * WHAT...Dangerously hot conditions with temperatures up to 112 expected. * WHERE...Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 11 AM this morning to 9 PM PDT Sunday. * 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. && $$ CAZ105-151745- /O.CON.KEKA.HT.Y.0002.230715T1800Z-230717T0400Z/ Northern Humboldt Interior- 235 AM PDT Sat Jul 15 2023 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 9 PM PDT SUNDAY... * WHAT...Temperatures up to 104 expected. * WHERE...Northern Humboldt Interior County. * WHEN...From 11 AM this morning to 9 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
621 WWUS76 KEKA 151733 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1033 AM PDT Sat Jul 15 2023 CAZ107-108-110-111-113>115-161745- /O.CON.KEKA.EH.W.0001.230715T1800Z-230717T0400Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 1033 AM PDT Sat Jul 15 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM PDT SUNDAY... * WHAT...Dangerously hot conditions with temperatures up to 112 expected. * WHERE...Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...From 11 AM this morning to 9 PM PDT Sunday. * 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. && $$ CAZ105-161745- /O.CON.KEKA.HT.Y.0002.230715T1800Z-230717T0400Z/ Northern Humboldt Interior- 1033 AM PDT Sat Jul 15 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM PDT SUNDAY... * WHAT...Temperatures up to 104 expected. * WHERE...Northern Humboldt Interior County. * WHEN...From 11 AM this morning to 9 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
017 WWUS76 KEKA 161520 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 820 AM PDT Sun Jul 16 2023 CAZ107-108-110-111-113>115-162330- /O.CON.KEKA.EH.W.0001.000000T0000Z-230717T0400Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 820 AM PDT Sun Jul 16 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM PDT THIS EVENING... * WHAT...Dangerously hot conditions with temperatures up to 108. * WHERE...Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...Until 9 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. && $$ CAZ105-162330- /O.CON.KEKA.HT.Y.0002.000000T0000Z-230717T0400Z/ Northern Humboldt Interior- 820 AM PDT Sun Jul 16 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM PDT THIS EVENING... * WHAT...Temperatures up to 99. * WHERE...Northern Humboldt Interior County. * WHEN...Until 9 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
846 WWUS76 KEKA 162106 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 206 PM PDT Sun Jul 16 2023 CAZ107-108-110-111-113>115-170400- /O.CON.KEKA.EH.W.0001.000000T0000Z-230717T0400Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 206 PM PDT Sun Jul 16 2023 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM PDT THIS EVENING... * WHAT...Dangerously hot conditions with temperatures up to 107. * WHERE...Northern Trinity, Southern Trinity, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake and Southern Lake Counties. * WHEN...Until 9 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. && $$ CAZ105-170400- /O.CON.KEKA.HT.Y.0002.000000T0000Z-230717T0400Z/ Northern Humboldt Interior- 206 PM PDT Sun Jul 16 2023 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM PDT THIS EVENING... * WHAT...Temperatures up to 98. * WHERE...Northern Humboldt Interior County. * WHEN...Until 9 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
280 WWUS76 KEKA 170345 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 845 PM PDT Sun Jul 16 2023 CAZ107-108-110-111-113>115-170445- /O.EXP.KEKA.EH.W.0001.000000T0000Z-230717T0400Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 845 PM PDT Sun Jul 16 2023 ...EXCESSIVE HEAT WARNING WILL EXPIRE AT 9 PM PDT THIS EVENING... $$ CAZ105-170445- /O.EXP.KEKA.HT.Y.0002.000000T0000Z-230717T0400Z/ Northern Humboldt Interior- 845 PM PDT Sun Jul 16 2023 ...HEAT ADVISORY WILL EXPIRE AT 9 PM PDT THIS EVENING... $$
What forecasters said that day
The local office's own words before this heat advisory 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 heat advisory went out at Jul 12, 4:14 AM PDT, 9 hours 29 minutes earlier.
Area forecast discussion, Jul 12, 4:14 AM PDT, 9 hours 29 minutes before
AREA FORECAST DISCUSSION
National Weather Service Eureka CA
414 AM PDT Wed Jul 12 2023
.SYNOPSIS...Seasonable weather conditions will trend toward very
hot and dry this weekend across interior valleys, with afternoon
temperatures ranging from 100 to 110 across much of Trinity, Lake,
and interior Mendocino County. Elsewhere, periods of stratus will
continue to impact the coast, though afternoon clearing will be
possible on a daily basis. Otherwise, no rain is forecast to
occur during the next seven days.
&&
.DISCUSSION...Multi-model guidance shows quasi-zonal flow aloft
transitioning to ridging over the West Coast during the second
half of the week. Significant deep-layer warming and drying will
occur as a result, with interior valley high temperatures ranging
from 100 to 110 across much of Trinity, Lake and central/eastern
Mendocino County this Saturday and Sunday. Reference the
excessive heat watch for impacts associated with the impending
heat wave. Otherwise, a typical early summer marine boundary layer
evolution will occur in the vicinity of the coast, resulting in
nocturnal marine stratus development followed by periods of
erosion during the afternoon.
Garner
&&
.AVIATION...Early morning profiler data and satellite imagery
shows a similar to slightly deeper marine layer to Tuesday morning
with a depth of around 2000 ft. Stratus blankets the N Coast
along with the adjacent coastal waters. Ceiling heights range from
around 500-700 ft. So far, no significant visibility obstructions
were noted, but some MVFR visibilities are possible around
daybreak. GFS LAMP guidance indicates the best chance of
scattering of the stratus deck later today is from 23Z-03Z at KCEC
and 22Z-04Z at KACV. This is later than what occurred on Tuesday
at KCEC, but similar to what KACV experienced. Winds along the N
Coast will be generally light.
Coastal stratus is quite a bit farther W than this time yesterday
across Mendocino County, well W of KUKI. Additionally, clouds to
the S at KSTS are showing no signs of advection northward up the
Russian River Valley. As a result, VFR conditions are expected to
continue there through the next 24 hours. Winds at KUKI will be
generally light, but a few gusts over 15 knots are possible again
late this afternoon and early this evening. /SEC
&&
.MARINE...Northerly winds will persist through the period. Winds
will be strongest S of Cape Mendocino through Thursday, then
spread N with widespread strong to near gale conditions over all
of the outer waters late in the week. Steep seas will develop in
response to winds with seas over 10 feet in the outer waters by
the weekend. The Small Craft Advisory for the S waters continues
thru 3 PM this afternoon. Another advisory will likely be needed
by Thursday night, with more significant headlines possible by
Saturday. /SEC
&&
.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
Excessive Heat Watch from Friday morning through Sunday
evening for CAZ107-108-110-111-113>115.
NORTHWEST CALIFORNIA COASTAL WATERS...
Small Craft Advisory until 3 PM PDT this afternoon for
PZZ455-475.
&&
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For forecast zone information
see the forecast zone map online:
https://www.weather.gov/images/eka/zonemap.pngHazardous weather outlook, Jul 12, 3:13 AM PDT, 10 hours 30 minutes before
Hazardous Weather Outlook National Weather Service Eureka CA 313 AM PDT Wed Jul 12 2023 CAZ101>106-109-112-131015- Coastal Del Norte-Del Norte Interior-Northern Humboldt Coast- Southwestern Humboldt-Northern Humboldt Interior- Southern Humboldt Interior-Mendocino Coast- Southwestern Mendocino Interior- 313 AM PDT Wed Jul 12 2023 This hazardous weather outlook is for northwest California. .DAY ONE...Today and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. Note: The text-only Hazardous Weather Outlook from NWS Eureka will be discontinued on August 1st, 2023. A Graphical Hazardous Weather Outlook is now available at: https://www.weather.gov/erh/ghwo?wfo=eka CAZ107-108-110-111-113>115-131015- Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 313 AM PDT Wed Jul 12 2023 ...EXCESSIVE HEAT WATCH IN EFFECT FROM FRIDAY MORNING THROUGH SUNDAY EVENING... This hazardous weather outlook is for northwest California. .DAY ONE...Today and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. A Excessive Heat Watch is currently in effect. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. Note: The text-only Hazardous Weather Outlook from NWS Eureka will be discontinued on August 1st, 2023. A Graphical Hazardous Weather Outlook is now available at: https://www.weather.gov/erh/ghwo?wfo=eka
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 1:43 PM PDT | Excessive Heat Warning | EKA | Lake, Mendocino, Trinity | 4 days |
| Jul 12, 2:39 PM PDT | Small Craft Advisory | EKA | 12 days |
Nearby
Heat Advisories in California, 2023Every heat advisory 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.