Alert archive / California / Excessive Heat Warnings in 2020
Excessive Heat Warning 1, NWS Eureka, CA
NWS Eureka, CA issued this excessive heat warning at Aug 13, 2020, 11:23 AM PDT for Lake County, Mendocino County, California. It took effect at Aug 14, 2020, 12:00 PM PDT. It was in force for 31 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, 2020, 11:23 AM PDT (18:23 UTC)
- In effect from
- Aug 14, 2020, 12:00 PM PDT
- Expired
- Aug 15, 2020, 7:00 PM PDT
- In force
- 31 hr
- Issued by
- NWS Eureka, CA
Counties Lake County, CA, Mendocino County, CA
The radar
The Beale AFB radar (KBBX), 128 km from the middle of the area, began a volume at 18:25 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, 6.4 hours before the alert went out and 188 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
- 2689 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 124 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
322 WWUS76 KEKA 131823 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1123 AM PDT Thu Aug 13 2020 CAZ110>115-140230- /O.UPG.KEKA.EH.A.0002.200814T1900Z-200816T0200Z/ /O.NEW.KEKA.EH.W.0001.200814T1900Z-200816T0200Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake County-Southern Lake County- 1123 AM PDT Thu Aug 13 2020 ...EXCESSIVE HEAT WARNING IN EFFECT FROM NOON FRIDAY TO 7 PM PDT SATURDAY... * WHAT...Dangerously hot conditions with afternoon temperatures between 100 and 110 degrees...and low temperatures in the mid 60s to low 70s. * WHERE...Much of Lake County and interior Mendocino County. * WHEN...From noon Friday to 7 PM PDT Saturday. * IMPACTS...High heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Friday and Saturday will likely be only the first two days of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. 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. && $$ CAZ102-104>108-140230- /O.UPG.KEKA.EH.A.0002.200815T1700Z-200816T0200Z/ /O.NEW.KEKA.HT.Y.0005.200814T1900Z-200816T0200Z/ Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity- 1123 AM PDT Thu Aug 13 2020 ...HEAT ADVISORY IN EFFECT FROM NOON FRIDAY TO 7 PM PDT SATURDAY... * WHAT...Dangerously hot afternoon conditions with maximum temperatures between 100 and 110 degrees...with relief from overnight temperatures in the upper 50s to mid 60s. * WHERE...Trinity County, and interior Del Norte and Humboldt Counties. * WHEN...From noon Friday to 7 PM PDT Saturday. * IMPACTS...Hot afternoon conditions may cause heat illnesses to occur. * ADDITIONAL DETAILS...Friday and Saturday will likely be only the first two days of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
7 follow-up statements
298 WWUS76 KEKA 140020 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 520 PM PDT Thu Aug 13 2020 CAZ110>115-140830- /O.CON.KEKA.EH.W.0001.200814T1900Z-200816T0200Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake County-Southern Lake County- 520 PM PDT Thu Aug 13 2020 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM NOON FRIDAY TO 7 PM PDT SATURDAY... * WHAT...Dangerously hot conditions with afternoon temperatures between 100 and 110 degrees...and low temperatures in the mid 60s to low 70s. * WHERE...Much of Lake County and interior Mendocino County. * WHEN...From noon Friday to 7 PM PDT Saturday. * IMPACTS...High heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Friday and Saturday will likely be only the first two days of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. 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. && $$ CAZ102-104>108-140830- /O.CON.KEKA.HT.Y.0005.200814T1900Z-200816T0200Z/ Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity- 520 PM PDT Thu Aug 13 2020 ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON FRIDAY TO 7 PM PDT SATURDAY... * WHAT...Dangerously hot afternoon conditions with maximum temperatures between 100 and 110 degrees...with relief from overnight temperatures in the upper 50s to mid 60s. * WHERE...Trinity County, and interior Del Norte and Humboldt Counties. * WHEN...From noon Friday to 7 PM PDT Saturday. * IMPACTS...Hot afternoon conditions may cause heat illnesses to occur. * ADDITIONAL DETAILS...Friday and Saturday will likely be only the first two days of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
814 WWUS76 KEKA 140602 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1102 PM PDT Thu Aug 13 2020 CAZ110>115-141415- /O.CON.KEKA.EH.W.0001.200814T1900Z-200816T0200Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake County-Southern Lake County- 1102 PM PDT Thu Aug 13 2020 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM NOON FRIDAY TO 7 PM PDT SATURDAY... * WHAT...Dangerously hot conditions with afternoon temperatures between 100 and 110 degrees...and low temperatures in the mid 60s to low 70s. * WHERE...Much of Lake County and interior Mendocino County. * WHEN...From noon Friday to 7 PM PDT Saturday. * IMPACTS...High heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Friday and Saturday will likely be only the first two days of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. 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. && $$ CAZ102-104>108-141415- /O.CON.KEKA.HT.Y.0005.200814T1900Z-200816T0200Z/ Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity- 1102 PM PDT Thu Aug 13 2020 ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON FRIDAY TO 7 PM PDT SATURDAY... * WHAT...Dangerously hot afternoon conditions with maximum temperatures between 100 and 110 degrees...with relief from overnight temperatures in the upper 50s to mid 60s. * WHERE...Trinity County, and interior Del Norte and Humboldt Counties. * WHEN...From noon Friday to 7 PM PDT Saturday. * IMPACTS...Hot afternoon conditions may cause heat illnesses to occur. * ADDITIONAL DETAILS...Friday and Saturday will likely be only the first two days of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
356 WWUS76 KEKA 141217 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 517 AM PDT Fri Aug 14 2020 CAZ110>115-142100- /O.CON.KEKA.EH.W.0001.200814T1900Z-200816T0200Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake County-Southern Lake County- 517 AM PDT Fri Aug 14 2020 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM NOON TODAY TO 7 PM PDT SATURDAY... * WHAT...Dangerously hot conditions with afternoon temperatures between 100 and 110 degrees...and low temperatures in the mid 60s to low 70s. * WHERE...Much of Lake County and interior Mendocino County. * WHEN...From noon Friday to 7 PM PDT Saturday. * IMPACTS...High heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Friday and Saturday will likely be only the first two days of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. 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. && $$ CAZ102-104>108-142100- /O.CON.KEKA.HT.Y.0005.200814T1900Z-200816T0200Z/ Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity- 517 AM PDT Fri Aug 14 2020 ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 7 PM PDT SATURDAY... * WHAT...Dangerously hot afternoon conditions with maximum temperatures between 100 and 110 degrees...with relief from overnight temperatures in the upper 50s to mid 60s. * WHERE...Trinity County, and interior Del Norte and Humboldt Counties. * WHEN...From noon Friday to 7 PM PDT Saturday. * IMPACTS...Hot afternoon conditions may cause heat illnesses to occur. * ADDITIONAL DETAILS...Friday and Saturday will likely be only the first two days of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
301 WWUS76 KEKA 150540 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 1040 PM PDT Fri Aug 14 2020 CAZ110>115-151300- /O.CON.KEKA.EH.W.0001.000000T0000Z-200816T0200Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake County-Southern Lake County- 1040 PM PDT Fri Aug 14 2020 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 7 PM PDT SATURDAY... * WHAT...Dangerously hot conditions with afternoon temperatures between 100 and 110 degrees...and low temperatures in the mid 60s to low 70s. * WHERE...Much of Lake County and interior Mendocino County. * WHEN...From noon Friday to 7 PM PDT Saturday. * IMPACTS...High heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Saturday will be the second day of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. 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. && $$ CAZ102-104>108-151300- /O.CON.KEKA.HT.Y.0005.000000T0000Z-200816T0200Z/ Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity- 1040 PM PDT Fri Aug 14 2020 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM PDT SATURDAY... * WHAT...Dangerously hot afternoon conditions with maximum temperatures between 100 and 110 degrees...with relief from overnight temperatures in the upper 50s to mid 60s. * WHERE...Trinity County, and interior Del Norte and Humboldt Counties. * WHEN...From noon Friday to 7 PM PDT Saturday. * IMPACTS...Hot afternoon conditions may cause heat illnesses to occur. * ADDITIONAL DETAILS...Saturday will be the second day of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
169 WWUS76 KEKA 151052 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 352 AM PDT Sat Aug 15 2020 CAZ110>115-160200- /O.CON.KEKA.EH.W.0001.000000T0000Z-200816T0200Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southwestern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake County-Southern Lake County- 352 AM PDT Sat Aug 15 2020 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 7 PM PDT THIS EVENING... * WHAT...Dangerously hot conditions with afternoon temperatures between 100 and 110 degrees...and low temperatures in the mid 60s to low 70s. * WHERE...Much of Lake County and interior Mendocino County. * WHEN...Until 7 PM PDT Saturday. * IMPACTS...High heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Saturday will be the second day of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. 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. && $$ CAZ102-104>108-160200- /O.CON.KEKA.HT.Y.0005.000000T0000Z-200816T0200Z/ Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity- 352 AM PDT Sat Aug 15 2020 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM PDT THIS EVENING... * WHAT...Dangerously hot afternoon conditions with maximum temperatures between 100 and 110 degrees...with relief from overnight temperatures in the upper 50s to mid 60s. * WHERE...Trinity County, and interior Del Norte and Humboldt Counties. * WHEN...Until 7 PM PDT Saturday. * IMPACTS...Hot afternoon conditions may cause heat illnesses to occur. * ADDITIONAL DETAILS...Saturday will be the second day of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
136 WWUS76 KEKA 152224 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 324 PM PDT Sat Aug 15 2020 CAZ110-111-113>115-160630- /O.EXB.KEKA.HT.Y.0005.200816T0200Z-200817T0300Z/ /O.CON.KEKA.EH.W.0001.000000T0000Z-200816T0200Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southeastern Mendocino Interior-Northern Lake County- Southern Lake County- 324 PM PDT Sat Aug 15 2020 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 7 PM PDT THIS EVENING... ...HEAT ADVISORY IN EFFECT FROM 7 PM THIS EVENING TO 8 PM PDT SUNDAY... * WHAT...Dangerously hot afternoon conditions with maximum temperatures between 100 and 110 degrees this afternoon...with relief from overnight temperatures in the upper 50s to mid 60s. Highs will be several degrees lower on Sunday, with highs in the upper 90s to mid 100s. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Northern Lake County and Southern Lake County Counties. * WHEN...For the Excessive Heat Warning, until 7 PM PDT this evening. For the Heat Advisory, from 7 PM this evening to 8 PM PDT Sunday. * IMPACTS...Hot afternoon conditions may cause heat illnesses to occur. * ADDITIONAL DETAILS...Saturday will be the second day of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. 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. && $$ CAZ112-160200- /O.CON.KEKA.EH.W.0001.000000T0000Z-200816T0200Z/ Southwestern Mendocino Interior- 324 PM PDT Sat Aug 15 2020 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 7 PM PDT THIS EVENING... * WHAT...Dangerously hot conditions with afternoon temperatures between 100 and 110 degrees...and low temperatures in the mid 60s to low 70s. * WHERE...Much of Lake County and interior Mendocino County. * WHEN...Until 7 PM PDT Saturday. * IMPACTS...High heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Saturday will be the second day of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ102-104>108-160200- /O.CON.KEKA.HT.Y.0005.000000T0000Z-200816T0200Z/ Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity- 324 PM PDT Sat Aug 15 2020 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM PDT THIS EVENING... * WHAT...Dangerously hot afternoon conditions with maximum temperatures between 100 and 110 degrees...with relief from overnight temperatures in the upper 50s to mid 60s. * WHERE...Trinity County, and interior Del Norte and Humboldt Counties. * WHEN...Until 7 PM PDT Saturday. * IMPACTS...Hot afternoon conditions may cause heat illnesses to occur. * ADDITIONAL DETAILS...Saturday will be the second day of an extended heatwave that may last for much of the next week. Some minor cooling may take place Sunday, but residents can expect prolonged above average temperatures for several days. 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. && $$
959 WWUS76 KEKA 160206 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 706 PM PDT Sat Aug 15 2020 CAZ110-111-113>115-161015- /O.EXP.KEKA.EH.W.0001.000000T0000Z-200816T0200Z/ /O.CON.KEKA.HT.Y.0005.000000T0000Z-200817T0300Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southeastern Mendocino Interior-Northern Lake County- Southern Lake County- 706 PM PDT Sat Aug 15 2020 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT SUNDAY... * WHAT...Maximum afternoon temperatures in the upper 90s to low 100s, with overnight lows in the 60s. * WHERE...Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, Lake County. * WHEN...Until 8 PM PDT Sunday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS...Residents can expect prolonged above average temperatures for several days. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ CAZ112-160315- /O.EXP.KEKA.EH.W.0001.000000T0000Z-200816T0200Z/ Southwestern Mendocino Interior- 706 PM PDT Sat Aug 15 2020 ...EXCESSIVE HEAT WARNING HAS EXPIRED... Some minor cooling is expected for Sunday, but residents can expect prolonged above average temperatures for the next several days. $$ CAZ102-104>108-160315- /O.EXP.KEKA.HT.Y.0005.000000T0000Z-200816T0200Z/ Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Northern Trinity-Southern Trinity- 706 PM PDT Sat Aug 15 2020 ...HEAT ADVISORY WILL EXPIRE AT 7 PM PDT THIS EVENING... Some minor cooling is expected for Sunday, but residents can expect prolonged above average temperatures for the next several days. $$
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, 4:30 AM PDT, 6 hours 53 minutes earlier.
Area forecast discussion, Aug 13, 4:30 AM PDT, 6 hours 53 minutes before
AREA FORECAST DISCUSSION
National Weather Service Eureka CA
430 AM PDT Thu Aug 13 2020
.SYNOPSIS...Dry and near average conditions will persist again
today, with mild conditions near the coast. Hot conditions are
expected Friday and Saturday, with mountain thunderstorms possible
Saturday. Hot and dry conditions are expected to continue into
next week, although the coast is expected to see a return of the
marine layer.
&&
.DISCUSSION...High pressure aloft and weak offshore flow are
bringing mostly clear skies and dry conditions to the region this
morning. There is an area of upper level low pressure developing
off the southern CA coast. This producing some lightning over the
ocean off Point Conception. There are a few small patches of low
clouds on the Humboldt coast, but these should mix out quickly
this morning. The marine layer is only around 1,500 feet deep on
the profiler. Inland temperatures will generally top out in the
upper 90s to around 100 or a few degrees warmer than yesterday.
Tonight offshore flow is expected to increase slightly. Easterly
winds at 925mb and the surface may push some smoke towards the
coast in northern Humboldt and southern Del Norte counties. The
HRRR smoke model also shows this. This offshore is expected to
keep the marine clouds away.
Friday winds will become south to southeast as the upper level
low starts to approach the waters from the south. The lightning
associated with this low will need to be watched. There is a small
chance this could move up to our area Friday night. At this point
it is not expected, but will need to be watched. At the same time
temperatures aloft continue to warm bringing very hot conditions
across the interior. Many valley locations will see temperatures
between 100 and 105. The offshore flow is expected to bring some
of this heat out to the coast with highs in the low 70s possible,
although confidence is low on this. This offshore flow is expected
to keep the coast mainly clear again Friday night. It is possible
that it may push some smoke out towards the coast again, the flow
looks fairly similar. Friday night the southeast winds will be
fairly light, but may keep temperatures warmer than usual in the
interior areas. Confidence is low on this, so went below NBM
guidance, but lows are still in the upper 50's to low 60s in the
valleys. The excessive heat watch looks on track for Friday. It
may need to be expanded north into Trinity county as well interior
Del Norte and Humboldt counties.
Saturday the forecast starts to get more tricky. The upper level
low off the southern CA coast continues to move closer to the area
bringing moisture with it. The NAM shows thunderstorms developing
in NE Mendocino county and portions of the Trinity county. Deep
shear is around 20 to 25 KT and cape is around 500 to 800 j/kg of
ML Cape. Models are struggling with exactly how much moisture it
will advect north into our area. The NAM appears to be on the
wetter side of the SREF ensembles while the GFS may not have
enough moisture for storms to develop. For now it looks like
storms will be isolated in nature. One of the biggest questions is
whether there will be a shortwave moving around the low and how
strong it will be. This could bring more or less coverage of
storms. The amount of moisture this brings will also impact high
temperatures. If there is enough clouds it could limit the heat
slightly, but the heat watch looks on track in general.
Sunday there may be some more clouds around and temperatures will
be a few degrees cooler than on Saturday. However many areas will
likely continue to see temperatures around 100 degrees. At the
coast the southerly flow from the low will likely start to bring
some stratus north to the coastal areas. It is expected to be
limited to the immediate coast. Winds will increase over the
ridges as well.
Early next week high pressure is expected to build back in and
continue to bring hot temperatures to the inland areas. Additional
heat products may be needed. At this point it looks like the coast
will remain seasonably cool with the marine layer in place,
although likely quite shallow. MKK
&&
.AVIATION...By 2AM, only a small patch of stratus directly over
KACV generating LIFR Cigs was observed. Clear skies and VFR
conditions prevailed elsewhere. The layer is being monitored for
expansion and eventual advection to KCEC in the dawn hours by
localized southerly flow. However, this scenario is looking less
likely. Effective clearing to VFR is expected from late morning to
midday. The pattern may not be favorable for widespread coastal
stratus formation through Friday, though very shallow areas of
stratus or fog may form under the building high pressure and
inversion.
&&
.MARINE...Northerly winds and steep seas will increase in the
outer waters today as high pressure builds in. An approaching area
of low pressure will act to break down the high over our waters,
weakening the pressure gradient. The trend in model guidance has
been an acceleration of this process, with a sharp gradient of the
stronger winds pushing westward out of the waters overnight
Friday, potentially sooner than expected. However, the steep seas
will remain and will be slower to subside. There is still some
uncertainty in the exact details. Southerly winds will then
develop over the waters on Saturday, and then continuing through
the weekend.
&&
.FIRE WEATHER...Low RH and warm temperatures are expected again
today, although winds are expected to be fairly light and terrain
driven. Tonight recoveries are expected to be poor on the ridges
and only moderate in the valleys. Light easterly winds may push
smoke from the Red-Salmon complex out towards the coast. Friday
will see warmer temperatures with most valley locations right
around 100 and even the coastal areas may warm into the 70s. RH is
expected to be in the teens again in the interior valleys. An
isolated thunderstorm is possible in Trinity county Friday
afternoon, but confidence is too low to add it to the forecast at
this point. Friday night recoveries are expected to be poor
again on the ridges and moderate in the valleys. Temperatures are
expected to stay warm with many areas remaining in the 60s.
Saturday there is the threat for thunderstorms. Current models are
showing the biggest threat over Trinity county and NE Mendocino
county. Currently am only expecting coverage to be isolated, but a
small change in the strength of the shortwave rotating around the
low could increase the coverage. Rainfall is expected to be fairly
light and with the decent storm movement there is a fairly high
potential for fire starts.
The threat for fire starts will increased by continued hot and dry
conditions on Sunday. South to southwest winds of 10 to 15 mph are
expected Sunday afternoon with local gusts to 25 mph on the
ridges. Min RH will increase slightly and is expected to be in
the teens to 20s. Monday and Tuesday high pressure will continue
to bring hot temperatures but winds are expected to be as strong.
MKK
&&
.EKA WATCHES/WARNINGS/ADVISORIES...
CA...Excessive Heat Watch from Saturday morning through Saturday
evening for CAZ102-104>108.
Excessive Heat Watch from Friday afternoon through Saturday
evening for CAZ110>115.
NORTHWEST CALIFORNIA COASTAL WATERS...
Small Craft Advisory until 5 PM PDT this afternoon for PZZ470.
Hazardous Seas Warning from 5 PM this afternoon to noon PDT
Friday for PZZ470.
Small Craft Advisory until 9 AM PDT Saturday for PZZ475.
&&
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https://www.weather.gov/images/eka/zonemap.pngHazardous weather outlook, Aug 13, 4:37 AM PDT, 6 hours 46 minutes before
Hazardous Weather Outlook National Weather Service Eureka CA 437 AM PDT Thu Aug 13 2020 CAZ101-103-109-141145- Coastal Del Norte-Northern Humboldt Coast-Mendocino Coast- 437 AM PDT Thu Aug 13 2020 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...Friday through Wednesday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. CAZ102-105>108-141145- Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior-Northern Trinity-Southern Trinity- 437 AM PDT Thu Aug 13 2020 ...EXCESSIVE HEAT WATCH IN EFFECT FROM SATURDAY MORNING THROUGH SATURDAY EVENING... This hazardous weather outlook is for northwest California. .DAY ONE...Today and tonight. No hazardous weather is expected through tonight. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. A Excessive Heat Watch is currently in effect. Afternoon temperatures are expected to warm to between 100 and 105 degrees Friday through the weekend, and potentially into early next week. A slight chance of thunderstorms exists Saturday afternoon. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. CAZ111-114-141145- Northeastern Mendocino Interior-Northern Lake County- 437 AM PDT Thu Aug 13 2020 ...EXCESSIVE HEAT WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH SATURDAY EVENING... This hazardous weather outlook is for northwest California. .DAY ONE...Today and tonight. No hazardous weather is expected through tonight. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. A Excessive Heat Watch is currently in effect. Afternoon temperatures are expected to warm to between 100 and 105 degrees Friday through the weekend, and potentially into early next week. A slight chance of thunderstorms exists Saturday afternoon. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. CAZ110-112-113-115-141145- Northwestern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior-Southern Lake County- 437 AM PDT Thu Aug 13 2020 ...EXCESSIVE HEAT WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH SATURDAY EVENING... This hazardous weather outlook is for northwest California. .DAY ONE...Today and tonight. No hazardous weather is expected through tonight. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. A Excessive Heat Watch is currently in effect. Afternoon temperatures are expected to warm to between 95 and 105 degrees Friday through the weekend, and potentially into early next week. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. CAZ104-141145- Southwestern Humboldt- 437 AM PDT Thu Aug 13 2020 ...EXCESSIVE HEAT WATCH IN EFFECT FROM SATURDAY MORNING THROUGH SATURDAY EVENING... This hazardous weather outlook is for northwest California. .DAY ONE...Today and tonight. No hazardous weather is expected through tonight. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. A Excessive Heat Watch is currently in effect. Afternoon temperatures are expected to warm to between 95 and 105 degrees Friday through the weekend, and potentially into early next week. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 11:23 AM PDT | Heat Advisory | EKA | Del Norte, Humboldt, Lake, Mendocino, Trinity | 3 days |
Nearby
Excessive Heat Warnings in California, 2020Every excessive heat warning in 2020
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.