Alert archive / California / Heat Advisories in 2021
Heat Advisory 7, NWS Eureka, CA
NWS Eureka, CA issued this heat advisory at Aug 10, 2021, 5:16 AM PDT for 4 counties in California. It took effect at Aug 11, 2021, 1:00 PM PDT. It was in force for 25 hr.
The area
The counties it named.
The facts
- Issued
- Aug 10, 2021, 5:16 AM PDT (12:16 UTC)
- In effect from
- Aug 11, 2021, 1:00 PM PDT
- Expired
- Aug 12, 2021, 2:21 PM PDT
- In force
- 25 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 12:19 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, 0.3 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
- 1964 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
352 WWUS76 KEKA 101216 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 516 AM PDT Tue Aug 10 2021 CAZ105-107-108-110-111-113>115-102230- /O.UPG.KEKA.EH.A.0005.210811T2000Z-210813T0000Z/ /O.NEW.KEKA.HT.Y.0007.210811T2000Z-210813T0000Z/ Northern Humboldt Interior-Northern Trinity-Southern Trinity- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southeastern Mendocino Interior-Northern Lake-Southern Lake- 516 AM PDT Tue Aug 10 2021 ...HEAT ADVISORY IN EFFECT FROM 1 PM WEDNESDAY TO 5 PM THURSDAY... * WHAT...High temperatures up to 105 expected. * WHERE...Northern Humboldt Interior, Trinity County, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, and Lake County. * WHEN...From 1 PM Wednesday to 5 PM Thursday. * 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. $$
7 follow-up statements
367 WWUS76 KEKA 102145 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 245 PM PDT Tue Aug 10 2021 CAZ105-107-108-110-111-113>115-110545- /O.CON.KEKA.HT.Y.0007.210811T2000Z-210813T0000Z/ Northern Humboldt Interior-Northern Trinity-Southern Trinity- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southeastern Mendocino Interior-Northern Lake-Southern Lake- 245 PM PDT Tue Aug 10 2021 ...HEAT ADVISORY REMAINS IN EFFECT FROM 1 PM WEDNESDAY TO 5 PM PDT THURSDAY... * WHAT...Temperatures up to 105 expected. * WHERE...Southern Trinity, Southeastern Mendocino Interior, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Humboldt Interior, Northern Trinity, Southern Lake and Northern Lake Counties. * WHEN...From 1 PM Wednesday to 5 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
554 WWUS76 KEKA 110418 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 918 PM PDT Tue Aug 10 2021 CAZ105-107-108-110-111-113>115-111230- /O.CON.KEKA.HT.Y.0007.210811T2000Z-210813T0000Z/ Northern Humboldt Interior-Northern Trinity-Southern Trinity- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southeastern Mendocino Interior-Northern Lake-Southern Lake- 918 PM PDT Tue Aug 10 2021 ...HEAT ADVISORY REMAINS IN EFFECT FROM 1 PM WEDNESDAY TO 5 PM PDT THURSDAY... * WHAT...Temperatures up to 108 expected. * WHERE...Northern Humboldt Interior, Trinity County, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Southeastern Mendocino Interior, and Lake County. * WHEN...From 1 PM Wednesday to 5 PM PDT Thursday. * 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. && $$
950 WWUS76 KEKA 111216 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 516 AM PDT Wed Aug 11 2021 CAZ105-107-108-110-111-113>115-112230- /O.CON.KEKA.HT.Y.0007.210811T2000Z-210813T0000Z/ Northern Humboldt Interior-Northern Trinity-Southern Trinity- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Southeastern Mendocino Interior-Northern Lake-Southern Lake- 516 AM PDT Wed Aug 11 2021 ...HEAT ADVISORY REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO 5 PM THURSDAY... * WHAT...Temperatures up to 105 expected. * WHERE...Trinity County, Southeastern Mendocino Interior, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Humboldt Interior, and Lake County. * WHEN...From 1 PM this afternoon to 5 PM Thursday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, schedule frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. $$
308 WWUS76 KEKA 112142 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 242 PM PDT Wed Aug 11 2021 CAZ105-112245- /O.CAN.KEKA.HT.Y.0007.000000T0000Z-210813T0000Z/ Northern Humboldt Interior- 242 PM PDT Wed Aug 11 2021 ...HEAT ADVISORY IS CANCELLED... Heavy smoke in the area is tending to limit daytime heating by several degrees, while still allowing temperatures to cool off at night. $$ CAZ107-108-110-111-113>115-120545- /O.CON.KEKA.HT.Y.0007.000000T0000Z-210813T0000Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 242 PM PDT Wed Aug 11 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 5 PM PDT THURSDAY... * WHAT...High temperatures up to 105 expected in the hotter valleys. Low temperatures in valleys mainly in the upper 50s and low 60s. Staying warmer at night over the mountains. * WHERE...Southern Trinity, Southeastern Mendocino Interior, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake, Southern Lake and Northern Trinity Counties. * WHEN...Until 5 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
371 WWUS76 KEKA 120346 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 846 PM PDT Wed Aug 11 2021 CAZ107-108-110-111-113>115-121200- /O.CON.KEKA.HT.Y.0007.000000T0000Z-210813T0000Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 846 PM PDT Wed Aug 11 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 5 PM PDT THURSDAY... * WHAT...High temperatures up to 105 expected in the hotter valleys. Low temperatures in valleys mainly in the upper 50s and low 60s. Staying warmer at night over the mountains. * WHERE...Southern Trinity, Southeastern Mendocino Interior, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake, Southern Lake and Northern Trinity Counties. * WHEN...Until 5 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses to occur. * ADDITIONAL DETAILS...Areas seeing heavy smoke may see cooler than expected temperatures. 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. && $$
391 WWUS76 KEKA 121145 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 445 AM PDT Thu Aug 12 2021 CAZ107-108-110-111-113>115-122300- /O.CON.KEKA.HT.Y.0007.000000T0000Z-210813T0000Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 445 AM PDT Thu Aug 12 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 5 PM PDT THIS AFTERNOON... * WHAT...Temperatures up to 105. * WHERE...Southern Trinity, Southeastern Mendocino Interior, Northwestern Mendocino Interior, Northeastern Mendocino Interior, Northern Lake, Southern Lake and Northern Trinity Counties. * WHEN...Until 5 PM PDT this afternoon. * IMPACTS...Hot temperatures may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
073 WWUS76 KEKA 122121 NPWEKA URGENT - WEATHER MESSAGE National Weather Service Eureka CA 221 PM PDT Thu Aug 12 2021 CAZ107-108-110-111-113>115-122230- /O.CAN.KEKA.HT.Y.0007.000000T0000Z-210813T0000Z/ Northern Trinity-Southern Trinity-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southeastern Mendocino Interior- Northern Lake-Southern Lake- 221 PM PDT Thu Aug 12 2021 ...HEAT ADVISORY IS CANCELLED... Due to areas of smoke and haze, at least aloft, limiting sunshine and daytime heating, temperatures this afternoon are running a solid 5 to 10 degrees cooler than Wednesday. While portions of Lake County will be in the upper 90s to near 100, the overall heat risk is lower than earlier anticipated. $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 2:50 AM PDT | Small Craft Advisory | EKA | 24 hr |
Nearby
Heat Advisories in California, 2021Every heat advisory in 2021
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.