Alert archive / California / Red Flag Warnings in 2021
Red Flag Warning 14, NWS Reno, NV
NWS Reno, NV issued this red flag warning at Aug 16, 2021, 1:08 PM PDT for 7 counties in Nevada; 9 counties in California. It took effect at Aug 17, 2021, 11:00 AM PDT. It was in force for 11 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 16, 2021, 1:08 PM PDT (20:08 UTC)
- In effect from
- Aug 17, 2021, 11:00 AM PDT
- Expired
- Aug 17, 2021, 9:56 PM PDT
- In force
- 11 hr
- Issued by
- NWS Reno, NV
Counties El Dorado County, CA, Lassen County, CA, Madera County, CA, Modoc County, CA, Mono County, CA, Nevada County, CA, Placer County, CA, Plumas County, CA, Sierra County, CA, Churchill County, NV, Douglas County, NV, Lyon County, NV, Mineral County, NV, Pershing County, NV, Storey County, NV, Washoe County, NV
The radar
The Reno radar (KRGX), 46 km from the middle of the area, began a volume at 20:08 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, 8.1 hours before the alert went out and 282 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
- 1772 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -42 m²/s²
- 0-3 km storm-relative helicity
- 42 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
446 WWUS85 KREV 162008 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 108 PM PDT Mon Aug 16 2021 CAZ270-278-NVZ420-421-423-429-458-172015- /O.UPG.KREV.FW.A.0013.210817T2100Z-210818T0600Z/ /O.NEW.KREV.FW.W.0014.210817T1800Z-210818T0600Z/ Surprise Valley California-Eastern Lassen County- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- West Humboldt Basin in Pershing County- Lahontan Basin including Churchill and Eastern Mineral Counties- Northern Washoe County- 108 PM PDT Mon Aug 16 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 11 PM PDT TUESDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR NORTHEASTERN CALIFORNIA AND WESTERN NEVADA SIERRA FRONT AND EASTERN SIERRA... The National Weather Service in Reno has issued a Red Flag Warning for gusty winds and low humidity, which is in effect from 11 AM to 11 PM PDT Tuesday. The Fire Weather Watch is no longer in effect. * CHANGES...Upgraded to Red Flag Warning. * Affected Area...Fire Zone 270 Surprise Valley California, Fire Zone 278 Eastern Lassen County, Fire Zone 420 Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties, Fire Zone 421 Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties, Fire Zone 423 West Humboldt Basin in Pershing County, Fire Zone 429 Lahontan Basin including Churchill and Eastern Mineral Counties and Fire Zone 458 Northern Washoe County. * Winds...Southwest 15 to 25 mph with gusts to around 40 mph. Higher gusts possible in wind prone areas and along exposed terrain. * Humidity...Minimum values 5 to 15 percent. * Duration...3 to 7 hours for most locations. Up to 10 hours for exposed midslopes and ridges. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ CAZ271-172015- /O.UPG.KREV.FW.A.0013.210817T2100Z-210818T0600Z/ /O.NEW.KREV.FW.W.0014.210817T1800Z-210818T0600Z/ Western Lassen, Eastern Plumas, and Eastern Sierra Counties- 108 PM PDT Mon Aug 16 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 11 PM PDT TUESDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR THE NORTHEASTERN SIERRA... The National Weather Service in Reno has issued a Red Flag Warning for gusty winds and low humidity, which is in effect from 11 AM to 11 PM PDT Tuesday. The Fire Weather Watch is no longer in effect. * CHANGES...Upgrade to Red Flag Warning. * Affected Area...Fire Zone 271 Western Lassen, Eastern Plumas and and Eastern Sierra Counties. * Winds...Southwest 15 to 25 mph with gusts to around 40 mph. Higher gusts possible in wind prone areas and along exposed terrain. * Humidity...Minimum values 15 to 20 percent. * Duration...3 to 6 hours. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ CAZ274-172015- /O.NEW.KREV.FW.W.0014.210817T1800Z-210818T0600Z/ Southern Mono County- 108 PM PDT Mon Aug 16 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 11 PM PDT TUESDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR SOUTHERN MONO COUNTY... The National Weather Service in Reno has issued a Red Flag Warning for gusty winds and low humidity, which is in effect from 11 AM to 11 PM PDT Tuesday. * Affected Area...Fire Zone 274 Southern Mono County. * Winds...Southwest 15 to 25 mph with gusts to around 40 mph. Higher gusts possible in wind prone areas and along exposed terrain. * Humidity...Minimum values 5 to 15 percent. * Duration...3 to 7 hours for most locations. Up to 10 hours for exposed midslopes and ridges. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ CAZ272-172015- /O.NEW.KREV.FW.W.0014.210817T1800Z-210818T0600Z/ Greater Lake Tahoe and Truckee Area- 108 PM PDT Mon Aug 16 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 11 PM PDT TUESDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR GREATER LAKE TAHOE AND TRUCKEE AREA... The National Weather Service in Reno has issued a Red Flag Warning for gusty winds and low humidity, which is in effect from 11 AM to 11 PM PDT Tuesday. * Affected Area...Fire Zone 272 Greater Lake Tahoe and Truckee Area. * Winds...Southwest 15 to 25 mph with gusts to around 40 mph. Higher gusts possible in wind prone areas and along exposed terrain. * Humidity...Minimum values 15 to 20 percent. * Duration...3 to 6 hours. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ http://weather.gov/reno
2 follow-up statements
486 WWUS85 KREV 171019 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 319 AM PDT Tue Aug 17 2021 CAZ270-274-278-NVZ420-421-423-429-458-180600- /O.CON.KREV.FW.W.0014.210817T1800Z-210818T0600Z/ Surprise Valley California-Southern Mono County- Eastern Lassen County- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- West Humboldt Basin in Pershing County- Lahontan Basin including Churchill and Eastern Mineral Counties- Northern Washoe County- 319 AM PDT Tue Aug 17 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 11 PM PDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR NORTHEASTERN CALIFORNIA AND WESTERN NEVADA SIERRA FRONT AND EASTERN SIERRA... * CHANGES...None. * Affected Area...Fire Zone 270 Surprise Valley California, Fire Zone 274 Southern Mono County, Fire Zone 278 Eastern Lassen County, Fire Zone 420 Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties, Fire Zone 421 Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties, Fire Zone 423 West Humboldt Basin in Pershing County, Fire Zone 429 Lahontan Basin including Churchill and Eastern Mineral Counties and Fire Zone 458 Northern Washoe County. * Winds...Southwest 15 to 25 mph with gusts to around 40 mph. Higher gusts possible in wind prone areas and along exposed terrain. * Humidity...Minimum values 5 to 15 percent. * Duration...3 to 7 hours for most locations. Up to 10 hours for exposed midslopes and ridges. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ CAZ271-272-180600- /O.CON.KREV.FW.W.0014.210817T1800Z-210818T0600Z/ Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Greater Lake Tahoe and Truckee Area- 319 AM PDT Tue Aug 17 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 11 PM PDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR GREATER LAKE TAHOE AND TRUCKEE AREA... * Changes...None. * Affected Area...Fire Zone 271 Western Lassen, Eastern Plumas, and Eastern Sierra Counties and Fire Zone 272 Greater Lake Tahoe and Truckee Area. * Winds...Southwest 15 to 25 mph with gusts to around 40 mph. Higher gusts possible in wind prone areas and along exposed terrain. * Humidity...Minimum values 15 to 20 percent. * Duration...3 to 6 hours. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ http://weather.gov/reno
249 WWUS85 KREV 180456 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 956 PM PDT Tue Aug 17 2021 CAZ270>272-274-278-NVZ420-421-423-429-458-180600- /O.CAN.KREV.FW.W.0014.000000T0000Z-210818T0600Z/ Surprise Valley California- Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Greater Lake Tahoe and Truckee Area-Southern Mono County- Eastern Lassen County- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- West Humboldt Basin in Pershing County- Lahontan Basin including Churchill and Eastern Mineral Counties- Northern Washoe County- 956 PM PDT Tue Aug 17 2021 ...RED FLAG WARNING IS CANCELLED FOR GUSTY WINDS AND LOW HUMIDITY FOR NORTHEASTERN CALIFORNIA AND WESTERN NEVADA SIERRA FRONT AND EASTERN SIERRA... Winds and humidity have decreased below Red Flag Criteria. A cold front however will continue to drop south tonight with an expected wind shift out of the north-northeast through Wednesday. $$ http://weather.gov/reno
The office that day
Everything else NWS Reno, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 3:24 PM PDT | Lake Wind Advisory | REV | Churchill, Douglas, Lyon, Mineral, Pershing, Storey and 1 more | 31 hr |
Nearby
Red Flag Warnings in California, 2021Red Flag Warnings in Nevada, 2021Every red flag warning 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.