Alert archive / California / Red Flag Warnings in 2021
Red Flag Warning 15, NWS Reno, NV
NWS Reno, NV issued this red flag warning at Aug 29, 2021, 2:13 AM PDT for 5 counties in Nevada; 7 counties in California. It took effect at Aug 30, 2021, 2:00 PM PDT. It was in force for 57 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 29, 2021, 2:13 AM PDT (09:13 UTC)
- In effect from
- Aug 30, 2021, 2:00 PM PDT
- Expired
- Sep 1, 2021, 11:00 PM PDT
- In force
- 57 hr
- Issued by
- NWS Reno, NV
Counties El Dorado County, CA, Lassen County, CA, Modoc County, CA, Nevada County, CA, Placer County, CA, Plumas County, CA, Sierra County, CA, Douglas County, NV, Lyon County, NV, Mineral County, NV, Storey County, NV, Washoe County, NV
The radar
The Reno radar (KRGX), 56 km from the middle of the area, began a volume at 09:18 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
Reno, NV (KREV), launched 00:00Z, 9.2 hours before the alert went out and 162 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
- 3803 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
410 WWUS85 KREV 290913 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 213 AM PDT Sun Aug 29 2021 CAZ270-271-278-NVZ420-458-300915- /O.UPG.KREV.FW.A.0014.210830T2100Z-210901T0600Z/ /O.NEW.KREV.FW.W.0015.210830T2100Z-210901T0600Z/ Surprise Valley California- Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Eastern Lassen County- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- Northern Washoe County- 213 AM PDT Sun Aug 29 2021 ...RED FLAG WARNING IN EFFECT FROM 2 PM MONDAY TO 11 PM PDT TUESDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR THE EASTERN SIERRA AND WESTERN NEVADA... The National Weather Service in Reno has issued a Red Flag Warning for gusty winds and low humidity, which is in effect from 2 PM Monday to 11 PM PDT Tuesday. The Fire Weather Watch is no longer in effect. * Changes...Fire Weather Watch upgraded to Red Flag Warning. * Affected Area...Fire Zone 270 Surprise Valley California, Fire Zone 271 Western Lassen, Eastern Plumas, and Eastern Sierra Counties, 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 and Fire Zone 458 Northern Washoe County. * Winds...Southwest 15 to 20 mph with gusts to around 35 mph. Higher gusts possible in wind prone areas and along exposed terrain, even during the overnight period. * Humidity...Minimum values 5 to 10 percent. * Duration...3 to 6 hours Monday afternoon and then 3 to 6 hours Tuesday afternoon. Much longer durations are possible for exposed midslopes and ridges, even during the overnight period. * 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. && $$ CAZ272-NVZ421-300915- /O.UPG.KREV.FW.A.0014.210830T2100Z-210901T0600Z/ /O.NEW.KREV.FW.W.0015.210830T2100Z-210901T0600Z/ Greater Lake Tahoe and Truckee Area- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- 213 AM PDT Sun Aug 29 2021 ...RED FLAG WARNING IN EFFECT FROM 2 PM MONDAY TO 11 PM PDT TUESDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR THE EASTERN SIERRA AND WESTERN NEVADA... The National Weather Service in Reno has issued a Red Flag Warning for gusty winds and low humidity, which is in effect from 2 PM Monday to 11 PM PDT Tuesday. The Fire Weather Watch is no longer in effect. * Changes...Fire Weather Watch upgraded to Red Flag Warning. * Affected Area...Fire Zone 272 Greater Lake Tahoe and Truckee Area, Fire Zone 421 Southern Sierra Front including Alpine, Northern Mono, Southern Lyon and and Western Mineral Counties. * Winds...Southwest 15 to 20 mph with gusts to around 35 mph. Higher gusts possible in wind prone areas and along exposed terrain. Ridgetop winds may gust over 50 mph, even during the overnight period. * Humidity...Minimum values 10 to 20 percent. * Duration...3 to 6 hours Monday afternoon and then 3 to 6 hours Tuesday afternoon. Much longer durations are possible for exposed midslopes and ridges, even during the overnight period. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ http://weather.gov/reno
6 follow-up statements
812 WWUS85 KREV 292111 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 211 PM PDT Sun Aug 29 2021 CAZ270-271-278-NVZ420-458-311400- /O.CON.KREV.FW.W.0015.210830T2100Z-210901T0600Z/ Surprise Valley California- Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Eastern Lassen County- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- Northern Washoe County- 211 PM PDT Sun Aug 29 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 2 PM MONDAY TO 11 PM PDT TUESDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR THE EASTERN SIERRA AND WESTERN NEVADA... * Changes...None. * Affected Area...Fire Zone 270 Surprise Valley California, Fire Zone 271 Western Lassen, Eastern Plumas, and Eastern Sierra Counties, 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 and Fire Zone 458 Northern Washoe County. * Winds...Southwest 15 to 20 mph with gusts to around 35 mph. Higher gusts possible in wind prone areas and along exposed terrain, even during the overnight period. * Humidity...Minimum values 5 to 10 percent. * Duration...3 to 6 hours Monday afternoon and then 3 to 6 hours Tuesday afternoon. Much longer durations are possible for exposed midslopes and ridges, even during the overnight period. * 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. && $$ CAZ272-NVZ421-311400- /O.CON.KREV.FW.W.0015.210830T2100Z-210901T0600Z/ Greater Lake Tahoe and Truckee Area- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- 211 PM PDT Sun Aug 29 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 2 PM MONDAY TO 11 PM PDT TUESDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR THE EASTERN SIERRA AND WESTERN NEVADA... * Changes...None. * Affected Area...Fire Zone 272 Greater Lake Tahoe and Truckee Area, Fire Zone 421 Southern Sierra Front including Alpine, Northern Mono, Southern Lyon and and Western Mineral Counties. * Winds...Southwest 15 to 20 mph with gusts to around 35 mph. Higher gusts possible in wind prone areas and along exposed terrain. Ridgetop winds may gust over 50 mph, even during the overnight period. * Humidity...Minimum values 10 to 20 percent. * Duration...3 to 6 hours Monday afternoon and then 3 to 6 hours Tuesday afternoon. Much longer durations are possible for exposed midslopes and ridges, even during the overnight period. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ http://weather.gov/reno
289 WWUS85 KREV 301728 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 1028 AM PDT Mon Aug 30 2021 CAZ272-NVZ420-421-010000- /O.EXT.KREV.FW.W.0015.210830T2100Z-210902T0600Z/ Greater Lake Tahoe and Truckee Area- 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- 1028 AM PDT Mon Aug 30 2021 ...RED FLAG WARNING NOW IN EFFECT FROM 2 PM THIS AFTERNOON TO 11 PM PDT WEDNESDAY FOR UNSTABLE CONDITIONS, GUSTY WINDS, AND LOW HUMIDITY FOR THE EASTERN SIERRA AND WESTERN NEVADA... * Changes...Extended Red Flag Warning to 11 PM Wednesday. * Affected Area...Fire Zone 272 Greater Lake Tahoe and Truckee Area, 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 and Western Mineral Counties. * Winds...Southwest 10 to 20 mph with gusts to around 35 mph. Gusts may reach 40 mph in some locations Tuesday, especially along Highway 395. Winds gusts may exceed 50 mph over ridge lines in the Sierra late tonight and Tuesday. * Humidity...Minimum values 5 to 15 percent. * Duration...3 to 6 hours Monday and Tuesday afternoons. Winds will not subside much for exposed midslopes and ridges during the overnight periods. * Impacts...The combination of unstable conditions, gusty winds and low humidity can cause fire to rapidly grow in size and intensity. 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. && $$ CAZ270-271-278-NVZ458-010000- /O.CON.KREV.FW.W.0015.210830T2100Z-210901T0600Z/ Surprise Valley California- Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Eastern Lassen County-Northern Washoe County- 1028 AM PDT Mon Aug 30 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 11 PM PDT TUESDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR THE EASTERN SIERRA AND WESTERN NEVADA... * Changes...None. * Affected Area...Fire Zone 270 Surprise Valley California, Fire Zone 271 Western Lassen, Eastern Plumas, and Eastern Sierra Counties, Fire Zone 278 Eastern Lassen County and Fire Zone 458 Northern Washoe County. * Winds...Southwest 10 to 20 mph with gusts to around 35 mph. Higher gusts possible in wind prone areas and along exposed terrain, even during the overnight period. * Humidity...Minimum values 5 to 10 percent. * Duration...3 to 6 hours Monday and Tuesday afternoons. Much longer durations are possible for exposed midslopes and ridges, even during the overnight period. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ http://weather.gov/reno
747 WWUS85 KREV 311148 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 448 AM PDT Tue Aug 31 2021 CAZ270-271-278-NVZ458-010600- /O.CON.KREV.FW.W.0015.000000T0000Z-210901T0600Z/ Surprise Valley California- Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Eastern Lassen County-Northern Washoe County- 448 AM PDT Tue Aug 31 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR THE EASTERN SIERRA AND WESTERN NEVADA... * Changes...None. * Affected Area...Fire Zone 270 Surprise Valley California, Fire Zone 271 Western Lassen, Eastern Plumas, and Eastern Sierra Counties, Fire Zone 278 Eastern Lassen County and Fire Zone 458 Northern Washoe County. * Winds...Southwest 10 to 20 mph with gusts to around 35 mph. Higher gusts possible in wind prone areas and along exposed terrain, even during the overnight period. * Humidity...Minimum values 5 to 10 percent. * Duration...3 to 6 hours. Much longer durations are possible for exposed midslopes and ridges, even during the overnight period. * 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. && $$ CAZ272-NVZ420-421-011200- /O.CON.KREV.FW.W.0015.000000T0000Z-210902T0600Z/ Greater Lake Tahoe and Truckee Area- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- 448 AM PDT Tue Aug 31 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY FOR UNSTABLE CONDITIONS, GUSTY WINDS, AND LOW HUMIDITY FOR THE EASTERN SIERRA AND WESTERN NEVADA... * Changes...None. * Affected Area...Fire Zone 272 Greater Lake Tahoe and Truckee Area, Fire Zone 420 Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties, Fire Zone 421 Southern Sierra Front including Alpine, Northern Mono, Southern Lyon and and Western Mineral Counties. * Winds...Southwest 10 to 20 mph with gusts to around 35 mph. Gusts may reach 40 mph in some locations Tuesday, especially along Highway 395. Winds gusts may exceed 50 mph over ridge lines in the Sierra. * Humidity...Minimum values 5 to 15 percent. * Duration...3 to 6 hours Tuesday and Wednesday afternoons. Winds will not subside much for exposed midslopes and ridges during the overnight period tonight. * Impacts...The combination of unstable conditions, gusty winds and low humidity can cause fire to rapidly grow in size and intensity. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ http://weather.gov/reno
600 WWUS85 KREV 010551 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 1051 PM PDT Tue Aug 31 2021 CAZ270-271-278-NVZ458-010700- /O.EXP.KREV.FW.W.0015.000000T0000Z-210901T0600Z/ Surprise Valley California- Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Eastern Lassen County-Northern Washoe County- 1051 PM PDT Tue Aug 31 2021 ...RED FLAG WARNING WILL EXPIRE AT 11 PM PDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR NORTHEAST CALIFORNIA AND NORTHWEST NEVADA... This Red Flag will be allowed to expire at 11PM for the Surprise Valley, Western Lassen, Eastern Plumas, and Eastern Sierra Counties, Eastern Lassen County, and Northern Washoe County. Winds have decreased below critical criteria and will continue to diminish overnight. $$ CAZ272-NVZ420-421-020600- /O.CON.KREV.FW.W.0015.000000T0000Z-210902T0600Z/ Greater Lake Tahoe and Truckee Area- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- 1051 PM PDT Tue Aug 31 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT WEDNESDAY FOR UNSTABLE CONDITIONS, GUSTY WINDS, AND LOW HUMIDITY FOR THE EASTERN SIERRA AND WESTERN NEVADA... * Changes...None. * Affected Area...Fire Zone 272 Greater Lake Tahoe and Truckee Area, Fire Zone 420 Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties, Fire Zone 421 Southern Sierra Front including Alpine, Northern Mono, Southern Lyon and and Western Mineral Counties. * Winds...Southwest 10 to 20 mph with gusts to around 35 mph. Winds gusts may exceed 45 mph over ridge lines in the Sierra. * Humidity...Minimum values 5 to 15 percent. * Duration...3 to 6 hours Wednesday afternoons. Winds will not subside much for exposed midslopes and ridges during the overnight period tonight. * Impacts...The combination of unstable conditions, gusty winds and low humidity can cause fire to rapidly grow in size and intensity. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ http://weather.gov/reno
514 WWUS85 KREV 010957 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 257 AM PDT Wed Sep 1 2021 CAZ272-NVZ420-421-020600- /O.CON.KREV.FW.W.0015.000000T0000Z-210902T0600Z/ Greater Lake Tahoe and Truckee Area- 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- 257 AM PDT Wed Sep 1 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING FOR UNSTABLE CONDITIONS, GUSTY WINDS, AND LOW HUMIDITY FOR THE EASTERN SIERRA AND WESTERN NEVADA... * Changes...None. * Affected Area...Fire Zone 272 Greater Lake Tahoe and Truckee Area, 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 and Western Mineral Counties. * Winds...Southwest 10 to 20 mph with gusts to around 35 mph. Winds gusts may exceed 45 mph over ridge lines in the Sierra. * Humidity...Minimum values 5 to 15 percent. * Duration...3 to 6 hours Wednesday afternoon. Longer duration likely for exposed midslopes and ridges. * Impacts...The combination of unstable conditions, gusty winds and low humidity can cause fire to rapidly grow in size and intensity. 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. && $$ http://weather.gov/reno
992 WWUS85 KREV 020542 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 1042 PM PDT Wed Sep 1 2021 CAZ272-NVZ420-421-020645- /O.EXP.KREV.FW.W.0015.000000T0000Z-210902T0600Z/ Greater Lake Tahoe and Truckee Area- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- 1042 PM PDT Wed Sep 1 2021 ...RED FLAG WARNING WILL EXPIRE AT 11 PM PDT THIS EVENING FOR UNSTABLE CONDITIONS, GUSTY WINDS, AND LOW HUMIDITY FOR THE EASTERN SIERRA AND WESTERN NEVADA... Winds are still elevated for some locations across the Sierra and western Nevada late this evening. Ridge and foothill winds will decrease through Thursday morning. Winds become lighter Thursday and Friday, but dry air will remain across the region. $$ http://weather.gov/reno
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.