Alert archive / California / Red Flag Warnings in 2021
Red Flag Warning 13, NWS Reno, NV
NWS Reno, NV issued this red flag warning at Aug 4, 2021, 3:30 AM PDT for 9 counties in California; 7 counties in Nevada. It took effect at Aug 5, 2021, 12:00 AM PDT. It was in force for 22 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 4, 2021, 3:30 AM PDT (10:30 UTC)
- In effect from
- Aug 5, 2021, 12:00 AM PDT
- Expired
- Aug 5, 2021, 9:53 PM PDT
- In force
- 22 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 10:29 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, 10.5 hours before the alert went out and 137 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
- 80 J/kg
- Mixed-layer CIN
- -58 J/kg
- Mixed-layer LCL
- 3976 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
007 WWUS85 KREV 041030 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 330 AM PDT Wed Aug 4 2021 CAZ271-272-278-052300- /O.UPG.KREV.FW.A.0012.210805T0700Z-210806T0500Z/ /O.NEW.KREV.FW.W.0013.210805T0700Z-210806T0500Z/ Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Greater Lake Tahoe and Truckee Area-Eastern Lassen County- 330 AM PDT Wed Aug 4 2021 ...RED FLAG WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 10 PM PDT THURSDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR THE NORTHERN SIERRA, NORTHEAST CALIFORNIA AND GREATER LAKE TAHOE TRUCKEE AREAS... The National Weather Service in Reno has issued a Red Flag Warning for gusty winds and low humidity, which is in effect from midnight tonight to 10 PM PDT Thursday. 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 Eastern Sierra Counties, Fire Zone 272 Greater Lake Tahoe and Truckee Area and Fire Zone 278 Eastern Lassen County. * Winds...Southwest 15 to 20 mph with gusts 30 to 40 mph. Higher gusts likely in wind prone areas and along exposed terrain. * Humidity...Minimum values of 5 to 15 percent. * Duration...5 to 8 hours for most areas. Up to 10 hours along 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. && $$ CAZ270-274-NVZ420-421-423-429-458-052300- /O.UPG.KREV.FW.A.0012.210805T1700Z-210806T0500Z/ /O.NEW.KREV.FW.W.0013.210805T1700Z-210806T0500Z/ Surprise Valley California-Southern Mono 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- 330 AM PDT Wed Aug 4 2021 ...RED FLAG WARNING IN EFFECT FROM 10 AM TO 10 PM PDT THURSDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR THE SIERRA FRONT, WESTERN NEVADA, 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 10 AM to 10 PM PDT Thursday. The Fire Weather Watch is no longer in effect. * Changes...Upgrade to Red Flag Warning. * Affected Area...Fire Zone 270 Surprise Valley California, Fire Zone 274 Southern Mono 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 20 mph with gusts 30 to 40 mph. Higher gusts likely in wind prone areas and along exposed terrain. * Humidity...Minimum values of 5 to 15 percent. * Duration...6 to 9 hours for most areas. Up to 12 hours along 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. && $$ http://weather.gov/reno
1 follow-up statement
084 WWUS85 KREV 060453 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 953 PM PDT Thu Aug 5 2021 CAZ270>272-274-278-NVZ420-421-423-429-458-060600- /O.CAN.KREV.FW.W.0013.000000T0000Z-210806T0500Z/ 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- 953 PM PDT Thu Aug 5 2021 ...RED FLAG WARNING IS CANCELLED FOR GUSTY WINDS AND LOW HUMIDITY FOR THE SIERRA FRONT, WESTERN NEVADA, AND EASTERN SIERRA... The National Weather Service in Reno has cancelled the Red Flag Warning. Wind speeds have fallen below critical levels and will continue to decrease overnight and thus the Red Flag Warning has been cancelled. However, humidities will remain very dry tonight and breezy conditions will continue for several more hours, especially at wind prone locations. $$ 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 4, 3:22 PM PDT | Lake Wind Advisory | REV | Alpine, El Dorado, Lassen, Mono, Nevada, Placer and 2 more | 30 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.