Alert archive / California / Red Flag Warnings in 2021
Red Flag Warning 10, NWS Reno, NV
NWS Reno, NV issued this red flag warning at Jul 3, 2021, 1:41 AM PDT for 7 counties in California; 5 counties in Nevada. It took effect at Jul 3, 2021, 11:00 PM PDT. It was in force for 7 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
- Jul 3, 2021, 1:41 AM PDT (08:41 UTC)
- In effect from
- Jul 3, 2021, 11:00 PM PDT
- Expired
- Jul 4, 2021, 6:22 AM PDT
- In force
- 7 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 08:38 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, 8.7 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
- 280 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 3236 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
406 WWUS85 KREV 030841 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 141 AM PDT Sat Jul 3 2021 CAZ270-278-NVZ420-458-041800- /O.UPG.KREV.FW.A.0009.210704T0800Z-210704T1800Z/ /O.NEW.KREV.FW.W.0010.210704T0600Z-210704T1800Z/ Surprise Valley California-Eastern Lassen County- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- Northern Washoe County- 141 AM PDT Sat Jul 3 2021 ...RED FLAG WARNING IN EFFECT FROM 11 PM THIS EVENING TO 11 AM PDT SUNDAY FOR THUNDERSTORMS AND STRONG OUTFLOW WINDS FOR PORTIONS OF WESTERN NEVADA AND NORTHEASTERN CALIFORNIA... The National Weather Service in Reno has issued a Red Flag Warning for thunderstorms and strong outflow winds, which is in effect from 11 PM this evening to 11 AM PDT Sunday. 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 and Fire Zone 458 Northern Washoe County. * Thunderstorms...Dry, fast-moving thunderstorms could form late this evening and sweep northward through Sunday morning. * Outflow Winds...Gusts to 40 mph will be possible. * Impacts...Little to no rainfall with these storms will promote a higher potential for multiple new fire starts from lightning, and may combine with strong outflow winds to cause a 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. && $$ CAZ271-272-NVZ421-041800- /O.UPG.KREV.FW.A.0009.210704T0600Z-210704T1500Z/ /O.NEW.KREV.FW.W.0010.210704T0600Z-210704T1800Z/ Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Greater Lake Tahoe and Truckee Area- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- 141 AM PDT Sat Jul 3 2021 ...RED FLAG WARNING IN EFFECT FROM 11 PM THIS EVENING TO 11 AM PDT SUNDAY FOR THUNDERSTORMS AND STRONG OUTFLOW WINDS FOR PORTIONS OF THE EASTERN SIERRA...WESTERN NEVADA...AND THE GREATER LAKE TAHOE AND TRUCKEE AREA... The National Weather Service in Reno has issued a Red Flag Warning for thunderstorms and strong outflow winds, which is in effect from 11 PM this evening to 11 AM PDT Sunday. The Fire Weather Watch is no longer in effect. * CHANGES...UPGRADED TO RED FLAG WARNING. * Affected Area...Fire Zone 271 Western Lassen, Eastern Plumas, and Eastern Sierra Counties, Fire Zone 272 Greater Lake Tahoe and Truckee Area, Fire Zone 421 Southern Sierra Front including Alpine, Northern Mono, Southern Lyon and Western Mineral Counties. * Thunderstorms...Dry, fast-moving thunderstorms could form late Saturday evening and sweep northward through Sunday morning. * Outflow Winds...Gusts to 40 mph will be possible. * Impacts...Little to no rainfall with these storms will promote a higher potential for multiple new fire starts from lightning, and may combine with strong outflow winds to cause a fire to rapidly grow in size and intensity before first responders can contain them. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ http://weather.gov/reno
2 follow-up statements
898 WWUS85 KREV 040918 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 218 AM PDT Sun Jul 4 2021 CAZ270>272-278-NVZ420-421-458-041800- /O.CON.KREV.FW.W.0010.000000T0000Z-210704T1800Z/ Surprise Valley California- Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Greater Lake Tahoe and Truckee Area-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-Northern Washoe County- 218 AM PDT Sun Jul 4 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 AM PDT THIS MORNING FOR THUNDERSTORMS AND STRONG OUTFLOW WINDS FOR PORTIONS OF WESTERN NEVADA AND NORTHEASTERN CALIFORNIA... * CHANGES...Updated wording. * Affected Area...Fire Zone 270 Surprise Valley California, Fire Zone 271 Western Lassen, Eastern Plumas, and Eastern Sierra Counties, Fire Zone 272 Greater Lake Tahoe and Truckee Area, 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 and Fire Zone 458 Northern Washoe County. * Thunderstorms...Dry, fast-moving thunderstorms will continue to develop and sweep northward through this morning. * Outflow Winds...Gusts to 40 mph will be possible. * Impacts...Little to no rainfall with these storms will promote a higher potential for multiple new fire starts from lightning, and may combine with strong outflow winds to cause a 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. && $$ http://weather.gov/reno
047 WWUS85 KREV 041322 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 622 AM PDT Sun Jul 4 2021 CAZ270>272-278-NVZ420-421-458-041430- /O.CAN.KREV.FW.W.0010.000000T0000Z-210704T1800Z/ Surprise Valley California- Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Greater Lake Tahoe and Truckee Area-Eastern Lassen County- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties-Northern Washoe County- 622 AM PDT Sun Jul 4 2021 ...RED FLAG WARNING IS CANCELLED FOR THUNDERSTORMS AND STRONG OUTFLOW WINDS FOR PORTIONS OF WESTERN NEVADA AND NORTHEASTERN CALIFORNIA... The National Weather Service in Reno has cancelled the Red Flag Warning. Lightning activity has decreased through the early morning hours with only some showers now moving through Lassen, Washoe, and Pershing counties. A lightning strike or two remains possible, but there is no longer enough coverage to support a Red Flag Warning. Expect wetter variety storms to form later today, as early as late morning, with potential for new fire starts from lightning that occurs outside of storm cores. $$ http://weather.gov/reno
The office that day
Everything else NWS Reno, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 3, 3:23 PM PDT | Special Weather Statement | REV | Sierra | 22 min |
| Jul 2, 5:41 PM PDT | Special Weather Statement | REV | 49 min | |
| Jul 2, 5:56 PM PDT | Areal Flood Advisory | REV | Washoe | 3 hr |
| Jul 3, 2:09 PM PDT | Special Weather Statement | REV | 36 min | |
| Jul 3, 4:23 PM PDT | Special Weather Statement | REV | 22 min |
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.