Alert archive / California / Red Flag Warnings in 2021
Red Flag Warning 12, NWS Reno, NV
NWS Reno, NV issued this red flag warning at Jul 17, 2021, 11:54 AM PDT for 9 counties in California; 5 counties in Nevada. It took effect at Jul 18, 2021, 11:00 AM PDT. It was in force for 16 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 17, 2021, 11:54 AM PDT (18:54 UTC)
- In effect from
- Jul 18, 2021, 11:00 AM PDT
- Expired
- Jul 19, 2021, 3:05 AM PDT
- In force
- 16 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, Douglas County, NV, Lyon County, NV, Mineral County, NV, Storey County, NV, Washoe County, NV
The radar
The Reno radar (KRGX), 64 km from the middle of the area, began a volume at 18:51 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 12:00Z, 6.9 hours before the alert went out and 155 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
- 3899 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
442 WWUS85 KREV 171854 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 1154 AM PDT Sat Jul 17 2021 CAZ274-NVZ421-182300- /O.UPG.KREV.FW.A.0011.210718T2100Z-210719T1500Z/ /O.NEW.KREV.FW.W.0012.210718T1800Z-210719T1800Z/ Southern Mono County- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- 1154 AM PDT Sat Jul 17 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM SUNDAY TO 11 AM PDT MONDAY FOR ABUNDANT LIGHTNING ON DRY FUELS FOR SOUTHERN SIERRA FRONT AND SOUTHERN MONO COUNTY... The National Weather Service in Reno has issued a Red Flag Warning for abundant lightning on dry fuels, which is in effect from 11 AM Sunday to 11 AM PDT Monday. The Fire Weather Watch is no longer in effect. * CHANGES...upgrade to Red Flag Warning. * Affected Area...Fire Zone 274 Southern Mono County, Fire Zone 421 Southern Sierra Front including Alpine, Northern Mono, Southern Lyon and and Western Mineral Counties. * Thunderstorms...Scattered mixed wet and dry thunderstorms late Sunday afternoon, then nocturnal storms Sunday night into Monday morning. Storms will become much wetter by Monday afternoon. * Outflow Winds...Gusts up to 40 mph possible. * Impacts...Recent hot and dry conditions have created very receptive vegetation for new lightning fires. New fire starts may combine with 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. && $$ CAZ270>272-278-NVZ420-458-182300- /O.UPG.KREV.FW.A.0011.210719T0700Z-210720T0700Z/ /O.NEW.KREV.FW.W.0012.210719T0700Z-210720T0300Z/ Surprise Valley California- Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Greater Lake Tahoe and Truckee Area-Eastern Lassen County- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- Northern Washoe County- 1154 AM PDT Sat Jul 17 2021 ...RED FLAG WARNING IN EFFECT FROM MIDNIGHT SUNDAY NIGHT TO 8 PM PDT MONDAY FOR ABUNDANT LIGHTNING ON DRY FUELS FOR NORTHERN SIERRA FRONT...TAHOE BASIN...AND NORTHEAST CALIFORNIA... The National Weather Service in Reno has issued a Red Flag Warning for abundant lightning on dry fuels, which is in effect from midnight Sunday night to 8 PM PDT Monday. The Fire Weather Watch is no longer in effect. * CHANGES...upgrade to Red Flag Warning. * Affected Area...Fire Zone 270 Surprise Valley California, Fire Zone 271 Western Lassen, Eastern Plumas, and Eastern Sierra Counties, Fire Zone 272 Greater Lake Tahoe and Truckee Area, Fire Zone 278 Eastern Lassen County, Fire Zone 420 Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties and Fire Zone 458 Northern Washoe County. * Thunderstorms...Isolated to scattered mixed wet and dry thunderstorms late Sunday night through Monday. * Outflow Winds...Gusts up to 40 mph possible. * Impacts...Recent hot and dry conditions have created very receptive vegetation to new lightning fires. New fire starts may combine with outflow winds to cause a fire to rapidly grow in size and intensity before first responders can contain them. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ Hoon http://weather.gov/reno
3 follow-up statements
461 WWUS85 KREV 182039 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 139 PM PDT Sun Jul 18 2021 CAZ274-NVZ421-190600- /O.EXT.KREV.FW.W.0012.000000T0000Z-210719T0600Z/ Southern Mono County- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- 139 PM PDT Sun Jul 18 2021 ...RED FLAG WARNING NOW IN EFFECT UNTIL 11 PM PDT THIS EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR SOUTHERN SIERRA FRONT AND SOUTHERN MONO COUNTY... * CHANGES...Changed the end time from 11 am Monday to 11 pm Sunday. * Affected Area...Fire Zone 274 Southern Mono County, Fire Zone 421 Southern Sierra Front including Alpine, Northern Mono, Southern Lyon and and Western Mineral Counties. * Thunderstorms...Isolated to scattered mixed wet and dry thunderstorms this afternoon into the evening. After an overnight break, storms will become much wetter by Monday afternoon. * Outflow Winds...Gusts up to 40 mph possible. * Impacts...Recent hot and dry conditions have created very receptive vegetation for new lightning fires. New fire starts may combine with 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. && $$ CAZ270>272-278-NVZ420-458-191800- /O.EXT.KREV.FW.W.0012.210719T0300Z-210719T1800Z/ 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- Northern Washoe County- 139 PM PDT Sun Jul 18 2021 ...RED FLAG WARNING NOW IN EFFECT FROM 8 PM THIS EVENING TO 11 AM PDT MONDAY FOR ABUNDANT LIGHTNING ON DRY FUELS FOR NORTHERN SIERRA FRONT...TAHOE BASIN...AND NORTHEAST CALIFORNIA... * CHANGES...Earlier start time by a few hours and also an earlier end time Monday morning instead of Monday evening. * 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 and Fire Zone 458 Northern Washoe County. * Thunderstorms...Isolated mixed wet and dry thunderstorms tonight through Monday morning. Additional storms are expected Monday afternoon but they will be much wetter. * Outflow Winds...Gusts up to 40 mph possible. * Impacts...Recent hot and dry conditions have created very receptive vegetation to new lightning fires. New fire starts may combine with outflow winds to cause a fire to rapidly grow in size and intensity before first responders can contain them. * Additional Info...Storms are anticipated this evening for the Tahoe Basin and northern Sierra Front, moving north into northeast California overnight. 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
673 WWUS85 KREV 190529 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 1029 PM PDT Sun Jul 18 2021 CAZ274-NVZ421-190630- /O.CAN.KREV.FW.W.0012.000000T0000Z-210719T0600Z/ Southern Mono County- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- 1029 PM PDT Sun Jul 18 2021 ...RED FLAG WARNING IS CANCELLED FOR ABUNDANT LIGHTNING ON DRY FUELS FOR SOUTHERN SIERRA FRONT AND SOUTHERN MONO COUNTY... The National Weather Service in Reno has cancelled the Red Flag Warning. Thunderstorms will remain isolated and the abundant lightning threat has ended. Storms Monday will be wetter and capable of heavy rainfall. $$ CAZ270>272-278-NVZ420-458-191800- /O.CON.KREV.FW.W.0012.000000T0000Z-210719T1800Z/ Surprise Valley California- Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Greater Lake Tahoe and Truckee Area-Eastern Lassen County- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- Northern Washoe County- 1029 PM PDT Sun Jul 18 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 AM PDT MONDAY FOR ABUNDANT LIGHTNING ON DRY FUELS FOR NORTHERN SIERRA FRONT...TAHOE BASIN...AND NORTHEAST CALIFORNIA... * CHANGES...None. * Affected Area...Fire Zone 270 Surprise Valley California, Fire Zone 271 Western Lassen, Eastern Plumas, and Eastern Sierra Counties, Fire Zone 272 Greater Lake Tahoe and Truckee Area, Fire Zone 278 Eastern Lassen County, Fire Zone 420 Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties and Fire Zone 458 Northern Washoe County. * Thunderstorms...Isolated mixed wet and dry thunderstorms tonight through Monday morning. Additional storms are expected Monday afternoon but they will be much wetter. * Outflow Winds...Gusts up to 40 mph possible. * Impacts...Recent hot and dry conditions have created very receptive vegetation to new lightning fires. New fire starts may combine with outflow winds to cause a fire to rapidly grow in size and intensity before first responders can contain them. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ http://weather.gov/reno
884 WWUS85 KREV 191005 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 305 AM PDT Mon Jul 19 2021 CAZ270>272-278-NVZ420-458-191115- /O.CAN.KREV.FW.W.0012.000000T0000Z-210719T1800Z/ 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- Northern Washoe County- 305 AM PDT Mon Jul 19 2021 ...RED FLAG WARNING IS CANCELLED FOR ABUNDANT LIGHTNING ON DRY FUELS FOR NORTHERN SIERRA FRONT...TAHOE BASIN...AND NORTHEAST CALIFORNIA... The National Weather Service in Reno has cancelled the Red Flag Warning. The threat for nocturnal/early morning storms has diminished and the Red Flag warnings have been cancelled as a result. Additional thunderstorms are expected later this afternoon; however, storms will become wetter and RH will increase as the main push of monsoon moistures arrives. $$ 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.