Alert archive / California / Red Flag Warnings in 2021
Red Flag Warning 16, NWS Reno, NV
NWS Reno, NV issued this red flag warning at Sep 9, 2021, 10:33 AM PDT for 6 counties in California. It took effect at Sep 9, 2021, 11:00 PM PDT. It was in force for 24 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
- Sep 9, 2021, 10:33 AM PDT (17:33 UTC)
- In effect from
- Sep 9, 2021, 11:00 PM PDT
- Expired
- Sep 10, 2021, 11:00 PM PDT
- In force
- 24 hr
- Issued by
- NWS Reno, NV
Counties El Dorado County, CA, Lassen County, CA, Nevada County, CA, Placer County, CA, Plumas County, CA, Sierra County, CA
The radar
The Beale AFB radar (KBBX), 84 km from the middle of the area, began a volume at 17:35 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, 5.6 hours before the alert went out and 211 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
- 3286 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
963 WWUS85 KREV 091733 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 1033 AM PDT Thu Sep 9 2021 CAZ271-272-278-101745- /O.UPG.KREV.FW.A.0015.210910T0600Z-210911T0600Z/ /O.NEW.KREV.FW.W.0016.210910T0600Z-210911T0600Z/ Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Greater Lake Tahoe and Truckee Area-Eastern Lassen County- 1033 AM PDT Thu Sep 9 2021 ...RED FLAG WARNING IN EFFECT FROM 11 PM THIS EVENING TO 11 PM PDT FRIDAY FOR THE TAHOE BASIN AND NORTHEAST CALIFORNIA FOR THUNDERSTORMS AND GUSTY WINDS AND LOW HUMIDITY TONIGHT AND FRIDAY... The National Weather Service in Reno has issued a Red Flag Warning for gusty winds and low humidity, which is in effect from 11 PM this evening to 11 PM PDT Friday. The Fire Weather Watch is no longer in effect.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. * Thunderstorms will move through the region tonight into Friday morning. Dry lightning strikes and gusty outflow winds are possible. There is potential for wetting rains in some of the stronger showers and thunderstorms. * Winds...Winds will increase through tonight especially in the higher terrain and over ridgelines. Expect southwest 15 to 25 mph with gusts to 35 mph tonight into Friday. Gusts may exceed 60 mph in the higher elevations around the Tahoe Basin. * Humidity...Minimum values of 15 to 25 percent Friday afternoon. * Impacts...Lightning can create new fire starts and may combine with gusty winds to cause a 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. && $$ http://weather.gov/reno
3 follow-up statements
420 WWUS85 KREV 102031 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 131 PM PDT Fri Sep 10 2021 CAZ271-272-278-110600- /O.CON.KREV.FW.W.0016.000000T0000Z-210911T0600Z/ Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Greater Lake Tahoe and Truckee Area-Eastern Lassen County- 131 PM PDT Fri Sep 10 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING FOR THE TAHOE BASIN AND NORTHEAST CALIFORNIA FOR THUNDERSTORMS AND GUSTY WINDS AND LOW HUMIDITY TONIGHT AND FRIDAY... * Changes....Removed thunderstorm threat. * Affected Area...Fire Zone 271 Western Lassen, Eastern Plumas, and Eastern Sierra Counties, Fire Zone 272 Greater Lake Tahoe and Truckee Area and Fire Zone 278 Eastern Lassen County. * Winds...Winds southwest 15 to 25 mph with gusts to 35 mph through this evening. Gusts may exceed 50 mph in the higher elevations around the Tahoe Basin. * Humidity...Minimum values of 15 to 25 percent. * Impacts...Gusty winds could cause a fire to rapidly grow in size and intensity. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ http://weather.gov/reno
800 WWUS85 KREV 102049 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 149 PM PDT Fri Sep 10 2021 CAZ271-272-278-110600- /O.CON.KREV.FW.W.0016.000000T0000Z-210911T0600Z/ Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Greater Lake Tahoe and Truckee Area-Eastern Lassen County- 149 PM PDT Fri Sep 10 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING FOR THE TAHOE BASIN AND NORTHEAST CALIFORNIA FOR GUSTY WINDS... * Changes....Removed thunderstorm threat. * 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...Winds southwest 15 to 25 mph with gusts to 35 mph through this evening. Gusts may exceed 50 mph in the higher elevations around the Tahoe Basin. * Humidity...Minimum values of 15 to 25 percent. * Impacts...Gusty winds could cause a 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. && $$ http://weather.gov/reno
208 WWUS85 KREV 110532 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 1032 PM PDT Fri Sep 10 2021 CAZ271-272-278-110645- /O.EXP.KREV.FW.W.0016.000000T0000Z-210911T0600Z/ Western Lassen, Eastern Plumas, and Eastern Sierra Counties- Greater Lake Tahoe and Truckee Area-Eastern Lassen County- 1032 PM PDT Fri Sep 10 2021 ...RED FLAG WARNING WILL EXPIRE AT 11 PM PDT THIS EVENING FOR THE TAHOE BASIN AND NORTHEAST CALIFORNIA FOR GUSTY WINDS... Winds have diminished well below critical levels and the threat for red flag conditions has ended. $$ http://weather.gov/reno
The office that day
Everything else NWS Reno, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 1:20 PM PDT | Lake Wind Advisory | REV | Alpine, El Dorado, Nevada, Placer | 31 hr |
Nearby
Red Flag Warnings in California, 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.