Alert archive / Nevada / Red Flag Warnings in 2021
Red Flag Warning 17, NWS Reno, NV
NWS Reno, NV issued this red flag warning at Sep 17, 2021, 11:35 AM PDT for 7 counties in Nevada; Lassen County, Modoc County, California. It took effect at Sep 18, 2021, 1:00 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
- Sep 17, 2021, 11:35 AM PDT (18:35 UTC)
- In effect from
- Sep 18, 2021, 1:00 PM PDT
- Expired
- Sep 18, 2021, 8:00 PM PDT
- In force
- 7 hr
- Issued by
- NWS Reno, NV
Counties Lassen County, CA, Modoc 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), 15 km from the middle of the area, began a volume at 18:38 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 12:00Z, 6.6 hours before the alert went out and 107 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
- 2639 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- -7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
927 WWUS85 KREV 171835 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 1135 AM PDT Fri Sep 17 2021 NVZ429-182300- /O.UPG.KREV.FW.A.0016.210918T2000Z-210919T0300Z/ /O.NEW.KREV.FW.W.0017.210918T2000Z-210919T0300Z/ /O.CON.KREV.FW.A.0017.210919T1900Z-210920T0300Z/ Lahontan Basin including Churchill and Eastern Mineral Counties- 1135 AM PDT Fri Sep 17 2021 ...RED FLAG WARNING IN EFFECT FROM 1 PM TO 8 PM PDT SATURDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR THE LAHONTAN BASIN PRIMARILY NORTH OF US-50... ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY EVENING FOR GUSTY WINDS AND LOW HUMIDITY PRIMARILY SOUTH OF US-50... The National Weather Service in Reno has issued a Red Flag Warning for gusty winds and low humidity, which is in effect from 1 PM to 8 PM PDT Saturday. The Fire Weather Watch is no longer in effect. * Changes...Upgraded to a Red Flag Warning on Sunday. * Affected Area...Fire Zone 429 Lahontan Basin including Churchill and Eastern Mineral Counties. * Winds...Southwest to west 15 to 25 mph with gusts to 40 mph Saturday, shifting to northwest 10 to 20 mph with gusts to 35 mph Sunday afternoon. * Humidity...Saturday: 7-12%. Sunday: 15-20% north of US-50, 10- 15% south of US-50. * Duration...4-7 hours Saturday. 2-4 hours Sunday. * 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. && $$ CAZ270-278-NVZ420-423-458-182300- /O.UPG.KREV.FW.A.0016.210918T2000Z-210919T0300Z/ /O.NEW.KREV.FW.W.0017.210918T2000Z-210919T0300Z/ Surprise Valley California-Eastern Lassen County- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- West Humboldt Basin in Pershing County-Northern Washoe County- 1135 AM PDT Fri Sep 17 2021 ...RED FLAG WARNING IN EFFECT FROM 1 PM TO 8 PM PDT SATURDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR PORTIONS OF NORTHEAST CALIFORNIA AND WESTERN NEVADA... The National Weather Service in Reno has issued a Red Flag Warning for gusty winds and low humidity, which is in effect from 1 PM to 8 PM PDT Saturday. The Fire Weather Watch is no longer in effect. * Changes...Upgraded to a Red Flag Warning on Sunday. * Affected Area...Fire Zone 270 Surprise Valley California, Fire Zone 278 Eastern Lassen County, Fire Zone 420 Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties, Fire Zone 423 West Humboldt Basin in Pershing County and Fire Zone 458 Northern Washoe County. * Winds...Southwest to west 15 to 30 mph with gusts 35 to 45 mph. Stronger gusts possible in wind prone areas. * Humidity...8-15%, except 15-20% closer to the Oregon border. * Duration...4 to 8 hours. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them. * Additional Information...Winds will remain elevated Saturday night, particularly for wind prone locations, midslopes, and ridges. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ CAZ274-NVZ421-182300- /O.CON.KREV.FW.A.0017.210919T1900Z-210920T0300Z/ Southern Mono County- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- 1135 AM PDT Fri Sep 17 2021 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR THE EASTERN SIERRA AND SOUTHERN PORTION OF THE LAHONTAN BASIN... * Changes...Wind speeds reduced slightly 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. * Winds...West 10 to 20 mph with gusts to 35 mph, with stronger gusts possible in wind prone areas. * Humidity...10-18%, increasing from the north to the south by late afternoon or early evening. * Duration...3 to 6 hours. * 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. * Additional Information...The greatest concern will be for areas near and east of the US-395 corridor. Humidity will be higher for the Sierra, but winds will still be gusty. 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. && $$ http://weather.gov/reno
3 follow-up statements
626 WWUS85 KREV 181046 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 346 AM PDT Sat Sep 18 2021 NVZ429-191100- /O.CON.KREV.FW.W.0017.210918T2000Z-210919T0300Z/ /O.CON.KREV.FW.A.0017.210919T1900Z-210920T0300Z/ Lahontan Basin including Churchill and Eastern Mineral Counties- 346 AM PDT Sat Sep 18 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO 8 PM PDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR THE LAHONTAN BASIN PRIMARILY NORTH OF US-50... ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY EVENING FOR GUSTY WINDS AND LOW HUMIDITY PRIMARILY SOUTH OF US-50... * Changes...No significant changes. * Affected Area...Fire Zone 429 Lahontan Basin including Churchill and Eastern Mineral Counties. * Winds...Southwest to west 15 to 25 mph with gusts to 40 mph today, shifting to northwest 10 to 20 mph with gusts to 35 mph Sunday afternoon. * Humidity...Today: 8-13%. Sunday: 12-17%, mainly south of US-50. * Duration...3 to 7 hours today. 1 to 4 hours Sunday. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ CAZ270-278-NVZ420-423-458-190300- /O.CON.KREV.FW.W.0017.210918T2000Z-210919T0300Z/ Surprise Valley California-Eastern Lassen County- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- West Humboldt Basin in Pershing County-Northern Washoe County- 346 AM PDT Sat Sep 18 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO 8 PM PDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR PORTIONS OF NORTHEAST CALIFORNIA AND WESTERN NEVADA... * Changes...Shorter duration of red flag conditions near Oregon border. * 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, Fire Zone 423 West Humboldt Basin in Pershing County and Fire Zone 458 Northern Washoe County. * Winds...Southwest to west 15 to 30 mph with gusts 35 to 45 mph. Stronger gusts possible in wind prone areas. * Humidity...8-16%, except 15-25% closer to the Oregon border. * Duration...4 to 8 hours, except 1 to 4 hours closer to the Oregon border. * 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. * Additional Information...Winds will remain elevated tonight, particularly for wind prone locations, midslopes, and ridges. 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. && $$ CAZ274-NVZ421-191100- /O.CON.KREV.FW.A.0017.210919T1900Z-210920T0300Z/ Southern Mono County- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- 346 AM PDT Sat Sep 18 2021 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR THE EASTERN SIERRA AND SOUTHERN PORTION OF THE LAHONTAN BASIN... * Changes...Shorter duration of possible critical conditions. * Affected Area...Fire Zone 274 Southern Mono County, Fire Zone 421 Southern Sierra Front including Alpine, Northern Mono, Southern Lyon and and Western Mineral Counties. * Winds...West 10 to 20 mph with gusts to 35 mph, with stronger gusts possible in wind prone areas. * Humidity...12-18%, mainly east of US-395. * Duration...1 to 4 hours. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them. * Additional Information...The greatest concern will be for areas near and east of the US-395 corridor. Humidity will be higher for the Sierra, but winds will still be gusty. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ http://weather.gov/reno
828 WWUS85 KREV 181738 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 1038 AM PDT Sat Sep 18 2021 NVZ429-190300- /O.CAN.KREV.FW.A.0017.210919T1900Z-210920T0300Z/ /O.CON.KREV.FW.W.0017.210918T2000Z-210919T0300Z/ Lahontan Basin including Churchill and Eastern Mineral Counties- 1038 AM PDT Sat Sep 18 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR THE LAHONTAN BASIN... ...FIRE WEATHER WATCH IS CANCELLED FOR GUSTY WINDS AND LOW HUMIDITY PRIMARILY SOUTH OF US-50... The National Weather Service in Reno has cancelled the Fire Weather Watch. * Changes...The Fire Weather Watch is being cancelled for Sunday due to a shorter duration and less widespread area of anticipated critical conditions. * Affected Area...Fire Zone 429 Lahontan Basin including Churchill and Eastern Mineral Counties. * Winds...Southwest to west 15 to 25 mph with gusts to 40 mph today, shifting to northwest 10 to 20 mph with gusts to 35 mph Sunday afternoon. * Humidity...Today: 8-13%. Sunday: 12-20%, lowest south of US-50. * Duration...3 to 7 hours today. Localized for a couple hours Sunday. * 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. && $$ NVZ421-190300- /O.CAN.KREV.FW.A.0017.210919T1900Z-210920T0300Z/ /O.EXA.KREV.FW.W.0017.210918T2000Z-210919T0300Z/ Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- 1038 AM PDT Sat Sep 18 2021 ...RED FLAG WARNING IN EFFECT UNTIL 8 PM PDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR THE EASTERN PORTION OF THE SOUTHERN SIERRA FRONT... ...FIRE WEATHER WATCH IS CANCELLED FOR GUSTY WINDS AND LOW HUMIDITY FOR THE SOUTHERN SIERRA FRONT ON SUNDAY... The National Weather Service in Reno has issued a Red Flag Warning for gusty winds and low humidity, which is in effect until 8 PM PDT this evening. The Fire Weather Watch has been cancelled. * Changes...Added the zone to the Red Flag Warning today. The Fire Weather Watch is being cancelled for Sunday due to a shorter duration and less widespread area of anticipated critical conditions. * Affected Area...Fire Zone 421 Southern Sierra Front including Alpine, Northern Mono, Southern Lyon and and Western Mineral Counties. * Winds...Today: Southwest 15-20 mph with gusts 35 to 40 mph. * Humidity...Today: 8-18%, lowest east of US-395. * Duration...3 to 7 hours. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them. * Additional Information...The greatest concern will be for areas near and east of the US-395 corridor. Humidity will be higher for the Sierra, but winds will still be gusty. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ CAZ274-181845- /O.CAN.KREV.FW.A.0017.210919T1900Z-210920T0300Z/ Southern Mono County- 1038 AM PDT Sat Sep 18 2021 ...FIRE WEATHER WATCH IS CANCELLED FOR GUSTY WINDS AND LOW HUMIDITY FOR THE EASTERN SIERRA... The National Weather Service in Reno has cancelled the Fire Weather Watch. The Fire Weather Watch is being cancelled Sunday due to a shorter duration and less widespread area of anticipated critical conditions. Winds will be rather breezy, but won't overlap for a long enough duration with lower humidity. $$ CAZ270-278-NVZ420-423-458-190300- /O.CON.KREV.FW.W.0017.210918T2000Z-210919T0300Z/ Surprise Valley California-Eastern Lassen County- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- West Humboldt Basin in Pershing County-Northern Washoe County- 1038 AM PDT Sat Sep 18 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR PORTIONS OF NORTHEAST CALIFORNIA AND WESTERN NEVADA... * Changes...None. * Affected Area...Fire Zone 270 Surprise Valley California, Fire Zone 278 Eastern Lassen County, Fire Zone 420 Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties, Fire Zone 423 West Humboldt Basin in Pershing County and Fire Zone 458 Northern Washoe County. * Winds...Southwest to west 15 to 30 mph with gusts 35 to 45 mph. Stronger gusts possible in wind prone areas. * Humidity...8-16%, except 10-20% closer to the Oregon border. * Duration...3 to 8 hours. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them. * Additional Information...Winds will remain elevated tonight, particularly for wind prone locations, midslopes, and ridges. PRECAUTIONARY/PREPAREDNESS ACTIONS... Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires. Follow local fire restrictions. Check weather.gov/reno for updates and livingwithfire.info for preparedness tips. && $$ http://weather.gov/reno
707 WWUS85 KREV 190255 RFWREV URGENT - FIRE WEATHER MESSAGE National Weather Service Reno NV 755 PM PDT Sat Sep 18 2021 CAZ270-278-NVZ420-421-423-429-458-190400- /O.EXP.KREV.FW.W.0017.000000T0000Z-210919T0300Z/ Surprise Valley California-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- 755 PM PDT Sat Sep 18 2021 ...RED FLAG WARNINGS WILL EXPIRE AT 8 PM PDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY... With rising humidities and decreasing valley winds all Red Flag Warnings will be expire at 8 pm. However, wind prone and mid- slope locations north of US-50, and mountain ridges will remain gusty all night long, with midslopes and ridges potentially seeing the strongest winds of this event overnight into the early Sunday morning hours. Periodic stronger gusts may surface in lower elevations overnight, possibly becoming more steady just before daybreak. $$ 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 17, 11:38 AM PDT | Lake Wind Advisory | REV | Churchill, Douglas, Lyon, Pershing, Washoe | 32 hr |
Nearby
Red Flag Warnings in Nevada, 2021Red 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.