Alert archive / Wyoming / Red Flag Warnings in 2021
Red Flag Warning 19, NWS Riverton, WY
NWS Riverton, WY issued this red flag warning at Sep 9, 2021, 2:52 AM MDT for 6 counties in Wyoming. It took effect at Sep 9, 2021, 12:00 PM MDT. It was in force for 8 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, 2:52 AM MDT (08:52 UTC)
- In effect from
- Sep 9, 2021, 12:00 PM MDT
- Expired
- Sep 9, 2021, 8:00 PM MDT
- In force
- 8 hr
- Issued by
- NWS Riverton, WY
Counties Fremont County, WY, Hot Springs County, WY, Lincoln County, WY, Park County, WY, Sublette County, WY, Teton County, WY
The radar
The Riverton/Lander radar (KRIW), 100 km from the middle of the area, began a volume at 08:54 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
Riverton, WY (KRIW), launched 00:00Z, 8.9 hours before the alert went out and 106 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
- 3864 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 151 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
375 WWUS85 KRIW 090852 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 252 AM MDT Thu Sep 9 2021 WYZ286-287-092200- /O.UPG.KRIW.FW.A.0010.210909T1800Z-210910T0200Z/ /O.NEW.KRIW.FW.W.0019.210909T1800Z-210910T0200Z/ Absaroka Mountains/North Shoshone NF-Owl Creek Mountains- 252 AM MDT Thu Sep 9 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS EVENING... The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect from noon today to 8 PM MDT this evening. The Fire Weather Watch is no longer in effect. * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds will create erratic fire behavior with any new fire starts. * AFFECTED AREA: In North Central WY Fire Zone....287. In Northwest WY Fire Zone....286. * COUNTIES AFFECTED: In Central WY...Fremont. In North Central WY...Hot Springs...Park. * WIND: West 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 11 percent. * TEMPERATURES: Highs in the lower 80s. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ WYZ276-092200- /O.UPG.KRIW.FW.A.0010.210909T1800Z-210910T0200Z/ /O.NEW.KRIW.FW.W.0019.210909T1800Z-210910T0200Z/ Cody Foothills- 252 AM MDT Thu Sep 9 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS EVENING... The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect from noon today to 8 PM MDT this evening. The Fire Weather Watch is no longer in effect. * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds will create erratic fire behavior with any new fire starts. * AFFECTED AREA: In North Central WY...Fire Weather Zone 276. * COUNTIES AFFECTED: In North Central WY...Park. * WIND: Northwest 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 10 percent. * TEMPERATURES: Highs around 90. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ WYZ415-092200- /O.UPG.KRIW.FW.A.0010.210909T1800Z-210910T0200Z/ /O.NEW.KRIW.FW.W.0019.210909T1800Z-210910T0200Z/ North Zone Bridger Teton NF and Grand Teton NP- 252 AM MDT Thu Sep 9 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS EVENING... The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect from noon today to 8 PM MDT this evening. The Fire Weather Watch is no longer in effect. * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds will create erratic fire behavior with any new fire starts. * AFFECTED AREA: In Northwest WY...Fire Weather Zone 415. * COUNTIES AFFECTED: In Central WY...Fremont. In North Central WY...Park...Teton. * WIND: Southwest 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 13 percent. * TEMPERATURES: Highs in the mid to upper 80s. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ WYZ288-092200- /O.NEW.KRIW.FW.W.0019.210909T1800Z-210910T0200Z/ East Wind River Mountains/South Shoshone NF- 252 AM MDT Thu Sep 9 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS EVENING... The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect from noon today to 8 PM MDT this evening. * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds will create erratic fire behavior with any new fire starts. * AFFECTED AREA: In Central WY...Fire Weather Zone 288. * COUNTIES AFFECTED: In Central WY...Fremont. In West Central WY...Sublette. * WIND: West 10 to 20 mph with gusts up to 30 mph. * HUMIDITY: As low as 10 percent. * TEMPERATURES: Highs in the upper 70s. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ WYZ282-283-285-289-092200- /O.NEW.KRIW.FW.A.0011.210910T1800Z-210911T0200Z/ South Big Horn Basin/Worland BLM- Upper Wind River Basin/Wind River Basin-South Bighorn Mountains- Granite/Green/Ferris/Rattlesnake Mountains- 252 AM MDT Thu Sep 9 2021 ...FIRE WEATHER WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH FRIDAY EVENING... The National Weather Service in Riverton has issued a Fire Weather Watch, which is in effect from Friday afternoon through Friday evening. * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds will create erratic fire behavior with any new fire starts. * AFFECTED AREA: In Central WY Fire Zones...283...285...289. In North Central WY Fire Zone....282. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Hot Springs...Johnson...Washakie. In Southwest WY...Sweetwater. * WIND: Southwest 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 10 percent. * TEMPERATURES: Highs in the mid 80s. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions could occur. Listen for later forecasts and possible Red Flag Warnings. && $$ WYZ280-281-300-092200- /O.NEW.KRIW.FW.A.0011.210910T1800Z-210911T0200Z/ Natrona County/Casper BLM-Johnson County/Casper BLM- Casper Mountain- 252 AM MDT Thu Sep 9 2021 ...FIRE WEATHER WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH FRIDAY EVENING... The National Weather Service in Riverton has issued a Fire Weather Watch, which is in effect from Friday afternoon through Friday evening. * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds will create erratic fire behavior with any new fire starts. * AFFECTED AREA: In Central WY Fire Zones...280...300. In North Central WY Fire Zone....281. * COUNTIES AFFECTED: In Central WY...Natrona. In North Central WY...Johnson. * WIND: West 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 9 percent. * TEMPERATURES: Highs in the lower 90s. Highs in the mid 80s across Casper Mountain. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions could occur. Listen for later forecasts and possible Red Flag Warnings. && $$ WYZ279-092200- /O.NEW.KRIW.FW.A.0011.210910T1800Z-210911T0200Z/ Sweetwater County/Rock Springs BLM/Flaming Gorge NRA- 252 AM MDT Thu Sep 9 2021 ...FIRE WEATHER WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH FRIDAY EVENING... The National Weather Service in Riverton has issued a Fire Weather Watch, which is in effect from Friday afternoon through Friday evening. * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...Strong Gusty Winds...and Dry Thunderstorms with gusty and erratic outflow winds will create erratic fire behavior and possible new fire starts. * AFFECTED AREA: In Southwest WY...Fire Weather Zone 279. * COUNTIES AFFECTED: In Southwest WY...Sweetwater. * WIND: West 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 12 percent. * TEMPERATURES: Highs in the mid 80s. * THUNDERSTORMS: Isolated dry thunderstorms will develop during the afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions could occur. Listen for later forecasts and possible Red Flag Warnings. && $$ http://weather.gov/riverton
1 follow-up statement
504 WWUS85 KRIW 091841 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 1241 PM MDT Thu Sep 9 2021 WYZ286>288-100200- /O.CON.KRIW.FW.W.0019.000000T0000Z-210910T0200Z/ Absaroka Mountains/North Shoshone NF-Owl Creek Mountains- East Wind River Mountains/South Shoshone NF- 1241 PM MDT Thu Sep 9 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING... * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds will create erratic fire behavior and new fire starts. * AFFECTED AREA: In Central WY Fire Zone....288. In North Central WY Fire Zone....287. In Northwest WY Fire Zone....286. * COUNTIES AFFECTED: In Central WY...Fremont. In North Central WY...Hot Springs...Park. In West Central WY...Sublette. * WIND: West 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 11 percent. * TEMPERATURES: Highs in the lower 80s. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ WYZ276-100200- /O.CON.KRIW.FW.W.0019.000000T0000Z-210910T0200Z/ Cody Foothills- 1241 PM MDT Thu Sep 9 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING... * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds will create erratic fire behavior and new fire starts. * AFFECTED AREA: In North Central WY...Fire Weather Zone 276. * COUNTIES AFFECTED: In North Central WY...Park. * WIND: Northwest 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 10 percent. * TEMPERATURES: Highs around 90. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ WYZ415-100200- /O.CON.KRIW.FW.W.0019.000000T0000Z-210910T0200Z/ North Zone Bridger Teton NF and Grand Teton NP- 1241 PM MDT Thu Sep 9 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING... * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds will create erratic fire behavior and new fire starts. * AFFECTED AREA: In Northwest WY...Fire Weather Zone 415. * COUNTIES AFFECTED: In Central WY...Fremont. In North Central WY...Park...Teton. * WIND: Southwest 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 13 percent. * TEMPERATURES: Highs in the mid to upper 80s. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ WYZ282-283-285-289-100600- /O.CON.KRIW.FW.A.0011.210910T1800Z-210911T0200Z/ South Big Horn Basin/Worland BLM- Upper Wind River Basin/Wind River Basin-South Bighorn Mountains- Granite/Green/Ferris/Rattlesnake Mountains- 1241 PM MDT Thu Sep 9 2021 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON THROUGH FRIDAY EVENING... * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds will create erratic fire behavior and new fire starts. * AFFECTED AREA: In Central WY Fire Zones...283...285...289. In North Central WY Fire Zone....282. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Hot Springs...Johnson...Washakie. In Southwest WY...Sweetwater. * WIND: Southwest 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 10 percent. * TEMPERATURES: Highs in the mid 80s. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions could occur. Listen for later forecasts and possible Red Flag Warnings. && $$ WYZ280-281-300-100600- /O.CON.KRIW.FW.A.0011.210910T1800Z-210911T0200Z/ Natrona County/Casper BLM-Johnson County/Casper BLM- Casper Mountain- 1241 PM MDT Thu Sep 9 2021 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON THROUGH FRIDAY EVENING... * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds will create erratic fire behavior and new fire starts. * AFFECTED AREA: In Central WY Fire Zones...280...300. In North Central WY Fire Zone....281. * COUNTIES AFFECTED: In Central WY...Natrona. In North Central WY...Johnson. * WIND: West 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 9 percent. * TEMPERATURES: Highs in the lower 90s. Highs in the mid 80s across Casper Mountain. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions could occur. Listen for later forecasts and possible Red Flag Warnings. && $$ WYZ279-100600- /O.CON.KRIW.FW.A.0011.210910T1800Z-210911T0200Z/ Sweetwater County/Rock Springs BLM/Flaming Gorge NRA- 1241 PM MDT Thu Sep 9 2021 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON THROUGH FRIDAY EVENING... * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds will create erratic fire behavior and new fire starts. * AFFECTED AREA: In Southwest WY...Fire Weather Zone 279. * COUNTIES AFFECTED: In Southwest WY...Sweetwater. * WIND: West 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 12 percent. * TEMPERATURES: Highs in the mid 80s. * THUNDERSTORMS: Isolated dry thunderstorms will develop during the afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions could occur. Listen for later forecasts and possible Red Flag Warnings. && $$ http://weather.gov/riverton
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 2:52 AM MDT | Fire Weather Watch | RIW | Fremont, Hot Springs, Johnson, Natrona, Sweetwater, Washakie | 23 hr |
Nearby
Red Flag Warnings in Wyoming, 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.