Alert archive / Wyoming / Red Flag Warnings in 2021
Red Flag Warning 28, NWS Riverton, WY
NWS Riverton, WY issued this red flag warning at Nov 23, 2021, 3:00 AM MST for 5 counties in Wyoming. It was in force for 13 hr. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Nov 23, 2021, 3:00 AM MST (10:00 UTC)
- Expired
- Nov 23, 2021, 4:00 PM MST
- In force
- 13 hr
- Issued by
- NWS Riverton, WY
Counties Fremont County, WY, Hot Springs County, WY, Johnson County, WY, Natrona County, WY, Washakie County, WY
The radar
The Riverton/Lander radar (KRIW), 86 km from the middle of the area, began a volume at 09:58 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Nov 23, 9:35 AM MST | NON-TSTM WND GST 61 | 6 Nw Mills, WY | ASOS STATION KCPR CASPER AIRPORT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Riverton, WY (KRIW), launched 00:00Z, 10.0 hours before the alert went out and 81 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
- 3238 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 124 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
485 WWUS85 KRIW 231000 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 300 AM MST Tue Nov 23 2021 WYZ280-232300- /O.UPG.KRIW.FW.A.0018.211123T1700Z-211123T2300Z/ /O.NEW.KRIW.FW.W.0028.211123T1000Z-211123T2300Z/ Natrona County/Casper BLM- 300 AM MST Tue Nov 23 2021 ...RED FLAG WARNING IN EFFECT UNTIL 4 PM MST THIS AFTERNOON... The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect until 4 PM MST this afternoon. the Fire Weather Watch is no longer in effect.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 Central WY...Fire Weather Zone 280. * COUNTIES AFFECTED: In Central WY...Natrona. * WIND: Southwest 35 to 45 mph with gusts up to 60 mph. * HUMIDITY: 10 to 15 percent. * TEMPERATURES: Lows around 45. Highs in the mid to upper 50s. 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. && $$ WYZ281-232300- /O.UPG.KRIW.FW.A.0018.211123T1700Z-211123T2300Z/ /O.NEW.KRIW.FW.W.0028.211123T1700Z-211123T2300Z/ Johnson County/Casper BLM- 300 AM MST Tue Nov 23 2021 ...RED FLAG WARNING IN EFFECT FROM 10 AM THIS MORNING TO 4 PM MST THIS AFTERNOON... The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect from 10 AM this morning to 4 PM MST this afternoon. the Fire Weather Watch is no longer in effect. * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds will create erratic fire behavior with any new fire starts. * AFFECTED AREA: In North Central WY...Fire Weather Zone 281. * COUNTIES AFFECTED: In North Central WY...Johnson. * WIND: West 15 to 25 mph with gusts up to 40 mph. * HUMIDITY: 10 to 15 percent. * TEMPERATURES: Highs in the upper 50s to near 60. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ WYZ285-232300- /O.NEW.KRIW.FW.W.0028.211123T1700Z-211123T2300Z/ South Bighorn Mountains- 300 AM MST Tue Nov 23 2021 ...RED FLAG WARNING IN EFFECT FROM 10 AM THIS MORNING TO 4 PM MST THIS AFTERNOON... The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect from 10 AM this morning to 4 PM MST this afternoon. * 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 285. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Hot Springs...Johnson...Washakie. * WIND: West 20 to 30 mph with gusts up to 50 mph. * HUMIDITY: 12 to 15 percent. * TEMPERATURES: Highs in the upper 40s to low 50s. 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. && $$ http://weather.gov/riverton
1 follow-up statement
143 WWUS85 KRIW 232240 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 340 PM MST Tue Nov 23 2021 WYZ280-232345- /O.EXP.KRIW.FW.W.0028.000000T0000Z-211123T2300Z/ Natrona County/Casper BLM- 340 PM MST Tue Nov 23 2021 ...RED FLAG WARNING WILL EXPIRE AT 4 PM MST THIS AFTERNOON... Winds have begun to decrease this evening which will lower the fire danger. Cooler air and higher relative humidities arrive overnight as a cold front pushes in from the north. $$ WYZ281-285-232345- /O.EXP.KRIW.FW.W.0028.000000T0000Z-211123T2300Z/ Johnson County/Casper BLM-South Bighorn Mountains- 340 PM MST Tue Nov 23 2021 ...RED FLAG WARNING WILL EXPIRE AT 4 PM MST THIS AFTERNOON... Winds have begun to decrease this evening which will lower the fire danger. Cooler air and higher relative humidities arrive overnight as a cold front pushes in from the north. $$ http://weather.gov/riverton
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 23, 11:50 AM MST | Winter Weather Advisory | RIW | Fremont, Lincoln, Sublette, Teton | 20 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.