Alert archive / Wyoming / Red Flag Warnings in 2021
Red Flag Warning 1, NWS Riverton, WY
NWS Riverton, WY issued this red flag warning at Jun 15, 2021, 3:13 AM MDT for 5 counties in Wyoming. It took effect at Jun 15, 2021, 1:00 PM MDT. 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
- Jun 15, 2021, 3:13 AM MDT (09:13 UTC)
- In effect from
- Jun 15, 2021, 1:00 PM MDT
- Expired
- Jun 15, 2021, 8:00 PM MDT
- In force
- 7 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 09:12 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, 9.2 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
- 4874 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
342 WWUS85 KRIW 150913 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 313 AM MDT Tue Jun 15 2021 WYZ280-281-300-152115- /O.NEW.KRIW.FW.W.0001.210615T1900Z-210616T0200Z/ Natrona County/Casper BLM-Johnson County/Casper BLM- Casper Mountain- 313 AM MDT Tue Jun 15 2021 ...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 8 PM MDT THIS EVENING... The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect from 1 PM this afternoon to 8 PM MDT this evening. * IMPACTS: Low Humidities...Hot 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: Southwest 15 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 5 percent. * TEMPERATURES: Highs in the upper 90s to mid 100s across lower elevations and low 90s across Casper Mountain. 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. && $$ WYZ285-152115- /O.NEW.KRIW.FW.W.0001.210615T1900Z-210616T0200Z/ South Bighorn Mountains- 313 AM MDT Tue Jun 15 2021 ...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 8 PM MDT THIS EVENING... The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect from 1 PM this afternoon to 8 PM MDT this evening. * IMPACTS: Low Humidities...Hot Temperatures...and Strong Gusty Winds will create erratic fire behavior and new fire starts. * AFFECTED AREA: In Central WY...Fire Weather Zone 285. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Hot Springs...Johnson...Washakie. * WIND: Southwest 15 to 25 mph with gusts up to 40 mph. * HUMIDITY: As low as 6 percent. * TEMPERATURES: Highs in the upper 80s to mid 90s. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ http://weather.gov/riverton
2 follow-up statements
358 WWUS85 KRIW 151812 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 1212 PM MDT Tue Jun 15 2021 WYZ280-281-300-160200- /O.CON.KRIW.FW.W.0001.210615T1900Z-210616T0200Z/ Natrona County/Casper BLM-Johnson County/Casper BLM- Casper Mountain- 1212 PM MDT Tue Jun 15 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING... * IMPACTS: Low Humidities...Hot 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: Southwest 15 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 5 percent. * TEMPERATURES: Highs in the upper 90s to 105 across lower elevations and low 90s across Casper Mountain. 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. && $$ WYZ285-160200- /O.CON.KRIW.FW.W.0001.210615T1900Z-210616T0200Z/ South Bighorn Mountains- 1212 PM MDT Tue Jun 15 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING... * IMPACTS: Low Humidities...Hot Temperatures...and Strong Gusty Winds will create erratic fire behavior and new fire starts. * AFFECTED AREA: In Central WY...Fire Weather Zone 285. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Hot Springs...Johnson...Washakie. * WIND: Southwest 15 to 25 mph with gusts up to 40 mph. * HUMIDITY: As low as 6 percent. * TEMPERATURES: Highs in the upper 80s to mid 90s. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ http://weather.gov/riverton
327 WWUS85 KRIW 160148 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 748 PM MDT Tue Jun 15 2021 WYZ280-281-300-160300- /O.EXP.KRIW.FW.W.0001.000000T0000Z-210616T0200Z/ Natrona County/Casper BLM-Johnson County/Casper BLM- Casper Mountain- 748 PM MDT Tue Jun 15 2021 ...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING... Wind speeds will continue to decrease this evening along with cooling temperatures. Thus, Red Flag conditions will be ending after 8 PM MDT. The Red Flag Warning will be allowed to expire. $$ WYZ285-160300- /O.EXP.KRIW.FW.W.0001.000000T0000Z-210616T0200Z/ South Bighorn Mountains- 748 PM MDT Tue Jun 15 2021 ...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING... Wind speeds will continue to decrease this evening along with cooling temperatures. Thus, Red Flag conditions will be ending after 8 PM MDT. The Red Flag Warning will be allowed to expire. $$ http://weather.gov/riverton
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.