Alert archive / Wyoming / Red Flag Warnings in 2021
Red Flag Warning 17, NWS Riverton, WY
NWS Riverton, WY issued this red flag warning at Aug 30, 2021, 2:37 AM MDT for 6 counties in Wyoming. It took effect at Aug 30, 2021, 2:00 PM MDT. It was in force for 5 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
- Aug 30, 2021, 2:37 AM MDT (08:37 UTC)
- In effect from
- Aug 30, 2021, 2:00 PM MDT
- Expired
- Aug 30, 2021, 7:00 PM MDT
- In force
- 5 hr
- Issued by
- NWS Riverton, WY
Counties Fremont County, WY, Lincoln County, WY, Natrona County, WY, Sublette County, WY, Sweetwater County, WY, Uinta County, WY
The radar
The Riverton/Lander radar (KRIW), 103 km from the middle of the area, began a volume at 08:34 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, 8.6 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
- 3297 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
653 WWUS85 KRIW 300837 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 237 AM MDT Mon Aug 30 2021 WYZ277>279-289-310100- /O.NEW.KRIW.FW.W.0017.210830T2000Z-210831T0100Z/ Lincoln and Uinta Counties/Lower Elevations- Upper Green River Basin/Rock Springs BLM- Sweetwater County/Rock Springs BLM/Flaming Gorge NRA- Granite/Green/Ferris/Rattlesnake Mountains- 237 AM MDT Mon Aug 30 2021 ...RED FLAG WARNING IN EFFECT FROM 2 PM THIS AFTERNOON TO 7 PM MDT THIS EVENING... The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect from 2 PM this afternoon to 7 PM MDT this evening. * IMPACTS: Low Humidities and Strong Gusty Winds may lead to erratic fire behavior and quick growth of any new fire starts. * AFFECTED AREA: In Central WY Fire Zone....289. In Southwest WY Fire Zones...277...279. In West Central WY Fire Zone....278. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In Southwest WY...Sweetwater...Uinta. In West Central WY...Lincoln...Sublette. * WIND: West 15 to 20 mph with gusts 30 to 35 mph. * HUMIDITY: 10 to 15 percent. 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. && $$ http://weather.gov/riverton
1 follow-up statement
427 WWUS85 KRIW 310042 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 642 PM MDT Mon Aug 30 2021 WYZ277>279-289-310145- /O.EXP.KRIW.FW.W.0017.000000T0000Z-210831T0100Z/ Lincoln and Uinta Counties/Lower Elevations- Upper Green River Basin/Rock Springs BLM- Sweetwater County/Rock Springs BLM/Flaming Gorge NRA- Granite/Green/Ferris/Rattlesnake Mountains- 642 PM MDT Mon Aug 30 2021 ...RED FLAG WARNING WILL EXPIRE AT 7 PM MDT THIS EVENING... Winds have decreased across the area this evening. Accordingly, the Red Flag Warning will be allowed to expire. $$ 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.