Alert archive / Wyoming / Red Flag Warnings in 2021
Red Flag Warning 21, NWS Rapid City, SD
NWS Rapid City, SD issued this red flag warning at Aug 25, 2021, 3:50 AM MDT for Campbell County, Wyoming. It took effect at Aug 25, 2021, 12:00 PM MDT. It was in force for 6 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 25, 2021, 3:50 AM MDT (09:50 UTC)
- In effect from
- Aug 25, 2021, 12:00 PM MDT
- Expired
- Aug 25, 2021, 6:09 PM MDT
- In force
- 6 hr
- Issued by
- NWS Rapid City, SD
County Campbell County, WY
The nearest sounding before it
Rapid City, SD (KUNR), launched 00:00Z, 9.8 hours before the alert went out and 214 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
- 2566 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 307 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
902 WWUS83 KUNR 250950 RFWUNR URGENT - FIRE WEATHER MESSAGE National Weather Service Rapid City SD 350 AM MDT Wed Aug 25 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR CAMPBELL COUNTY... .Warm, dry, and breezy conditions can be expected across much of Campbell County this afternoon, especially western portions of the county. Relative humidities will drop into the teens, with southerly winds of 10 to 20 mph and gusts to around 30 mph. Red flag conditions are most likely to develop across areas west of Gillette and Wright. Conditions will gradually improve early this evening. WYZ314-315-260100- /O.UPG.KUNR.FW.A.0016.210825T1700Z-210826T0200Z/ /O.NEW.KUNR.FW.W.0021.210825T1800Z-210826T0200Z/ Northern Campbell-Southern Campbell- 350 AM MDT Wed Aug 25 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 314 AND 315... The National Weather Service in Rapid City has issued a Red Flag Warning for gusty winds and low relative humidity, which is in effect from noon today to 8 PM MDT this evening. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zones 314 Northern Campbell and 315 Southern Campbell. * WINDS...South 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...The combination of gusty winds and low relative humidity would produce critical fire weather conditions. 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. && $$
2 follow-up statements
023 WWUS83 KUNR 252005 RFWUNR URGENT - FIRE WEATHER MESSAGE National Weather Service Rapid City SD 205 PM MDT Wed Aug 25 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR CAMPBELL COUNTY... .Warm, dry, and breezy conditions can be expected across much of Campbell County this afternoon, especially western portions of the county. Relative humidities will continue to drop into the teens, with southerly winds gusting up to 35 mph. Red flag conditions are most likely across areas west of Gillette and Wright. Conditions will gradually improve early this evening. WYZ314-315-260200- /O.CON.KUNR.FW.W.0021.000000T0000Z-210826T0200Z/ Northern Campbell-Southern Campbell- 205 PM MDT Wed Aug 25 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 314 AND 315... * AFFECTED AREA...Fire Weather Zones 314 Northern Campbell and 315 Southern Campbell. * WINDS...South 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...The combination of gusty winds and low relative humidity would produce critical fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A red flag warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$
962 WWUS83 KUNR 260009 RFWUNR URGENT - FIRE WEATHER MESSAGE National Weather Service Rapid City SD 609 PM MDT Wed Aug 25 2021 WYZ314-315-260115- /O.CAN.KUNR.FW.W.0021.000000T0000Z-210826T0200Z/ Northern Campbell-Southern Campbell- 609 PM MDT Wed Aug 25 2021 ...RED FLAG WARNING IS CANCELLED FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 314 AND 315... The National Weather Service in Rapid City has cancelled the Red Flag Warning. The relative humidity has increased to above 25 percent for most locations. $$ Bunkers
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.