Alert archive / Montana / Red Flag Warnings in 2021
Red Flag Warning 13, NWS Missoula, MT
NWS Missoula, MT issued this red flag warning at Aug 7, 2021, 1:09 PM MDT for 7 counties in Montana. It took effect at Aug 8, 2021, 12:00 PM MDT. It was in force for 7 hr. 6 reports 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
- Aug 7, 2021, 1:09 PM MDT (19:09 UTC)
- In effect from
- Aug 8, 2021, 12:00 PM MDT
- Expired
- Aug 8, 2021, 7:29 PM MDT
- In force
- 7 hr
- Issued by
- NWS Missoula, MT
Counties Beaverhead County, MT, Deer Lodge County, MT, Granite County, MT, Jefferson County, MT, Madison County, MT, Powell County, MT, Silver Bow County, MT
The radar
The Missoula radar (KMSX), 154 km from the middle of the area, began a volume at 19:11 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 |
|---|---|---|---|
| Aug 8, 3:55 PM MDT | TSTM WND GST 55 | Twin Bridges Airport, MT | CONVECTIVE WIND GUST MEASURED BY KRVF AWOS. |
| Aug 8, 4:20 PM MDT | TSTM WND GST 59 | Mcallister, MT | LOCATION ESTIMATED. |
| Aug 8, 5:00 PM MDT | TSTM WND GST 60 | 8 Ne Bannack, MT | MESONET STATION MTM14 (MT-MESO). |
| Aug 8, 5:16 PM MDT | TSTM WND GST 50 | 3 Ssw Ennis, MT | MESONET STATION ENNM8 ENNIS RAWS. |
| Aug 8, 5:47 PM MDT | TSTM WND GST 52 | 10 Wsw Grant, MT | MESONET STATION BRRM8 BRENNER RAWS. |
| Aug 8, 6:10 PM MDT | TSTM WND GST 56 | Monida, MT | MESONET STATION MTMQM MONIDA PASS (MT DOT). |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 7.2 hours before the alert went out and 231 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
- 1763 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
207 WWUS85 KMSO 071909 RFWMSO URGENT - FIRE WEATHER MESSAGE National Weather Service Missoula MT 109 PM MDT Sat Aug 7 2021 MTZ110-090300- /O.UPG.KMSO.FW.A.0005.210808T1800Z-210809T0300Z/ /O.NEW.KMSO.FW.W.0013.210808T1800Z-210809T0300Z/ Deerlodge/West Beaverhead- 109 PM MDT Sat Aug 7 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT SUNDAY... The Fire Weather Watch is no longer in effect. * Affected area: Fire Zone 110 (Deerlodge/West Beaverhead). * Impacts: Anticipate a combination of thunderstorms, gusty winds, and low relative humidity. The driest conditions coupled with strong winds are most likely along and south of the Continental Divide. * Thunderstorms: A mix of wet and dry. * Wind gusts: Southwest to west 35 to 50 mph. Higher gusts possible with thunderstorms. * Minimum Humidities: 17 to 27 percent. && $$ MTZ111-090300- /O.UPG.KMSO.FW.A.0005.210808T1800Z-210809T0300Z/ /O.NEW.KMSO.FW.W.0013.210808T1800Z-210809T0300Z/ East Beaverhead- 109 PM MDT Sat Aug 7 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT SUNDAY... The Fire Weather Watch is no longer in effect. * Affected area: Fire Zone 111 (East Beaverhead). * Impacts: Anticipate a combination of thunderstorms, gusty winds, and low relative humidity. * Thunderstorms: A mix of wet and dry. * Wind gusts: Southwest to west 35 to 50 mph. Higher gusts possible with thunderstorms. * Minimum Humidities: 13 to 23 percent. && $$
1 follow-up statement
673 WWUS85 KMSO 090129 RFWMSO URGENT - FIRE WEATHER MESSAGE National Weather Service Missoula MT 729 PM MDT Sun Aug 8 2021 MTZ110-111-090230- /O.CAN.KMSO.FW.W.0013.000000T0000Z-210809T0300Z/ Deerlodge/West Beaverhead-East Beaverhead- 729 PM MDT Sun Aug 8 2021 ...RED FLAG WARNING IS CANCELLED... The National Weather Service in Missoula has cancelled the Red Flag Warning. The cold front driven gusty winds, which prompted the Red Flag Warning, have subsided with the front's progression into central Montana. This plus rainfall increasing humidity across the area are leading to the early cancellation of the warning. $$
Nearby
Red Flag Warnings in Montana, 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.