Alert archive / Montana / Red Flag Warnings in 2021
Red Flag Warning 19, NWS Missoula, MT
NWS Missoula, MT issued this red flag warning at Sep 14, 2021, 12:39 PM MDT for 4 counties in Montana. It took effect at Sep 15, 2021, 12:00 PM MDT. It was in force for 9 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
- Sep 14, 2021, 12:39 PM MDT (18:39 UTC)
- In effect from
- Sep 15, 2021, 12:00 PM MDT
- Expired
- Sep 15, 2021, 9:00 PM MDT
- In force
- 9 hr
- Issued by
- NWS Missoula, MT
Counties Beaverhead County, MT, Jefferson County, MT, Madison County, MT, Silver Bow County, MT
The radar
The Missoula radar (KMSX), 200 km from the middle of the area, began a volume at 18:39 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
Great_falls, MT (KTFX), launched 12:00Z, 6.7 hours before the alert went out and 246 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
- 1610 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
929 WWUS85 KMSO 141839 RFWMSO URGENT - FIRE WEATHER MESSAGE National Weather Service Missoula MT 1239 PM MDT Tue Sep 14 2021 MTZ111-151845- /O.NEW.KMSO.FW.W.0019.210915T1800Z-210916T0300Z/ East Beaverhead- 1239 PM MDT Tue Sep 14 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT WEDNESDAY... * Affected area: Fire Zone 111 (East Beaverhead). * Impacts: The combination of gusty winds and low humidity will result in critical fire weather conditions. * Winds: West 17 to 27 mph with gusts 35 to 45 mph. * Minimum humidities: 15 to 20 percent. && $$
1 follow-up statement
769 WWUS85 KMSO 160246 RFWMSO URGENT - FIRE WEATHER MESSAGE National Weather Service Missoula MT 846 PM MDT Wed Sep 15 2021 MTZ111-160400- /O.EXP.KMSO.FW.W.0019.000000T0000Z-210916T0300Z/ East Beaverhead- 846 PM MDT Wed Sep 15 2021 ...RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING... Winds are diminishing and relative humidity is rising. The warning will expire at 9 PM. && $$
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 14, 2:36 PM MDT | Freeze Watch | MSO | Flathead, Lincoln, Sanders | 23 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.