Alert archive / Montana / Red Flag Warnings in 2021

Red Flag Warning 22, NWS Missoula, MT

September 26, 20214 counties in Montana

NWS Missoula, MT issued this red flag warning at Sep 26, 2021, 1:08 PM MDT for 4 counties in Montana. It took effect at Sep 27, 2021, 1:00 PM MDT. It was in force for 21 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 26, 2021, 1:08 PM MDT (19:08 UTC)
In effect from
Sep 27, 2021, 1:00 PM MDT
Expired
Sep 28, 2021, 10:04 AM MDT
In force
21 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 19:14 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, 7.1 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.

Skew-T log-pSkew-T log-p diagram, Great_falls, MT at 12:00Z on 2021-09-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Great_falls, MT at 12:00Z on 2021-09-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2953 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
64 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

479 
WWUS85 KMSO 261908
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
108 PM MDT Sun Sep 26 2021

MTZ111-271915-
/O.UPG.KMSO.FW.A.0010.210927T1900Z-210928T0300Z/
/O.NEW.KMSO.FW.W.0022.210927T1900Z-210928T0300Z/
/O.CON.KMSO.FW.W.0021.000000T0000Z-210927T0300Z/
East Beaverhead-
108 PM MDT Sun Sep 26 2021

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
...RED FLAG WARNING IN EFFECT FROM 1 PM TO 9 PM MDT MONDAY...

The Fire Weather Watch is no longer in effect. 

* Affected area: Fire Zone 111 (East Beaverhead). 

* Impacts: The combination of gusty winds and low humidity may 
  result in critical fire weather conditions. 

* Winds: Southwest to west winds 15 to 20 mph with gusts of 25 to
  35 mph. 

* Minimum humidities: 10-15 percent.

&&

$$
4 follow-up statements
063 
WWUS85 KMSO 270312
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
912 PM MDT Sun Sep 26 2021

MTZ111-280300-
/O.EXP.KMSO.FW.W.0021.000000T0000Z-210927T0300Z/
/O.CON.KMSO.FW.W.0022.210927T1900Z-210928T0300Z/
East Beaverhead-
912 PM MDT Sun Sep 26 2021

...RED FLAG WARNING REMAINS IN EFFECT FROM 1 PM TO 9 PM MDT
MONDAY...


* Affected area:
   Fire Zone 111 (East Beaverhead).

* Impacts: The combination of gusty winds and low humidity may 
  result in critical fire weather conditions. 

* Winds: Southwest to west winds 15 to 20 mph with gusts of 25 
  to 35 mph. 

* Minimum humidities: 10-15 percent.

&&

$$
499 
WWUS85 KMSO 271419
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
819 AM MDT Mon Sep 27 2021

MTZ111-280300-
/O.CON.KMSO.FW.W.0022.210927T1900Z-210928T0300Z/
East Beaverhead-
819 AM MDT Mon Sep 27 2021

...RED FLAG WARNING REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO
9 PM MDT THIS EVENING...

* Affected area:
   Fire Zone 111 (East Beaverhead).

* Impacts: The combination of gusty winds and low humidity may 
  result in critical fire weather conditions. 

* Winds: Southwest to west winds 15 to 20 mph with gusts of 25 
  to 35 mph. 

* Minimum humidities: 10 to 15 percent.

&&

$$
838 
WWUS85 KMSO 271628
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
1028 AM MDT Mon Sep 27 2021

MTZ111-281800-
/O.EXT.KMSO.FW.W.0022.210927T1900Z-210928T1800Z/
East Beaverhead-
1028 AM MDT Mon Sep 27 2021

...RED FLAG WARNING NOW IN EFFECT UNTIL NOON MDT TUESDAY...

* Affected area:
   Fire Zone 111 (East Beaverhead).

* Impacts: The combination of gusty winds and low humidity may
  result in critical fire weather conditions. Gusty winds and low
  humidity will remain through the night and Tuesday morning. 

* Winds: Southwest to west winds 15 to 20 mph with gusts of 25 
  to 35 mph. 

* Minimum humidities: 10 to 15 percent.

&&

$$
905 
WWUS85 KMSO 281604
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
1004 AM MDT Tue Sep 28 2021

MTZ111-281715-
/O.CAN.KMSO.FW.W.0022.000000T0000Z-210928T1800Z/
East Beaverhead-
1004 AM MDT Tue Sep 28 2021

...RED FLAG WARNING IS CANCELLED...

The National Weather Service in Missoula has cancelled the Red
Flag Warning. 

Relative humidity is rising as a cold front moves across the area.
Southwest to west wind gusts of 20-25 mph will continue through
the afternoon. 

$$

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.