Alert archive / Montana / Red Flag Warnings in 2021

Red Flag Warning 11, NWS Missoula, MT

July 22, 20217 counties in Montana

NWS Missoula, MT issued this red flag warning at Jul 22, 2021, 1:32 PM MDT for 7 counties in Montana. It took effect at Jul 23, 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: Jul 22, 2021, 1:32 PM MDT (19:32 UTC)
In effect from: Jul 23, 2021, 12:00 PM MDT
Expired: Jul 23, 2021, 9:00 PM MDT
In force: 9 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 19:36 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, 7.5 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 160 J/kg
Mixed-layer CIN: -256 J/kg
Mixed-layer LCL: 2029 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

872 
WWUS85 KMSO 221932
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
132 PM MDT Thu Jul 22 2021

MTZ110-111-231945-
/O.UPG.KMSO.FW.A.0004.210723T1800Z-210724T0300Z/
/O.NEW.KMSO.FW.W.0011.210723T1800Z-210724T0300Z/
Deerlodge/West Beaverhead-East Beaverhead-
132 PM MDT Thu Jul 22 2021

...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT FRIDAY...

The Fire Weather Watch is no longer in effect. 

* Affected area: Fire Zone 110 (Deerlodge/West Beaverhead). Fire 
  Zone 111 (East Beaverhead). 

* Impacts: The combination of gusty winds and low humidity will 
  produce critical fire weather conditions. 

* Winds: Northwest 20 to 25 mph with gusts to around 35 mph.

* Minimum humidities: 10 to 15 percent.

&&

$$

MTZ105-107-230300-
/O.CON.KMSO.FW.W.0010.000000T0000Z-210723T0300Z/
Flathead/Glacier Park-Salish and Kootenai Reservation-
132 PM MDT Thu Jul 22 2021

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...

* Affected area:
   Fire Zone 105 (Flathead/Glacier Park).
   Fire Zone 107 (Salish and Kootenai Reservation).

* Impacts: The combination of gusty winds and low humidity will 
  produce critical fire weather conditions. 

* Winds: Southwest to west 20 to 25 mph with gusts to 30 to 35 
  mph. 

* Minimum humidities: 10 to 15 percent.

&&

$$

3 follow-up statements

550 
WWUS85 KMSO 230239
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
839 PM MDT Thu Jul 22 2021

MTZ105-107-230345-
/O.EXP.KMSO.FW.W.0010.000000T0000Z-210723T0300Z/
Flathead/Glacier Park-Salish and Kootenai Reservation-
839 PM MDT Thu Jul 22 2021

...RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING...

* Affected area: Fire Zone 105 (Flathead/Glacier Park). Fire 
  Zone 107 (Salish and Kootenai Reservation). 

* Impacts: Winds will gradually decrease the rest of the evening
  with some improvement in Rh overnight. 

&&

$$

MTZ110-111-240245-
/O.CON.KMSO.FW.W.0011.210723T1800Z-210724T0300Z/
Deerlodge/West Beaverhead-East Beaverhead-
839 PM MDT Thu Jul 22 2021

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT
FRIDAY...

* Affected area:
   Fire Zone 110 (Deerlodge/West Beaverhead).
   Fire Zone 111 (East Beaverhead).

* Impacts: The combination of gusty winds and low humidity will 
  produce critical fire weather conditions. 

* Winds: Northwest 20 to 25 mph with gusts to around 35 mph.

* Minimum humidities: 10 to 15 percent.

&&

$$

414 
WWUS85 KMSO 231032
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
432 AM MDT Fri Jul 23 2021

MTZ110-111-240300-
/O.CON.KMSO.FW.W.0011.210723T1800Z-210724T0300Z/
Deerlodge/West Beaverhead-East Beaverhead-
432 AM MDT Fri Jul 23 2021

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 9 PM MDT
THIS EVENING...

* Affected area:
   Fire Zone 110 (Deerlodge/West Beaverhead).
   Fire Zone 111 (East Beaverhead).

* Impacts: The combination of gusty winds and low humidity will 
  produce critical fire weather conditions. 

* Winds: Northwest 20 to 25 mph with gusts to around 35 mph.

* Minimum humidities: 10 to 15 percent.

&&

$$

671 
WWUS85 KMSO 240238
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
838 PM MDT Fri Jul 23 2021

MTZ110-111-240345-
/O.EXP.KMSO.FW.W.0011.000000T0000Z-210724T0300Z/
Deerlodge/West Beaverhead-East Beaverhead-
838 PM MDT Fri Jul 23 2021

...RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING...

* Affected area: Fire Zone 110 (Deerlodge/West Beaverhead). Fire 
  Zone 111 (East Beaverhead). 

* Impacts: Winds will continue to diminish this evening with
  improving Rh overnight.
  

&&

$$

The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 21, 6:01 PM MDT	Severe Thunderstorm Warning	MSO	Missoula, Powell	29 min
Jul 21, 6:38 PM MDT	Special Weather Statement	MSO	Granite	22 min
Jul 21, 6:54 PM MDT	Severe Thunderstorm Warning	MSO	Granite, Missoula, Powell	36 min
Jul 21, 7:20 PM MDT	Special Weather Statement	MSO	Granite	25 min
Jul 21, 7:30 PM MDT	Severe Thunderstorm Warning	MSO	Granite, Missoula, Powell	30 min
Jul 21, 7:51 PM MDT	Special Weather Statement	MSO	Powell	9 min
Jul 21, 8:02 PM MDT	Special Weather Statement	MSO	Powell	28 min
Jul 21, 9:04 PM MDT	Special Weather Statement	MSO	Granite	41 min
Jul 21, 9:18 PM MDT	Severe Thunderstorm Warning	MSO	Granite	27 min
Jul 21, 10:12 PM MDT	Special Weather Statement	MSO	Powell	48 min
Jul 22, 1:59 PM MDT	Special Weather Statement	MSO		46 min

Nearby

Red Flag Warnings in Montana, 2021 Every 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.