Alert archive / Montana / Red Flag Warnings in 2021

Red Flag Warning 10, NWS Missoula, MT

July 21, 20216 counties in Montana

NWS Missoula, MT issued this red flag warning at Jul 21, 2021, 12:17 PM MDT for 6 counties in Montana. It took effect at Jul 22, 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 21, 2021, 12:17 PM MDT (18:17 UTC)
In effect from: Jul 22, 2021, 12:00 PM MDT
Expired: Jul 22, 2021, 9:00 PM MDT
In force: 9 hr
Issued by: NWS Missoula, MT

Counties Flathead County, MT, Glacier County, MT, Lake County, MT, Missoula County, MT, Powell County, MT, Sanders County, MT

The radar

The Missoula radar (KMSX), 74 km from the middle of the area, began a volume at 18:18 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, 6.3 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-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: 158 J/kg
Mixed-layer CIN: -180 J/kg
Mixed-layer LCL: 1952 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

206 
WWUS85 KMSO 211817
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
1217 PM MDT Wed Jul 21 2021

MTZ110-230400-
/O.CAN.KMSO.FW.A.0003.210722T1800Z-210723T0300Z/
/O.NEW.KMSO.FW.A.0004.210723T1800Z-210724T0300Z/
Deerlodge/West Beaverhead-
1217 PM MDT Wed Jul 21 2021

...FIRE WEATHER WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH
FRIDAY EVENING...
...FIRE WEATHER WATCH IS CANCELLED...

The National Weather Service in Missoula has cancelled the Fire
Weather Watch. 

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

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

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

* Minimum humidities: 10 to 15 percent.

&&

$$

IDZ103-MTZ104-106-108-109-211930-
/O.CAN.KMSO.FW.A.0003.210722T1800Z-210723T0300Z/
Clearwater/Nez Perce-Kootenai-West Lolo-East Lolo-Bitterroot-
1217 PM MDT Wed Jul 21 2021 /1117 AM PDT Wed Jul 21 2021/

...FIRE WEATHER WATCH IS CANCELLED...

The National Weather Service in Missoula has cancelled the Fire
Weather Watch. 

The cold front timing has slowed so the minimum humidity will not
be as dry. 

$$

MTZ105-107-230300-
/O.UPG.KMSO.FW.A.0003.210722T1800Z-210723T0300Z/
/O.NEW.KMSO.FW.W.0010.210722T1800Z-210723T0300Z/
Flathead/Glacier Park-Salish and Kootenai Reservation-
1217 PM MDT Wed Jul 21 2021

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

The Fire Weather Watch is no longer in effect. 

* 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.

&&

$$

IDZ102-220400-
/O.CON.KMSO.FW.W.0009.000000T0000Z-210722T0400Z/
Palouse/Hells Canyon-
1117 AM PDT Wed Jul 21 2021

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

* Affected area:
   Fire Zone 102 (Palouse/Hells Canyon).

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

* Winds: West to northwest 15 to 20 mph with gusts to 25 to 30 
  mph. 

* Minimum humidities: 15 to 20 percent.

&&

$$

MTZ111-230400-
/O.NEW.KMSO.FW.A.0004.210723T1800Z-210724T0300Z/
East Beaverhead-
1217 PM MDT Wed Jul 21 2021

...FIRE WEATHER WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH
FRIDAY EVENING...

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

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

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

* Minimum humidities: 10 to 15 percent.

&&

$$

4 follow-up statements

251 
WWUS85 KMSO 220333
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
933 PM MDT Wed Jul 21 2021

IDZ102-220445-
/O.EXP.KMSO.FW.W.0009.000000T0000Z-210722T0400Z/
Palouse/Hells Canyon-
833 PM PDT Wed Jul 21 2021

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

* Affected area: Fire Zone 102 (Palouse/Hells Canyon). 

* Impacts: Winds are decreasing at this time.

&&

$$

MTZ105-107-230300-
/O.CON.KMSO.FW.W.0010.210722T1800Z-210723T0300Z/
Flathead/Glacier Park-Salish and Kootenai Reservation-
933 PM MDT Wed Jul 21 2021

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

* 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.

&&

$$

MTZ110-111-230345-
/O.CON.KMSO.FW.A.0004.210723T1800Z-210724T0300Z/
Deerlodge/West Beaverhead-East Beaverhead-
933 PM MDT Wed Jul 21 2021

...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON
THROUGH FRIDAY EVENING...

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

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

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

* Minimum humidities: 10 to 15 percent.

&&

$$

317 
WWUS85 KMSO 221015
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
415 AM MDT Thu Jul 22 2021

MTZ105-107-230300-
/O.CON.KMSO.FW.W.0010.210722T1800Z-210723T0300Z/
Flathead/Glacier Park-Salish and Kootenai Reservation-
415 AM MDT Thu Jul 22 2021

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 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.

&&

$$

MTZ110-111-231015-
/O.CON.KMSO.FW.A.0004.210723T1800Z-210724T0300Z/
Deerlodge/West Beaverhead-East Beaverhead-
415 AM MDT Thu Jul 22 2021

...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON
THROUGH FRIDAY EVENING...

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

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

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

* Minimum humidities: 10 to 15 percent.

&&

$$

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.

&&

$$

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.

&&

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 12:17 PM MDT	Fire Weather Watch	MSO	Beaverhead, Deer Lodge, Granite, Jefferson, Madison, Powell and 1 more	25 hr
Jul 21, 2:44 PM MDT	Special Weather Statement	MSO	Ravalli	31 min
Jul 21, 2:57 PM MDT	Special Weather Statement	MSO		33 min
Jul 21, 3:49 PM MDT	Special Weather Statement	MSO	Ravalli	26 min
Jul 21, 3:51 PM MDT	Special Weather Statement	MSO	Powell	24 min
Jul 21, 4:15 PM MDT	Special Weather Statement	MSO	Silver Bow	15 min
Jul 21, 4:40 PM MDT	Special Weather Statement	MSO	Granite	35 min
Jul 21, 4:53 PM MDT	Special Weather Statement	MSO	Missoula	37 min
Jul 21, 5:06 PM MDT	Special Weather Statement	MSO	Missoula	24 min
Jul 21, 5:12 PM MDT	Severe Thunderstorm Warning	MSO	Missoula	19 min
Jul 21, 5:33 PM MDT	Special Weather Statement	MSO	Missoula	27 min
Jul 21, 5:36 PM MDT	Severe Thunderstorm Warning	MSO	Missoula, Powell	24 min
Jul 21, 5:43 PM MDT	Special Weather Statement	MSO	Deer Lodge	17 min
Jul 21, 5:44 PM MDT	Special Weather Statement	MSO	Missoula	16 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.