Alert archive / Montana / Red Flag Warnings in 2020

Red Flag Warning 2, NWS Missoula, MT

August 10, 20207 counties in Montana

NWS Missoula, MT issued this red flag warning at Aug 10, 2020, 11:22 AM MDT for 7 counties in Montana. It took effect at Aug 11, 2020, 12:00 PM MDT. It was in force for 33 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: Aug 10, 2020, 11:22 AM MDT (17:22 UTC)
In effect from: Aug 11, 2020, 12:00 PM MDT
Expired: Aug 12, 2020, 9:00 PM MDT
In force: 33 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 17:22 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, 5.4 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2336 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

088 
WWUS85 KMSO 101722
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
1122 AM MDT Mon Aug 10 2020

MTZ110-111-130300-
/O.UPG.KMSO.FW.A.0001.200811T1800Z-200813T0300Z/
/O.NEW.KMSO.FW.W.0002.200811T1800Z-200813T0300Z/
Deerlodge/West Beaverhead-East Beaverhead-
1122 AM MDT Mon Aug 10 2020

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

The Fire Weather Watch is no longer in effect. 

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

* Impacts: Gusty westerly and southwesterly winds from a dry 
  cold front with very low humidity. 

* Winds: 
  Tuesday: West and southwest 10-15 mph with gusts to 25 mph. 
  Tuesday night: Lower valleys will decouple, but mid-slopes and
   ridgetops will remain unstable and dry with westerly winds 20
   to 30 mph 
  Wednesday: West and southwest 15-20 mph with gusts to 35 mph.

* Minimum humidities: 10-20 percent.

* Thunderstorms: Slight chance for dry lightning and erratic, 
  gusty winds, especially in the Madison District on Wednesday.

&&

$$

1 follow-up statement

613 
WWUS85 KMSO 130242
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
842 PM MDT Wed Aug 12 2020

MTZ110-111-130345-
/O.EXP.KMSO.FW.W.0002.000000T0000Z-200813T0300Z/
Deerlodge/West Beaverhead-East Beaverhead-
842 PM MDT Wed Aug 12 2020

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

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

* Winds will continue to decrease, with slowly improving RHs
  through the evening.

&&

$$

Nearby

Red Flag Warnings in Montana, 2020 Every red flag warning in 2020

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.