Alert archive / Montana / Red Flag Warnings in 2021

Red Flag Warning 2, NWS Missoula, MT

April 1, 20214 counties in Montana

NWS Missoula, MT issued this red flag warning at Apr 1, 2021, 11:52 AM MDT for 4 counties in Montana. 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
Apr 1, 2021, 11:52 AM MDT (17:52 UTC)
Expired
Apr 1, 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 17:54 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, 5.9 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 2021-04-01Temperature 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 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 2021-04-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 246 square meters per square second.19395878Sfc1 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
2824 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
246 m²/s²
0-3 km storm-relative helicity
272 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

428 
WWUS85 KMSO 011752
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
1152 AM MDT Thu Apr 1 2021

MTZ111-020300-
/O.NEW.KMSO.FW.W.0002.210401T1752Z-210402T0300Z/
East Beaverhead-
1152 AM MDT Thu Apr 1 2021

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

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

* Impacts: Strong winds with low humidity will produce critical
  fire weather conditions. Any fires in grass and rangelands will
  spread rapidly. 

* Winds: South to southwest 25-35 mph with gusts to 40 mph.

* Minimum humidities: 12-18 percent

&&

$$
1 follow-up statement
481 
WWUS85 KMSO 020237
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
837 PM MDT Thu Apr 1 2021

MTZ111-020345-
/O.EXP.KMSO.FW.W.0002.000000T0000Z-210402T0300Z/
East Beaverhead-
837 PM MDT Thu Apr 1 2021

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

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


&&

$$

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.