Alert archive / Montana / Red Flag Warnings in 2021

Red Flag Warning 23, NWS Missoula, MT

October 4, 20214 counties in Montana

NWS Missoula, MT issued this red flag warning at Oct 4, 2021, 12:17 PM MDT for 4 counties in Montana. It took effect at Oct 5, 2021, 12:00 PM MDT. It was in force for 8 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
Oct 4, 2021, 12:17 PM MDT (18:17 UTC)
In effect from
Oct 5, 2021, 12:00 PM MDT
Expired
Oct 5, 2021, 8:00 PM MDT
In force
8 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 18:15 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-pSkew-T log-p diagram, Great_falls, MT at 12:00Z on 2021-10-04Temperature 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 2021-10-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 63 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
2812 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
63 m²/s²
0-3 km storm-relative helicity
107 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

097 
WWUS85 KMSO 041817
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
1217 PM MDT Mon Oct 4 2021

MTZ111-051830-
/O.NEW.KMSO.FW.W.0023.211005T1800Z-211006T0600Z/
East Beaverhead-
1217 PM MDT Mon Oct 4 2021

...RED FLAG WARNING IN EFFECT FROM NOON TUESDAY TO MIDNIGHT MDT
TUESDAY NIGHT...

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

* Impacts: The combination of gusty winds and low humidity will
  result in critical fire weather conditions Tuesday after through
  the evening. Gusty winds and low humidity will remain a concern
  up to around midnight Tuesday night.

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

* Minimum humidities: 9 to 12 percent.

&&

$$
1 follow-up statement
815 
WWUS85 KMSO 060200
RFWMSO

URGENT - FIRE WEATHER MESSAGE
National Weather Service Missoula MT
800 PM MDT Tue Oct 5 2021

MTZ111-060300-
/O.CAN.KMSO.FW.W.0023.000000T0000Z-211006T0600Z/
East Beaverhead-
800 PM MDT Tue Oct 5 2021

...RED FLAG WARNING IS CANCELLED...

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

RHs will continue to increase, with winds decreasing through the
rest of the evening.

$$

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.