Alert archive / Montana / Snow Squall Warnings in 2022

Snow Squall Warning 10, NWS Missoula, MT

November 27, 2022Flathead County, Montana

NWS Missoula, MT issued this snow squall warning at Nov 27, 2022, 1:23 PM MST for Flathead County, Montana. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Nov 27, 2022, 1:23 PM MST (20:23 UTC)
Expired: Nov 27, 2022, 2:30 PM MST
In force: 67 min
Issued by: NWS Missoula, MT
Area: Storm-based polygon

County Flathead County, MT

The radar

The Missoula radar (KMSX), 140 km from the middle of the area, began a volume at 20:25 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, 8.4 hours before the alert went out and 274 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: 1679 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 230 m²/s²
0-3 km storm-relative helicity: 270 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this snow squall warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Missoula, MT wrote its last area forecast discussion before this snow squall warning went out at Nov 27, 5:27 AM MST, 7 hours 56 minutes earlier.

Area forecast discussion, Nov 27, 5:27 AM MST, 7 hours 56 minutes before

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In the hours before

Local storm report, Nov 27, 10:00 AM MST, 3 hours 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
1000 AM MST SUN NOV 27 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0958 AM     SNOW             6 SSW EUREKA            48.80N 115.11W
11/27/2022  E4.0 INCH        LINCOLN            MT   TRAINED SPOTTER

            ESTIMATE OF 4 TO 5 INCHES NEW SNOW.

&&

JK

Local storm report, Nov 27, 10:46 AM MST, 2 hours 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
1046 AM MST SUN NOV 27 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0800 AM     SNOW             YAAK                    48.83N 115.71W
11/27/2022  M3.4 INCH        LINCOLN            MT   COCORAHS

            COCORAHS STATION MT-LN-6 YAAK.

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 27, 1:41 PM MST	Special Weather Statement	MSO	Missoula	49 min
Nov 27, 2:09 PM MST	Special Weather Statement	MSO	Powell	51 min
Nov 27, 3:06 PM MST	Snow Squall Warning	MSO	Deer Lodge, Granite	54 min
Nov 27, 3:14 PM MST	Snow Squall Warning Significant damage threat	MSO	Powell	61 min
Nov 27, 3:38 PM MST	Snow Squall Warning Significant damage threat	MSO	Deer Lodge, Powell	67 min
Nov 27, 4:00 PM MST	Snow Squall Warning Significant damage threat	MSO	Deer Lodge, Powell, Silver Bow	60 min
Nov 27, 4:17 PM MST	Snow Squall Warning	MSO	Ravalli	58 min
Nov 27, 4:32 PM MST	Snow Squall Warning Significant damage threat	MSO	Deer Lodge, Silver Bow	58 min
Nov 27, 1:58 PM MST	Snow Squall Warning Significant damage threat	MSO	Idaho	47 min

Nearby

Snow Squall Warnings in Montana, 2022 Every snow squall warning in 2022

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.