Alert archive / Montana / Snow Squall Warnings in 2020
Snow Squall Warning 13, NWS Missoula, MT
NWS Missoula, MT issued this snow squall warning at Dec 22, 2020, 10:11 AM MST for Flathead County, Montana. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Dec 22, 2020, 10:11 AM MST (17:11 UTC)
- Expired
- Dec 22, 2020, 10:45 AM MST
- In force
- 34 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
County Flathead County, MT
The radar
The Missoula radar (KMSX), 136 km from the middle of the area, began a volume at 17:09 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
Spokane, WA (KOTX), launched 12:00Z, 5.2 hours before the alert went out and 167 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1198 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
547
WWUS55 KMSO 221713
SQWMSO
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Missoula MT
1011 AM MST Tue Dec 22 2020
MTC029-221745-
/O.NEW.KMSO.SQ.W.0013.201222T1711Z-201222T1745Z/
Flathead MT-
1011 AM MST Tue Dec 22 2020
The National Weather Service in Missoula has issued a
* Snow Squall Warning for...
Central Flathead County in northwestern Montana...
* Until 1045 AM MST.
* At 1011 AM MST, a dangerous area of intense snow was located over
Evergreen, moving south at 10 mph.
HAZARD...Extremely poor visibility in heavy snow and blowing snow.
Wind gusts greater than 30 mph.
SOURCE...Radar indicated.
IMPACT...Dangerous life-threatening travel.
* Kalispell...Highway 93
Locations impacted include...
Kalispell, Evergreen, Columbia Falls, La Salle and Somers.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.
&&
LAT...LON 4837 11439 4837 11416 4806 11416 4806 11442
TIME...MOT...LOC 1711Z 005DEG 9KT 4824 11429
$$2 follow-up statements
454
WWUS55 KMSO 221732
SQWMSO
Snow Squall Warning
National Weather Service Missoula MT
1031 AM MST Tue Dec 22 2020
MTC029-221745-
/O.CON.KMSO.SQ.W.0013.000000T0000Z-201222T1745Z/
Flathead MT-
1031 AM MST Tue Dec 22 2020
...A SNOW SQUALL WARNING REMAINS IN EFFECT UNTIL 1045 AM MST FOR
CENTRAL FLATHEAD COUNTY...
At 1031 AM MST, a dangerous snow squall was located near Kalispell,
moving south at 10 mph.
HAZARD...Extremely poor visibility in heavy snow and blowing snow.
Wind gusts greater than 30 mph.
SOURCE...Radar and webcams.
IMPACT...Dangerous life-threatening travel.
Highway 93 Kalispell to Somers
Locations impacted include...
Kalispell, Evergreen, La Salle and Somers.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.
&&
LAT...LON 4833 11438 4833 11417 4806 11416 4806 11442
TIME...MOT...LOC 1731Z 002DEG 9KT 4814 11429
$$455 WWUS55 KMSO 221743 SQWMSO Snow Squall Warning National Weather Service Missoula MT 1042 AM MST Tue Dec 22 2020 MTC029-221752- /O.EXP.KMSO.SQ.W.0013.000000T0000Z-201222T1745Z/ Flathead MT- 1042 AM MST Tue Dec 22 2020 ...THE SNOW SQUALL WARNING FOR CENTRAL FLATHEAD COUNTY WILL EXPIRE AT 1045 AM MST... The snow squall which prompted the warning continues to move south. Therefore, the snow squall warning will be allowed to expire. Low visibility and Snow and ice-covered roads will continue to make travel difficult. LAT...LON 4833 11438 4833 11417 4806 11416 4806 11442 TIME...MOT...LOC 1742Z 005DEG 9KT 4812 11429 $$
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 22, 10:39 AM MST | Snow Squall Warning | MSO | Flathead, Lake | 36 min |
| Dec 22, 4:06 PM MST | Snow Squall Warning | MSO | Granite, Missoula, Powell | 84 min |
Nearby
Snow Squall Warnings in Montana, 2020Every snow squall 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.