Alert archive / Montana / Snow Squall Warnings in 2021
Snow Squall Warning 1, NWS Missoula, MT
NWS Missoula, MT issued this snow squall warning at Dec 24, 2021, 8:39 PM MST for Mineral County, Montana. It was in force for 81 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 24, 2021, 8:39 PM MST (03:39 UTC)
- Expired
- Dec 24, 2021, 10:00 PM MST
- In force
- 81 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
County Mineral County, MT
The radar
The Missoula radar (KMSX), 135 km from the middle of the area, began a volume at 03:43 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 00:00Z, 3.7 hours before the alert went out and 61 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
- 864 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 187 m²/s²
- 0-3 km storm-relative helicity
- 171 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
637
WWUS55 KMSO 250339
SQWMSO
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Missoula MT
839 PM MST Fri Dec 24 2021
MTC061-250500-
/O.NEW.KMSO.SQ.W.0001.211225T0339Z-211225T0500Z/
Mineral MT-
839 PM MST Fri Dec 24 2021
The National Weather Service in Missoula has issued a
* Snow Squall Warning for...
Northwestern Mineral County in west central Montana...
* Until 1000 PM MST.
* At 835 PM MST, a dangerous area of intense snow was located 39
miles southwest of Lookout Pass moving northeast at 35 mph.
Moderate snow will continue until 9:05 to 9:15 MST when this
intense band of snow is expected to arrive.
HAZARD...Poor visibility in heavy snow.
SOURCE...Radar indicated.
IMPACT...Dangerous life-threatening travel.
I-90 from Lookout Pass and 10 miles east, approximately the first
weigh station in Montana.
Locations impacted include...
Lookout Pass.
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 4745 11572 4746 11570 4746 11568 4743 11562
4741 11564
TIME...MOT...LOC 0335Z 239DEG 35KT 4751 11555
$$The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 25, 8:23 AM MST | Special Weather Statement | MSO | Missoula | 52 min |
| Dec 25, 11:00 AM MST | Wind Chill Advisory | MSO | Flathead, Lake | 7 hr |
| Dec 25, 11:00 AM MST | Winter Weather Advisory | MSO | Flathead, Lake | 6 hr |
| Dec 25, 12:43 PM MST | Winter Weather Advisory | MSO | Deer Lodge, Flathead, Granite, Lake, Lincoln, Mineral and 5 more | 28 hr |
Nearby
Snow Squall Warnings in Montana, 2021Every snow squall 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.