Alert archive / Montana / Winter Storm Watches in 2014
Winter Storm Watch 4, NWS Missoula, MT
NWS Missoula, MT issued this winter storm watch at Feb 21, 2014, 3:03 PM MST for 10 counties in Montana; Clearwater County, Idaho County, Lemhi County, Idaho. It took effect at Feb 22, 2014, 5:00 PM MST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Feb 21, 2014, 3:03 PM MST (22:03 UTC)
- In effect from
- Feb 22, 2014, 5:00 PM MST
- Expired
- Feb 22, 2014, 2:57 PM MST
- In force
- Issued by
- NWS Missoula, MT
Counties Clearwater County, ID, Idaho County, ID, Lemhi County, ID, Deer Lodge County, MT, Flathead County, MT, Granite County, MT, Lake County, MT, Mineral County, MT, Missoula County, MT, Powell County, MT, Ravalli County, MT, Sanders County, MT, Silver Bow County, MT
The radar
The Missoula radar (KMSX), 44 km from the middle of the area, began a volume at 22:08 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.
What forecasters said that day
The local office's own words before this winter storm watch 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 winter storm watch went out at Feb 21, 2:53 PM MST, 10 minutes earlier.
Area forecast discussion, Feb 21, 2:53 PM MST, 10 minutes before
Area Forecast Discussion
National Weather Service Missoula MT
253 PM MST Fri Feb 21 2014
...HEAVY SNOW (6+INCHES) IN WESTERN MONTANA VALLEYS SUNDAY & MONDAY...
.DISCUSSION...Snow bands continue to pester western Montana this
afternoon bringing periods of heavy snow showers lowering
visibilities. The main impacts to these showers will be over
mountain passes where snow is sticking. These showers should begin
to dissipate by mid evening. Once the sun sets and temperatures
lower the wet roadways may quickly freeze causing hazardous travel
through Saturday morning.
THE BIG STORY this weekend will be AN INCREASING CONFIDENCE FOR
HEAVY SNOW SUNDAY AND MONDAY. The major impact from this snow will
occur in most valleys of western Montana and parts of central
Idaho. Cold arctic air will spill across the continental divide
and interact with relatively warmer and moist air to our west.
This is a classic or textbook weather pattern for heavy snow in
the valleys of western Montana. A boundary separating very cold
air to the north and wetter, warmer air to the southwest will
develop over central Idaho late Saturday. This boundary will
move north and expand across western Montana persisting for 24 to
36 hours over the region.
CONFIDENCE IS INCREASING FOR WIDESPREAD SNOW AMOUNTS OF 6-12
INCHES ACROSS MUCH OF WEST CENTRAL MONTANA.
This type of system has produced very localized heavy snow,
sometimes only 20 miles wide, with amounts up to 2 feet in about
24 hours. Confidence in such extreme amounts is low but not out of
the equation. Because of this winter storm watches have been
issued.
Tuesday will remain cold and showery with while the boundary that
causes the heavy snow washes out and weakens. By Tuesday night,
dry air moves into the region under a weak ridge and clears out
the clouds. Clear skies, dry air, and a deep snow pack with light
winds will cause very cold conditions Wednesday morning in western
Montana with temperatures around or below zero degrees. Central
Idaho will be spared from this unusual cold weather.
Please stay tuned to www.nws.gov/missoula and our twitter
feed @NWSMissoula for updates and current information.
&&
.AVIATION...Snow bands will continue through the afternoon and
taper off this evening. Visibility less than a mile and ceilings
under 2000 feet are likely directly under snow bands with
conditions improving rapidly as you move away from the bands.
Expect frequent and changing mountain obscurations. Bands will not
be stationary, so expect rapidly changing conditions at area
terminals, especially KMSO, KGPI, and KBTM.
&&
.MSO WATCHES/WARNINGS/ADVISORIES...
MT...WINTER STORM WATCH from Saturday afternoon through Monday
morning Bitterroot/Sapphire Mountains...Butte/Blackfoot
Region...Flathead/Mission Valleys...Lower Clark Fork
Region...Missoula/Bitterroot Valleys...Potomac/Seeley Lake
Region.
WINTER WEATHER ADVISORY until 4 PM MST this afternoon for Lolo
Pass and Lost Trail Pass IN THE Bitterroot/Sapphire
Mountains.
WINTER WEATHER ADVISORY until 4 PM MST this afternoon for I-90
Lookout Pass to Haugan IN THE Lower Clark Fork Region.
WINTER WEATHER ADVISORY until 4 PM MST this afternoon for
MacDonald Pass IN THE Butte/Blackfoot Region.
ID...WINTER STORM WATCH from Saturday afternoon through Monday
morning Eastern Lemhi County...Northern Clearwater
Mountains...Southern Clearwater Mountains.
WINTER WEATHER ADVISORY until 4 PM MST /3 PM PST/ this afternoon
for Lolo Pass and Lost Trail Pass IN THE Eastern Lemhi
County...Southern Clearwater Mountains.
&&
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https://www.twitter.com/NWSMissoulaIn the hours before
Local storm report, Feb 21, 9:20 AM MST, 5 hours 43 minutes before
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</html>Local storm report, Feb 21, 9:22 AM MST, 5 hours 41 minutes before
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</html>Local storm report, Feb 21, 10:54 AM MST, 4 hours 9 minutes before
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</html>Local storm report, Feb 21, 12:50 PM MST, 2 hours 13 minutes before
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</html>Local storm report, Feb 21, 12:56 PM MST, 2 hours 7 minutes before
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</html>The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 21, 4:47 AM MST | Winter Storm Warning | MSO | Deer Lodge, Flathead, Granite, Lake, Mineral, Missoula and 4 more | 6 hr |
Nearby
Winter Storm Watches in Montana, 2014Winter Storm Watches in Idaho, 2014Every winter storm watch in 2014
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.