Lake Wind Advisory 2, NWS Missoula, MT

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URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
544 PM MDT MON MAY 9 2016



MTZ003-100045-
/O.CAN.KMSO.LW.Y.0002.000000T0000Z-160510T0000Z/
FLATHEAD/MISSION VALLEYS-
544 PM MDT MON MAY 9 2016

...LAKE WIND ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS CANCELLED THE LAKE
WIND ADVISORY. 

$$

Area Forecast Discussion
National Weather Service Missoula MT
440 AM MDT MON MAY 9 2016

...SIGNIFICANTLY COOLER...SNOW DOWN TO 4000 FEET ACROSS NORTHERN
ROCKIES THROUGH TUESDAY MORNING...

.DISCUSSION...

A significantly cool and moist storm system from Canada will
continue to move across much of the Northern Rockies today. Snow
levels are expected to fall 4000 feet through this evening. Some
brief, heavy precipitation along the leading edge of the cold air
could present some travel impacts due to snow-covered roads and
low visibility. The Glacier Park Region will be most prone to the
snowfall today, with the snow threat shifting southward toward the
Butte/Blackfoot Region tonight. The evolving weather scenario will
be tricky due to the timing of precipitation versus the arrival of
cold air, particularly true for Butte/Blackfoot Region. If the
snow is delayed for southwest Montana, then it is likely that
roadways over Continental Divide passes will be covered by a mix
of ice/snow/slush for a time late this evening through Tuesday
morning. Even if timing of snowfall is much sooner than tonight,
hazardous winter travel over Continental Divide passes remains
plausible throughout this afternoon and evening. Thunderstorms
will be embedded within shower activity throughout today, with
frequent lightning possible. A brief bout of thunderstorms
containing small hail are possible along the cold front this
afternoon, most likely occurring over the Butte/Blackfoot Region.
Also, some gusty northeast winds will develop today, along with
the snow, that may limit visibility at times over Marias Pass.

The threat of hazardous winter weather conditions lessen by
Tuesday afternoon, with warming and drying already underway across
much of north central Idaho. Mountain snow and valley rain showers
will linger over much of western Montana through sunset Tuesday.

Wednesday: Expect a rather pleasant day with seasonable temperatures
generally in the 60s across western Montana and 70s in the valleys
of north-central Idaho. The only threat for showers will be near
the Canadian border later in the day.

Thursday: A backdoor Canadian cold front will begin to slowly
move westward later in the day. With weak to moderate instability
ahead of this feature, showers and thunderstorms will be possible.
The biggest threats to the storms will be lightning and gusty
winds. Temperatures will generally be several degrees above
normal.

Friday: The easterly wind gradient will continue across north-
central Idaho and western Montana and could pose an issue with
gusty winds on area lakes. High temperatures will continue to be
pleasant and in the 60s and 70s in western Montana and in the
lower 80s across the Camas Prairie in Idaho.

Next weekend: An upper level trough will approach the region to
bring another chance for showers and thunderstorms. It seems the
best chance for shower activity will be over north-central Idaho
and southwest Montana, but confidence is low due to model
differences.

&&

.AVIATION...Periods of heavy rain showers and gusty northeast
winds will spread from north to south across the Northern Rockies
during the next 24 hours. A cold storm system out of Canada will
have some periods of heavy rain, particularly for KGPI through
10/0000Z. KMSO and KSMN will experience periodic showers from
around sunrise through 10/0300Z. There is a possibility of a
moderate thunderstorm with small hail passing KBTM between
09/1700Z and 09/1900Z, with periods of moderate snow showers
decreasing ceilings and visibility through 10/0600Z. Wind gusts to
30 knots are possible at times for all area terminals, mostly
before 10/0300Z. Terrain will be obscured for much of the next 24
hours.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...None.
ID...None.
&&