Special Weather Statement, NWS Missoula, MT

Area Forecast Discussion
National Weather Service Missoula MT
256 PM MDT Tue Aug 19 2014

...COLD AND RAINY CONDITIONS DEVELOPING ACROSS NORTHERN ROCKIES
LATE THIS WEEK THROUGH THE WEEKEND...

.DISCUSSION...

A broad and relatively cold storm system will impact the Northern
Rockies with copious rainfall through this weekend. Active showers
and thunderstorms will be present across the region through this
evening. Some storm cells may contain brief heavy rain and frequent
lightning. Temperatures will slowly cool through Friday and
Saturday, with successive resurgence in shower and thunderstorm
activity each day. The height of this forthcoming precipitation
event will be in the Friday/Saturday time frame. Concurrent with the
maximum precipitation will be the coldest temperatures, some 10 to
20 degrees below normal, as well as snow levels as low as 6500 feet
in Glacier Park on Friday morning and again Saturday morning.
Otherwise, anticipate a a raw, cold, rainy scenario for this first
half of the weekend.

Cool temperatures and scattered showers will continue through at
least Monday, with a slow warm-up and high pressure developing by
the middle of next week.

Global models have been fairly consistent in depicting a strong
ridge of high pressure just south of the Gulf of Alaska for the next
10+ days, which will translate into a relatively cool scenario with
occasional storm systems moving from the northwest across the
Northern Rockies. The implications of this stagnant pattern are
likely decreasing wildfire activity, decrease in wildfire smoke,
relatively cool August temperatures, and above normal precipitation
for the bulk of the region.

&&

.AVIATION...

Showers and thunderstorms will be present at times near all area
terminals through 20/0300Z. Winds may become erratic for a time
near developing storm cells. Anticipate occasional terrain
obscurations through 20/0300Z. Skies will partially clear
thereafter. Another bout of showers and thunderstorms near all
area terminals will develop after 20/1800Z, however coverage will
be greater than today.

&&

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

Zumpfe

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
225 PM MDT TUE AUG 19 2014

MTZ002-192115-
WEST GLACIER REGION-
225 PM MDT TUE AUG 19 2014

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN FLATHEAD COUNTY UNTIL
315 PM MDT...

AT 218 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 10 MILES WEST OF
GOING-TO-THE-SUN ROAD IN GLACIER PARK TO WEST GLACIER TO 6 MILES
SOUTHWEST OF WEST GLACIER...AND MOVING EAST AT 35 MPH.

WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH
HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING.

LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...GOING-TO-THE-SUN
ROAD IN GLACIER PARK...LAKE MCDONALD AND LOGAN PASS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF THREATENING WEATHER APPROACHES YOUR AREA...GO INDOORS AND STAY
AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL
PROTECTED AREA.

&&

LAT...LON 4883 11375 4879 11376 4874 11370 4862 11374
      4860 11371 4859 11357 4858 11355 4850 11360
      4843 11412 4879 11401
TIME...MOT...LOC 2025Z 266DEG 30KT 4874 11391 4856 11391
          4845 11400

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
336 PM MDT TUE AUG 19 2014

MTZ002-003-192200-
FLATHEAD/MISSION VALLEYS-WEST GLACIER REGION-
336 PM MDT TUE AUG 19 2014

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL FLATHEAD COUNTY UNTIL 400
PM MDT...

AT 334 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 6 MILES SOUTH OF WHITEFISH...OR 7 MILES NORTHWEST
OF EVERGREEN...MOVING EAST AT 20 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...COLUMBIA FALLS AND LA
SALLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF THREATENING WEATHER APPROACHES YOUR AREA...GO INDOORS AND STAY
AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL
PROTECTED AREA.

&&

LAT...LON 4845 11412 4829 11404 4826 11438 4838 11444
TIME...MOT...LOC 2136Z 253DEG 17KT 4832 11432

LV