Special Weather Statement, NWS Missoula, MT

Area Forecast Discussion
National Weather Service Missoula MT
235 PM MDT Mon Jul 8 2013

.DISCUSSION...
Tonight...Scattered showers and thunderstorms will continue this
afternoon and evening across western Montana and Lemhi county in
response to a passing weather disturbance. Some of the
thunderstorms will be strong enough to produce small hail, gusty
winds and brief heavy rain. The thunderstorm threat will diminish
this evening once the sun sets below the horizon and drier air
moves in from the west. Drier air has already started to move into
Clearwater and Idaho counties of north-central Idaho where we have
seen convective activity decrease this afternoon. This disturbance
will be moving into southern Alberta later this evening resulting
in clearing skies and calm conditions.

Tuesday through Wednesday...A ridge of high pressure will develop
and strengthen during this period. Warmer, dry conditions are
expected. There is a potential for high-based thunderstorm late
Wednesday afternoon across west-central Montana and Lemhi county
(south of Missoula) if enough monsoonal moisture creeps northward
from the Great Basin region.

The models are indicating that the ridge of high pressure will
move off to the east as a trough digs along the coast. This
movement of the ridge axis will cause slightly cooler
temperatures, but an increase in afternoon/evening winds. The
trough is expected to flatten and move inland causing westerly
flow over the Northern Rockies. This flow pattern will keep
temperatures near normal readings with gusty afternoon and evening
winds. The timing of weak disturbances through the flow is
uncertain at this time, but shower activity is anticipated to be
fairly minimal.

&&

.AVIATION... Scattered showers and thunderstorms continue across
western Montana and Lemhi county in response to a passing weather
disturbance. Some of the thunderstorms will be strong enough to
produce hail, gusty winds and brief heavy rain. KGPI and KBTM have
the greatest chance of being impacted by storms. Mountain tops
will be occasionally obscured in clouds and precipitation through
the evening hours. The thunderstorm threat will diminish this
evening once the sun sets below the horizon and drier air moves in
from the west. Drier air has already started to move into
Clearwater and Idaho counties of north-central Idaho where we have
seen convective activity decrease. This drying trend will extend
into western Montana as this disturbance moves into southern
Alberta later this evening. Favorable conditions for aviation
operations can be expected as skies clear and calm conditions
prevail into Tuesday.

&&

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

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
248 PM MDT MON JUL 8 2013

...TIME...  ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
...DATE...  ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0244 PM     HAIL             PARADISE                47.39N 114.81W
07/08/2013  E0.50 INCH       SANDERS            MT   PUBLIC

            DIME SIZED HAIL.

&&

IRIS SYSTEM

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
317 PM MDT MON JUL 8 2013

MTZ007-082200-
BUTTE/BLACKFOOT REGION-
317 PM MDT MON JUL 8 2013

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN GRANITE...SOUTHEASTERN
POWELL...NORTHERN SILVER BOW AND NORTHERN DEER LODGE COUNTIES UNTIL
400 PM MDT...

AT 312 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR WEST VALLEY...OR 5 MILES WEST OF ANACONDA...
MOVING EAST AT 45 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 AND FREQUENT
DANGEROUS LIGHTNING.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...WARM SPRINGS...
GALEN...LOST CREEK...OPPORTUNITY AND RACETRACK.

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.

IN ADDITION...THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR
LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR
ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.

&&

LAT...LON 4642 11231 4638 11235 4638 11240 4633 11245
      4632 11253 4630 11256 4619 11257 4619 11251
      4611 11250 4601 11323 4619 11329 4654 11232
      4645 11229
TIME...MOT...LOC 2117Z 256DEG 41KT 4616 11296

DICKERSON

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
320 PM MDT MON JUL 8 2013

MTZ002>004-043-082200-
FLATHEAD/MISSION VALLEYS-LOWER CLARK FORK REGION-POTOMAC/SEELEY LAKE
REGION-WEST GLACIER REGION-
320 PM MDT MON JUL 8 2013

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SANDERS...SOUTHERN
LAKE AND NORTHERN MISSOULA COUNTIES UNTIL 400 PM MDT...

AT 312 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 8 MILES NORTH OF DIXON...OR 19 MILES SOUTH OF
POLSON...MOVING EAST AT 35 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 AND FREQUENT
DANGEROUS LIGHTNING.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...SAINT IGNATIUS...
RONAN...CHARLO...ALLENTOWN...FORT CONNAH...KICKING HORSE AND CONDON.

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.

IN ADDITION...THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR
LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR
ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.

&&

LAT...LON 4764 11369 4733 11359 4723 11444 4752 11450
TIME...MOT...LOC 2120Z 261DEG 30KT 4744 11422

DICKERSON

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
337 PM MDT MON JUL 8 2013

...TIME...  ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
...DATE...  ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0334 PM     HAIL             1 N MOIESE              47.38N 114.26W
07/08/2013  E1.00 INCH       LAKE               MT   PUBLIC

            QUARTER SIZED HAIL AT NATIONAL BISON RANGE

&&

IRIS SYSTEM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
352 PM MDT MON JUL 8 2013

...TIME...  ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
...DATE...  ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0351 PM     HAIL             4 WNW CHARLO            47.45N 114.25W
07/08/2013  E0.75 INCH       LAKE               MT   PUBLIC

            DIME TO PENNEY SIZED HAIL

&&

IRIS SYSTEM

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