Special Weather Statement, NWS Missoula, MT

Area Forecast Discussion
National Weather Service Missoula MT
244 PM MDT Tue Aug 9 2016

.DISCUSSION...A broad area of low pressure in eastern Washington
continues to usher in moisture and instability into the northern
Rockies this afternoon. Thunderstorms have developed across
central Idaho through west central and southwest Montana. Storms
are expected to continue to develop over this area and spread
northward into northwest Montana and along the Continental Divide
into Glacier NP. Storms have and will likely contain hail, gusty
outflows, and local areas of heavy rain.

The upper low will move over northwest Montana tonight. As it
does, expect continued thunderstorm activity and heavy rain
potential in northwest Montana. Glacier NP may be impacted the most
by heavy rain. The upper low will progress northeast into southern
Alberta early Wednesday. Wrap around moisture will occur behind
this low. Expect steady rain and cooler temperatures across the
Canadian border, especially over Glacier NP. A raw, cool
Wednesday is in store with snow levels lowering to around 8000
feet.

Thursday we will be influenced by a cooler northwesterly flow
with a few showers along the Divide.

A change to a warm and dry pattern under a high pressure ridge is
likely Friday and Saturday. A quick moving low pressure trough and
associated cool front will pass through the region Sunday. Expect
breezy conditions late Saturday and Sunday.

The dry pattern with a general westerly flow will continue through
early next week.

&&

.AVIATION...Scattered showers and thunderstorms will impact all
terminals this afternoon and evening. In addition to gusts to 40
mph and local heavy rain, some of the stronger storms may produce
half inch hail. After 10/0600z the upper low will move across
northwest Montana and the focus of most precip will be over KGPI
where showers will persist through Wednesday morning. Thunder
potential will diminish after midnight at KGPI.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...Red Flag Warning until 9 PM MDT this evening East Beaverhead.

ID...&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
149 PM MDT TUE AUG 9 2016

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

0510 PM     HAIL             7 S WILLIAMS LAKE       44.90N 113.97W
08/07/2016  E1.75 INCH       LEMHI              ID   TRAINED SPOTTER

            DAMAGE WAS REPORTED WITH THIS STORM. A FEW
            WINDSHIELDS WERE SMASHED IN AND A FEW CARS
            HAD SOME BODY DAMAGE.

&&

NWS MISSOULA MT
IRIS SYSTEM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
220 PM MDT TUE AUG 9 2016

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

0206 PM     HAIL             3 WNW CHARLOS HEIGHTS   46.15N 114.23W
08/09/2016  E0.75 INCH       RAVALLI            MT   PARK/FOREST SRVC

            REPORTED ON THE SOUTH SIDE OF THE ROARING
            LION FIRE.

&&

NWS MISSOULA MT
IRIS SYSTEM

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
227 PM MDT TUE AUG 9 2016

MTZ006-007-043-092100-
POTOMAC/SEELEY LAKE REGION MT-BITTERROOT/SAPPHIRE MOUNTAINS MT-
BUTTE/BLACKFOOT REGION MT-
227 PM MDT TUE AUG 9 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL GRANITE...
SOUTHEASTERN MISSOULA AND WEST CENTRAL POWELL COUNTIES UNTIL 300 PM
MDT...

AT 226 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 18
MILES WEST OF DRUMMOND...MOVING NORTH AT 35 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH
THIS STORM. VERY HEAVY RAIN IS ALSO EXPECTED.

LOCATIONS IMPACTED INCLUDE...
NIMROD...GREENOUGH...GARNET AND BEARMOUTH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4647 11342 4653 11367 4700 11349 4691 11312
TIME...MOT...LOC 2026Z 199DEG 38KT 4658 11351

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
302 PM MDT TUE AUG 9 2016

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

0206 PM     HAIL             1 E GRANTSDALE          46.20N 114.12W
08/09/2016  E1.00 INCH       RAVALLI            MT   TRAINED SPOTTER

            SOME HAIL SLIGHTLY BIGGER THAN QUARTERS.

&&

NWS MISSOULA MT
IRIS SYSTEM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
303 PM MDT TUE AUG 9 2016

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

0254 PM     HAIL             1 E GRANTSDALE          46.20N 114.12W
08/09/2016  E0.75 INCH       RAVALLI            MT   TRAINED SPOTTER

            .

&&

NWS MISSOULA MT
IRIS SYSTEM

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
311 PM MDT TUE AUG 9 2016

MTZ005-006-043-092145-
POTOMAC/SEELEY LAKE REGION MT-MISSOULA/BITTERROOT VALLEYS MT-
BITTERROOT/SAPPHIRE MOUNTAINS MT-
311 PM MDT TUE AUG 9 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL RAVALLI...
NORTHWESTERN GRANITE AND SOUTHEASTERN MISSOULA COUNTIES UNTIL 345 PM
MDT...

AT 310 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 14
MILES SOUTHEAST OF BONNER-WEST RIVERSIDE...OR 16 MILES SOUTHEAST OF
MISSOULA...MOVING NORTHEAST AT 35 MPH.

NICKEL SIZE HAIL WITH BRIEF HEAVY RAIN WILL BE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
CLINTON...QUIGLEY...POTOMAC...TURAH...GREENOUGH AND TWIN CREEKS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4656 11370 4666 11395 4711 11369 4694 11331
TIME...MOT...LOC 2110Z 208DEG 32KT 4668 11376