Special Weather Statement, NWS Missoula, MT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
235 PM MDT MON AUG 9 2010

.DISCUSSION...SOUTWESTERLY FLOW HAS USHERED A PLUME OF MOISTURE
WITHIN A SHORTWAVE TROUGH INTO THE REGION THIS AFTERNOON. SHOWERS AND
THUNDERSTORMS HAVE ALREADY FORMED THROUGH EAST CENTRAL IDAHO AND
SOUTHWEST MONTANA EARLY THIS AFTERNOON IN ASSOCIATION WITH THIS
TROUGH. SHOWER AND THUNDERSTORM COVERAGE WILL EXPAND NORTHWARD
THROUGH WESTERN MONTANA THIS AFTERNOON AND EVENING. EXPECTED
IMPACTS FOR STORMS ACROSS LEMHI COUNTY IDAHO WILL MAINLY BE SMALL
HAIL AND WIND. MEANWHILE...STORMS ACROSS SOUTHWEST AND CENTRAL
MONTANA WILL BE IMPACTED FROM ISOLATED STRONGER STORMS WITH SMALL
HAIL AND HEAVY RAINFALL. A FLASH FLOOD WATCH IS IN EFFECT FOR LOCALLY
HEAVY RAIN IN THESE AREAS UNTIL 10 PM MDT. THERE WILL BE ENOUGH
MOISTURE AND ENERGY OVERNIGHT TO KEEP A SLIGHT CHANCE FOR
LINGERING SHOWERS AND THUNDERSTORMS. A LOW PRESSURE SYSTEM WILL
CONTINUE TO DIG INTO THE PACIFIC NORTHWEST ON TUESDAY. AVAILABLE
MOISTURE FOR THIS DIGGING SYSTEM ON TUESDAY WILL BE SLIGHTLY
LOWER THAN TODAY AND CONDITIONS LOOK TO BE BETTER FOR STRONGER
THUNDERSTORMS WITH THE MAIN IMPACT FROM POTENTIAL HAIL. THIS LOW
PRESSURE SYSTEM WILL KEEP ITS HOLD ON WEDNESDAY WITH TEMPERATURES
SHOWING A COOLING TREND AND YET ANOTHER CHANCE FOR SHOWERS AND
THUNDERSTORMS BEFORE CLOSING ITSELF OFF EARLY WEDNESDAY.

THURSDAY AND FRIDAY...THE CLOSED UPPER LOW WILL LINGER OVER THE
NORTHERN ROCKIES AND PRODUCE SCATTERED RAIN SHOWERS AND COOL
TEMPERATURES ACROSS THE REGION. SOME RAINFALL AMOUNTS COULD BE
HEAVY. BY FRIDAY THE UPPER CLOSED LOW OPENS INTO A SHORT WAVE AND
BEGINS TO EXIT THE REGION LEAVING BEHIND COOL NORTHWESTERLY FLOW.

SATURDAY AND SUNDAY...HIGH PRESSURE BUILDS IN BEHIND THE EXITING
TROF. THIS HIGH IS EXPECTED TO BRING DRY WEATHER THIS COMING WEEKEND
WITH WARMING TEMPERATURES TO NEAR OR SLIGHTLY ABOVE NORMAL
READINGS IN THE MID AND UPPER 80S.

&&

.AVIATION...SCATTERED THUNDERSTORMS WILL CONTINUE TO FIRE ACROSS NORTH
CENTRAL IDAHO AND WEST CENTRAL MONTANA...FOCUSED MAINLY SOUTH OF
THE INTERSTATE 90 CORRIDOR...THROUGH THIS EVENING. SOME MORE
ISOLATED DEVELOPMENT MAY BE POSSIBLE NORTHWARD TOWARDS KGPI. MAIN
THREAT WITH THESE STORMS NEAR OR ACROSS THE AIRFIELDS WILL BE
PERIODS OF VERY HEAVY RAINFALL AND SOME SMALL HAIL. VISIBILITIES
COULD BE TEMPORARILY REDUCED FROM THE STORMS BOTH OVER THE
AIRFIELDS AND THE TERRAIN. SHOWER AND THUNDERSTORM ACTIVITY WILL
DIMINISH LATER INTO THE EVENING. ENERGY AND LIFT FROM ANOTHER
SHORTWAVE FROM THE PARENT TROUGH WILL SUPPORT MORE SHOWER AND
THUNDERSTORM DEVELOPMENT TUESDAY...FIRST IN THE MORNING ACROSS
NORTHWEST MONTANA THEN THE FOCUS SHIFTS ACROSS THE ENTIRE NORTHERN
ROCKY REGION.

&&

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

SHORT TERM...KITSMILLER
LONG TERM....RPN
AVIATION...NOLTE

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
142 PM MDT MON AUG 9 2010

IDZ006-092030-
SOUTHERN CLEARWATER MOUNTAINS-
1242 PM PDT MON AUG 9 2010

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL IDAHO COUNTY UNTIL 130 PM
PDT...

AT 1237 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM 22 MILES SOUTHEAST OF LOWELL...OR 34 MILES EAST
OF GRANGEVILLE...MOVING NORTHEAST AT 15 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THIS STORM...
ALONG WITH HEAVY RAIN.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...ELK CITY AND RURAL
AREAS OF CENTRAL IDAHO COUNTY.

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 4616 11520 4598 11495 4573 11541 4586 11559
TIME...MOT...LOC 1940Z 227DEG 15KT 4586 11540

WHITMORE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
228 PM MDT MON AUG 09 2010

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

0220 PM     HAIL             9 ESE GREENOUGH         46.87N 113.26W
08/09/2010  E0.88 INCH       POWELL             MT   TRAINED SPOTTER

            RELAYED REPORT FROM TRAINED SPOTTER OF DIME TO NICKEL
            SIZE HAIL THAT LASTED FOR 5 TO 6 MINS EAST OF LUBRECHT.

&&

NOLTE

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
340 PM MDT MON AUG 9 2010

IDZ005-006-092230-
NORTHERN CLEARWATER MOUNTAINS-SOUTHERN CLEARWATER MOUNTAINS-
240 PM PDT MON AUG 9 2010

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN CLEARWATER AND NORTHERN
IDAHO COUNTIES UNTIL 330 PM PDT...

AT 236 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 31 MILES EAST OF PIERCE...OR 46 MILES NORTHEAST
OF KAMIAH...MOVING NORTHEAST AT 35 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THIS STORM...
ALONG WITH HEAVY RAIN.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...POWELL AND HIGHWAY
12 FROM POWELL TO LOLO 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 4678 11492 4659 11464 4640 11516 4655 11530
TIME...MOT...LOC 2140Z 237DEG 32KT 4653 11511

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