000 
WWUS85 KTFX 201035
SPSTFX

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
435 AM MDT MON JUN 20 2005

MTZ009>014-044>054-201800-
NORTHERN ROCKY MOUNTAIN FRONT-EASTERN GLACIER-HILL-CASCADE-
CHOUTEAU-CENTRAL AND SOUTHERN LEWIS AND CLARK-TOOLE-LIBERTY-
EASTERN PONDERA-BLAINE-SOUTHERN ROCKY MOUNTAIN FRONT-
EASTERN TETON-JUDITH BASIN-FERGUS-JEFFERSON-BROADWATER-MEAGHER-
INCLUDING THE CITIES OF...BROWNING...CUT BANK...HAVRE...
GREAT FALLS...FORT BENTON...HELENA...SHELBY...CHESTER...CONRAD...
CHINOOK...CHOTEAU...FAIRFIELD...STANFORD...LEWISTOWN...BOULDER...
TOWNSEND...WHITE SULPHUR SPRINGS
435 AM MDT MON JUN 20 2005

...ISOLATED SEVERE THUNDERSTORMS ARE EXPECTED LATE THIS AFTERNOON
AND THIS EVENING OVER PORTIONS OF CENTRAL AND SOUTHWEST MONTANA...

THE ATMOSPHERE WILL BECOME INCREASINGLY UNSTABLE TODAY ALONG AND
NORTH OF A WEAK SURFACE FRONTAL BOUNDARY. AS OF EARLY THIS
MORNING...THE FRONT EXTENDED ALONG A HELENA TO NEIHART TO
LEWISTOWN LINE. THE FRONT IS EXPECTED TO MOVE LITTLE THROUGHOUT
THE DAY. A WARM LAYER OF AIR IN THE MIDDLE LEVELS OF THE
ATMOSPHERE WILL INHIBIT THUNDERSTORM DEVELOPMENT THROUGH THE EARLY
AFTERNOON HOURS. BY LATE THIS AFTERNOON...A WEAK DISTURBANCE
APPROACHING FROM THE SOUTHWEST COMBINED WITH TEMPERATURES CLIMBING
INTO THE 80S WILL ALLOW FOR ISOLATED THUNDERSTORM DEVELOPMENT.
THUNDERSTORMS WILL INITIALLY DEVELOP OVER THE HIGHER TERRAIN OF
CENTRAL MONTANA NEAR OR JUST NORTH OF THE FRONTAL BOUNDARY. THE
STORMS ARE THEN EXPECTED TO MOVE EAST INTO AN INCREASINGLY
UNSTABLE ATMOSPHERE. ANY STORMS THAT DO DEVELOP WITH HAVE THE
POTENTIAL TO BECOME SEVERE...WITH THE MAIN THREATS BEING LARGE
HAIL AND DAMAGING STRAIGHT LINE WINDS. THE STORMS WILL THEN SHIFT
INTO EASTERN MONTANA BY LATER THIS EVENING.

ANYONE WHO HAS OUTDOOR ACTIVITIES PLANNED OVER NORTH CENTRAL OR
SOUTHWEST MONTANA THROUGH THIS EVENING SHOULD STAY TUNED TO NOAA
WEATHER RADIO OR LOCAL MEDIA FOR FURTHER UPDATES.

$$

SCHAUMANN