Severe Thunderstorm Warning 67, NWS Glasgow, MT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
140 PM MDT TUE JUN 21 2005

.SHORT TERM...FOR NORTHEAST MONTANA TONIGHT THROUGH THURSDAY...
ACTIVE BEGINNING TO SHORT TERM PERIOD WITH ANOTHER ROUND OF SEVERE
WEATHER TONIGHT. VERY UNSTABLE ATMOSPHERE CONTINUES ACROSS NORTHEAST
MONTANA WITH SURFACE DEW POINTS IN THE 60S AND 70S ACROSS MOST AREAS
THIS AFTERNOON. FIRST ORDER OF BUSINESS IS RATHER PERSISTENT
SUPERCELL JUST NORTH OF PHILLIPS COUNTY. SHOULD CONTINUE TO PUSH
ALONG THE CANADIAN BORDER INTO THE EVENING AND POSSIBLY SPARK
ADDITIONAL STORMS SO WILL UP POPS ACROSS THE FAR NORTH. LOW
CONFIDENCE ON IMPACT CELL WILL HAVE ACROSS THE REST OF THE NORTHERN
COUNTIES FOR THE REST OF THE AFTERNOON. WILL KEEP ISOLATED POPS
NORTH OF THE MISSOURI RIVER. IT APPEARS THAT MAIN THREAT FOR SEVERE
WX WILL BE ASSOCIATED WITH CONVECTION CURRENTLY INITIATING OFF
HIGHER TERRAIN OF SW MONTANA IN RESPONSE TO WAVE PUSHING NORTH. BEST
CHANCES FOR THIS ACTIVITY WILL BE ACROSS WESTERN ZONES WHERE HIGHEST
THREAT OF SEVERE STORMS ALSO RESIDES AND HAVE UPPED POPS HERE. WILL
SPREAD POPS ACROSS ENTIRE AREA AFTER MIDNIGHT IN CASE MCS DEVELOPS
AND MOVES ACROSS NORTHEAST MONTANA AGAIN...BUT WITH RIDGE OVER THE
AREA FAR SOUTHEAST MAY STAY CAPPED AND THEREFORE DRY.

INTO WEDNESDAY FRONT APPROACHES THE AREA WITH STRONG THERMAL RIDGE
BUILDING ACROSS NORTHEAST MONTANA. WITH WINDS SWITCHING TO THE WEST
IN THE AFTERNOON SHOULD SEE THINGS MIX OUT WELL...WITH HIGHS WELL
INTO THE 90S MOST AREAS. WILL LIKELY SEE ANOTHER ROUND OF
THUNDERSTORMS TOMORROW AFTERNOON/EVENING AS THINGS INITIATE OFF
HIGHER TERRAIN...THEN SPREAD EAST OVERNIGHT. INHERITED FORECAST HAS
HANDLE ON THIS SO WILL NOT MAKE TOO MANY CHANGES. WILL HOLD OFF ON
SEVERE MENTION FOR NOW TO FOCUS ON TONIGHT AND LET NEXT SHIFT
RE-EVALUATE. BEHIND COLD FRONT THURSDAY EXPECT MUCH COOLER
TEMPERATURES WITH HIGHS ONLY AROUND 80 MOST AREAS. MAY SEE A FEW
SHOWERS/STORMS ACROSS NORTHEAST WITH WAVES MOVING THROUGH FLOW...BUT
THURSDAY WILL LIKELY BE FIRST DAY WITHOUT SEVERE WEATHER IN A WHILE.
JJZ

.LONG TERM...THURSDAY NIGHT THROUGH TUESDAY...
LITTLE CHANGE IN THE FORECAST WITH MODELS NOT STRAYING MUCH FROM
PREVIOUS SOLUTIONS. MOIST SOUTHWEST FLOW CONTINUES TO BRING
POSSIBILITY OF THUNDERSTORMS EACH DAY. COULD BE SLIGHT BREAK IN THE
ACTIVITY EARLY IN THE PERIOD AS SHORTWAVE TROF SKIMS ACROSS WESTERN
CANADA ON THURSDAY. BY FRIDAY...COOLER...MORE STABLE HIGH PRESSURE
WILL SLIDE INTO MONTANA. GIVEN THE PATTERN OF THE PAST WEEK OR SO
WOULD NOT COMPLETELY RULE OUT THE POSSIBILITY OF THUNDERSTORMS.
SOUTHWEST FLOW OPENS BACK UP OVER THE WEEKEND WITH RIDGE AXIS TO THE
EAST. THIS WILL INCREASE THE THUNDERSTORM POTENTIAL BUT STILL
SOMEWHAT CONDITIONAL ON SHORTWAVE ENERGY. EBERT

&&

AVIATION...
VFR UNTIL EVENING WHEN STORMS MAY DROP ANY SITE TO IFR OR LIFR.

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE.

&&

WEATHER.GOV/GLASGOW

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GLASGOW MT
555 AM MDT TUE JUN 21 2005

MTZ016>027-059>062-221200-
CENTRAL AND SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY-
DANIELS-SHERIDAN-WESTERN ROOSEVELT-PETROLEUM-GARFIELD-MCCONE-
RICHLAND-DAWSON-PRAIRIE-WIBAUX-NORTHERN PHILLIPS-
SOUTHWEST PHILLIPS-NORTHERN VALLEY-EASTERN ROOSEVELT-
555 AM MDT TUE JUN 21 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST
MONTANA.

.DAY ONE...TODAY AND TONIGHT

ISOLATED TO WIDELY SCATTERED THUNDERSTORMS ARE EXPECTED TODAY AND
TONIGHT ACROSS THE AREA. SOME STORMS WILL LIKELY BECOME SEVERE AND
PRODUCE DAMAGING WIND AND LARGE HAIL. ISOLATED TORNADOES ARE ALSO
POSSIBLE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

ISOLATED TO WIDELY SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP
ACROSS THE AREA DURING THE LATE AFTERNOON OR EARLY EVENING HOURS
AND PERSIST INTO THE OVERNIGHT HOURS WEDNESDAY THROUGH SUNDAY.
SOME OF THESE STORMS WILL LIKELY BECOME SEVERE...PRODUCING
DAMAGING WIND AND LARGE HAIL. ISOLATED TORNADOES ARE ALSO
POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.