Special Weather Statement, NWS Great Falls, MT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREAT FALLS MT
229 PM MDT FRI JUL 24 2009

.DISCUSSION...
FRIDAY NIGHT THROUGH SUNDAY...
SHORT TERM FORECAST IS RATHER
UNSETTLED FOR THE NEXT FEW DAYS AS AN UPPER LEVEL LOW TRACKS INTO
NORTH IDAHO AND THEN STALLS OUT OVER THE WEEKEND. THE UPPER LEVEL
DIFFLUENCE ASSOCIATED WITH THIS SYSTEM IS GOING TO BE LOCATED OVER
MONTANA AND SHOULD ALLOW FOR ENHANCED LIFT OF STORMS OVER THE NEXT FEW
DAYS. THERE COULD BE SOME RESIDUAL SHOWERS THAT APPEAR OVERNIGHT
OVER THE NEXT FEW NIGHTS ASSOCIATED WITH THIS UPPER LEVEL SYSTEM.
THE SHOWERS AND THUNDERSTORMS SHOULD REMAIN ISOLATED TO SCATTERED
BUT WILL GENERALLY INITIATE OFF OF THE HIGHER TERRAIN DURING PEAK
HEATING. BY SUNDAY THE LOW WILL START TO MOVE OFF...UNFORTUNATELY
THE MODELS HAVE NOT BEEN IN AGREEMENT AT ALL ABOUT THE TRACK IT
WILL TAKE. HAVE LEFT PRECIP AT CHANCE FOR THIS DUE TO THE
UNCERTAINTY AND WILL MONITOR FOR CHANGES. SUK

SUNDAY NIGHT THROUGH WEDNESDAY NIGHT...MEDIUM RANGE MODELS IN BETTER
AGREEMENT FOR THE START OF THE PERIOD BUT QUICKLY DIVERGE WITH THE
DETAILS. BOTH THE EUROPEAN AND GFS START WITH A CLOSED LOW OVER THE
PACIFIC NORTHWEST AND SCATTERED THUNDERSTORMS OVER THE AREA. THE
CLOSED LOW QUICKLY FILLS AND OPENS INTO AN UPPER TROF MONDAY AND
THEN WEAKENS AS IT MOVES SOUTH. A BUILDING UPPER RIDGE OVER THE
WEST COAST AND A SLOW MOVING CLOSED UPPER LOW OVER EASTERN CANADA
WILL MAINTAIN AN UNSETTLED NORTHWEST FLOW ALOFT OVER THE AREA WITH
ISOLATED TO SCATTERED THUNDERSTORMS EACH DAY. TEMPERATURES WILL BE
NEAR SEASONAL AVERAGES.

THURSDAY AND FRIDAY...MODELS SHOW AN UPPER LEVEL RIDGE OF HIGH
PRESSURE OVER THE PACIFIC NORTHWEST DURING THE PERIOD FOR A MOSTLY
DRY AND WARM WEATHER PATTERN. EXCEPT FOR ISOLATED SHOWERS AND
AFTERNOON THUNDERSTORMS MAINLY OVER THE MOUNTAINS. WILLIAMSON DC
&&

.AVIATION...
UPDATED 1800Z.
A COMPACT UPPER LEVEL LOW PRESSURE SYSTEM CURRENTLY OVER NE WA WILL
DRIFT EAST AND STALL OVER NORTHERN ID DURING THE NEXT 24 HRS. THIS
WILL PROVIDE AN INCREASINGLY MOIST AND UNSTABLE SW FLOW ALOFT WHILE
EASTERLY FLOW REMAINS AT THE SURFACE. EXPECT SHOWERS AND
THUNDERSTORMS TO DEVELOP AND INCREASE IN COVERAGE THROUGH THIS
AFTERNOON WITH GREATEST COVERAGE INITIALLY ALONG THE CONTINENTAL
DIVIDE...SPREADING EAST INTO CENTRAL AND SW MT LATER THIS AFTERNOON
AND EVENING. AREA LEAST IMPACTED WILL BE THE KHVR TERMINAL WHERE
VFR CONDITIONS WILL PERSIST. VFR CONDITIONS WILL ALSO PREVAIL AT
REMAINING TERMINALS...HOWEVER LOCAL MVFR CONDITIONS ARE POSSIBLE
NEAR THUNDERSTORMS.

&&

.FIRE WEATHER...
LOW AFTERNOON HUMIDITIES ARE EXPECTED THROUGH THE WEEKEND...ALONG
WITH A CHANCE FOR THUNDERSTORMS. RIGHT NOW...MOST THUNDERSTORM
ACTIVITY LOOKS TO BE A BIT WET...SO HOPEFULLY ANY LIGHTNING STARTS
WILL BE ABLE TO BE PUT OUT QUICKLY. HOWEVER...ANY LIGHTNING
STRIKES THAT OCCUR WELL AWAY FROM THE PARENT STORM COULD BE A
PROBLEM ALONG WITH ERRATIC GUSTY OUTFLOWS FROM THE STORMS.
ADDITIONALLY SURFACE WINDS WILL BE FAIRLY LIGHT OVER THE NEXT FEW
DAYS...THUS NO FIRE WEATHER WATCH PLANNED FOR AT THIS TIME.

&&

.PRELIMINARY POINT TEMPS/POPS...
GTF  58  91  57  88 /  30  20  20  30
CTB  54  87  54  81 /  40  20  20  30
HLN  60  94  60  91 /  30  20  30  30
BZN  54  95  55  93 /  30  20  30  30
WEY  45  79  46  80 /  20  30  40  50
DLN  54  86  52  84 /  30  20  20  30
HVR  57  96  57  91 /  10  10  10  20
LWT  54  89  55  86 /  20  10  20  30

&&

.TFX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

SHORT TERM...SUK
LONG TERM...HOENISCH
AVIATION...HOENISCH

WEATHER.GOV/GREATFALLS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREAT FALLS MT
303 PM MDT FRI JUL 24 2009

MTZ008>010-012-014-015-046-048>050-052>055-252115-
BEAVERHEAD-NORTHERN ROCKY MOUNTAIN FRONT-EASTERN GLACIER-CASCADE-
CENTRAL AND SOUTHERN LEWIS AND CLARK-MADISON-EASTERN PONDERA-
SOUTHERN ROCKY MOUNTAIN FRONT-EASTERN TETON-JUDITH BASIN-
JEFFERSON-BROADWATER-MEAGHER-GALLATIN-
303 PM MDT FRI JUL 24 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
MONTANA...NORTH CENTRAL MONTANA AND SOUTHWEST MONTANA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SCATTERED THUNDERSTORMS WILL AFFECT THE REGION THROUGH TODAY. A
FEW STORMS COULD BE STRONG THIS AFTERNOON...WITH THE MAIN THREAT
BEING STRONG WINDS AND HAIL.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SCATTERED THUNDERSTORMS WILL AFFECT THE REGION THROUGH THE
WEEKEND. A FEW STORMS COULD BE SEVERE SATURDAY AND SUNDAY. THE
MAIN THREAT FROM THE STRONGER STORMS WILL BE DAMAGING WIND GUSTS
AND LARGE HAIL.

.SPOTTER INFORMATION STATEMENT...

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

MTZ011-013-044-045-047-051-252115-
HILL-CHOUTEAU-TOOLE-LIBERTY-BLAINE-FERGUS-
303 PM MDT FRI JUL 24 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MONTANA
AND NORTH CENTRAL MONTANA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 10 PM MDT TONIGHT.
SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WILL MOVE FROM THE
SOUTHWEST ACROSS MONTANA TO THE NORTH NORTHEAST...THE STRONGEST
STORMS MAY BE CAPABLE OF PRODUCING HAIL UP TO 1 INCH IN DIAMETER
AND WINDS IN EXCESS OF 60 MPH.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SCATTERED THUNDERSTORMS WILL AFFECT THE REGION THROUGH THE
WEEKEND. A FEW STORMS COULD BE SEVERE SATURDAY AND SUNDAY. THE
MAIN THREAT FROM THE STRONGER STORMS WILL BE DAMAGING WIND GUSTS
AND LARGE HAIL.

.SPOTTER INFORMATION STATEMENT...

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

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