SEL8
SPC WW 242053
MTZ000-250400-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 618
NWS STORM PREDICTION CENTER NORMAN OK
245 PM MDT FRI JUL 24 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN MONTANA
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 245 PM UNTIL
1000 PM MDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH OF
KALISPELL MONTANA TO 20 MILES SOUTHEAST OF DILLON MONTANA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU8).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 616...WW 617...
DISCUSSION...UPPER LOW OVER ERN WA WAS RESULTING IN STRONGLY
DIFFLUENT FLOW ALOFT ACROSS WRN MT. THE STORMS ARE EXPECTED TO
DEVELOP NWWD AND ALSO INTENSIFY THROUGH THE EVENING HOURS. ALTHOUGH
INSTABILITY IS NOT PARTICULARLY STRONG...MLCAPES AROUND 1000
J/KG...DEEP LAYER SHEAR NEAR 40 KT AND THE STRONG FORCING SHOULD
SUPPORT A FEW SUPERCELLS WITH THE POTENTIAL FOR LARGE HAIL AND ALSO
DAMAGING WINDS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 24020.
...IMY
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