

000 

WWUS20 KWNS 292018

SEL4

SPC WW 292018

MTZ000-300500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 464

NWS STORM PREDICTION CENTER NORMAN OK

220 PM MDT FRI JUN 29 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTH CENTRAL MONTANA



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 220 PM UNTIL

1100 PM MDT.



HAIL TO 2.5 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 105

STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES EAST

NORTHEAST OF CUT BANK MONTANA TO 60 MILES SOUTH SOUTHEAST OF

GREAT FALLS MONTANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 463...



DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO INTENSIFY THIS

AFTERNOON AND EVENING OVER THE MOUNTAINS OF WEST CENTRAL MT AND

SPREAD EAST-NORTHEASTWARD TOWARD THE CANADIAN BORDER.  DEWPOINTS IN

THE LOWER 60S AND MLCAPE VALUES OVER 2000 J/KG...ALONG WITH

INCREASING DEEP LAYER VERTICAL SHEAR PROFILES WILL PROMOTE A RISK OF

SUPERCELLS CAPABLE OF VERY LARGE HAIL AND DAMAGING WINDS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 25030.





...HART

