

640 

WWUS20 KWNS 022008

SEL9

SPC WW 022008

MTZ000-030300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 419

NWS STORM PREDICTION CENTER NORMAN OK

210 PM MDT THU JUN 2 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN MONTANA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 210 PM UNTIL

900 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 80

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

NORTHEAST OF GLASGOW MONTANA TO 15 MILES SOUTH SOUTHEAST OF MILES

CITY MONTANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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.



DISCUSSION...A LINE OF STRONG/SEVERE THUNDERSTORMS CURRENTLY EXTENDS

FROM EAST OF HVR TO WEST OF MLS.  THESE STORMS ARE ASSOCIATED WITH

STRONG LARGE SCALE FORCING MOVING ACROSS MT.  ACTIVITY WILL LIKELY

PERSIST AND TRACK NORTHEASTWARD ACROSS THE WATCH THROUGH THE EARLY

EVENING.  MODERATE INSTABILITY AND STRONG EFFECTIVE SHEAR WILL

PROMOTE A RISK OF SUPERCELLS CAPABLE OF LARGE HAIL AND 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 500. MEAN STORM

MOTION VECTOR 24035.





...HART

