

843 

WWUS20 KWNS 041949

SEL2

SPC WW 041949

IDZ000-MTZ000-ORZ000-WAZ000-050700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 352

NWS STORM PREDICTION CENTER NORMAN OK

1245 PM PDT MON JUN 4 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF IDAHO

       WESTERN MONTANA

       EASTERN OREGON

       EASTERN WASHINGTON



EFFECTIVE THIS MONDAY FROM 1245 PM UNTIL MIDNIGHT PDT.



HAIL TO 1.5 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 NORTHWEST OF

KALISPELL MONTANA TO 55 MILES SOUTHEAST OF ROME OREGON.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU2).



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 351...



DISCUSSION...POTENT MID/UPR LEVEL DISTURBANCE AND 70-100KT MID LEVEL

SPEED MAX CURRENTLY CROSSING NRN CA WILL TRANSLATE NEWD ACROSS PARTS

OF OR/WA/ID THROUGH LATE TONIGHT. RESULTING DYNAMIC LIFT WITH THIS

IMPULSE WILL ACT TO ENHANCE CONVECTIVE DEVELOPMENT ALONG A

WELL-ESTABLISHED AND STRENGTHENING N-S BAROCLINIC ZONE SITUATED

ACROSS ERN OR/WA. ORGANIZED FAST-MOVING TSTMS IN THE FORM OF

SUPERCELLS AND/OR LONGER-LIVED LINE SEGMENTS SHOULD EVOLVE AS

GREATER FORCING COINCIDES WITH STRONGER DIURNAL DESTABILIZATION

ACROSS THE REGION OVER THE NEXT SEVERAL HOURS. SOME OF THE MORE

ROBUST/ORGANIZED ELEMENTS OF CONVECTION COULD PRODUCE SEVERE HAIL

WHILE MOST OF THE STORMS MOVE NNEWD AT SPEEDS OF 50-60KT AND POSE A

THREAT OF DAMAGING WINDS.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 350. MEAN STORM

MOTION VECTOR 19050.





...CARBIN

