SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 709
   NWS STORM PREDICTION CENTER NORMAN OK
   1230 PM PDT WED AUG 4 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          CENTRAL AND NORTHEAST OREGON
          SOUTHEAST WASHINGTON
   
   EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1230 PM UNTIL
   800 PM PDT.
   
   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 ALONG AND 70 STATUTE MILES
   EAST AND WEST OF A LINE FROM 30 MILES NORTH NORTHWEST OF WALLA
   WALLA WASHINGTON TO 50 MILES SOUTHEAST OF REDMOND OREGON.
   
   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 706...WW 707...WW 708...
   
   DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING
   THE NEXT COUPLE OF HOURS OVER THE HIGHER TERRAIN OF CENTRAL
   ORE...SPREADING NORTHEASTWARD INTO SOUTHERN WA LATER THIS AFTERNOON.
    COOL TEMPERATURES ALOFT...MODERATE INSTABILITY...AND SUFFICIENT
   VERTICAL SHEAR WILL PROMOTE A RISK OF LARGE HAIL AND DAMAGING WINDS
   IN STRONGER CELLS.
   
   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 23030.
   
   
   ...HART