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393 

WWUS20 KWNS 141927

SEL3

SPC WW 141927

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 303

NWS STORM PREDICTION CENTER NORMAN OK

130 PM MDT SAT MAY 14 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF EASTERN OREGON



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 130 PM UNTIL

800 PM MDT.



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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH OF

PENDLETON OREGON TO 40 MILES SOUTH OF ROME OREGON.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU3).



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 302...



DISCUSSION...AHEAD OF STRONG UPPER TROUGH OFF OR COAST...WIND FIELDS

HAVE INCREASED AS WELL AS INSTABILITY.  THUNDERSTORMS DEVELOPING

OVER HIGHER TERRAIN OF ERN OR WILL INTENSIFY AND INCREASE IN NUMBER

THROUGH THE AFTERNOON.  PRIMARY THREAT WILL BE MULTICELLULAR STORMS

RESULTING IN LARGE HAIL AND LOCAL DOWNBURST 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 500. MEAN STORM

MOTION VECTOR 18025.





...HALES

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