Thursday, September 5, 2013

WATCHES: Severe Thunderstorm Watch Number 511

WWUS20 KWNS 051936
SEL1
SPC WW 051936
IDZ000-NVZ000-ORZ000-WAZ000-060300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 511
NWS STORM PREDICTION CENTER NORMAN OK
1235 PM PDT THU SEP 5 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN AND WESTERN IDAHO
NORTHEAST NEVADA
THE EASTERN TWO-THIRDS OREGON
SOUTHERN WASHINGTON

* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1235 PM
UNTIL 800 PM PDT.

* PRIMARY THREATS INCLUDE...
SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 75
MPH POSSIBLE
SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2
INCHES IN DIAMETER POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 125
STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHEAST OF
WALLA WALLA WASHINGTON TO 65 MILES SOUTH SOUTHWEST OF ROME
OREGON. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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...THUNDERSTORMS CONTINUE TO GRADUALLY DEVELOP THIS
AFTERNOON ACROSS PORTIONS OF OREGON AND VICINITY...AS AN UPPER LOW
AND ASSOCIATED/POTENT MID-LEVEL SPEED MAX SHIFTS NEWD INTO THE
REGION. A MOIST LOW-LEVEL AIRMASS CONTINUES TO HEAT/DESTABILIZE
THIS AFTERNOON...WHICH WILL SUPPORT CONTINUED/INCREASINGLY
WIDESPREAD STORM DEVELOPMENT. GIVEN THE INCREASING FLOW
ALOFT...STORMS WILL ORGANIZE QUICKLY...WITH INITIALLY ROTATING CELLS
POSSIBLY GROWING UPSCALE INTO SMALL-SCALE LINES WITH TIME. AS
SUCH...LARGE HAIL AND LOCALLY DAMAGING WINDS ARE EXPECTED ACROSS
THIS REGION INTO THE EVENING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 20040.


...GOSS

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