HAZARDOUS WEATHER OUTLOOK
Issue Date: 915 AM PST TUE NOV 24 2009
Expiration: 615 AM PST WED NOV 25 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.
.DAY ONE...REST OF TODAY AND TONIGHT
STRONG WIND
GRANDE RONDE VALLEY
A TIGHT PRESSURE GRADIENT OVER NORTHEAST OREGON IS CREATING VERY
WINDY CONDITIONS IN THE GRANDE RONDE VALLEY...MAINLY NEAR LADD AND
PYLES CANYONS. SOUTH WINDS 25 TO 35 MPH WITH GUSTS TO 45 MPH WILL
CONTINUE THROUGH EARLY WEDNESDAY MORNING THEN WILL INCREASE EVEN
MORE ON WEDNESDAY. A WIND ADVISORY HAS BEEN ISSUED FOR THE GRANDE
RONDE VALLEY. DETAILS CAN BE FOUND IN THE NWS PRODUCT PDXNPWPDT.
A WEAK WEATHER DISTURBANCE WILL CROSS THE PACIFIC NORTHWEST THIS
MORNING AND EXIT THE REGION BEGINNING LATE THIS AFTERNOON AND
TONIGHT. THERE WILL BE ISOLATED TO SCATTERED SHOWERS THIS MORNING
DECREASING THIS AFTERNOON...ESPECIALLY OVER THE MOUNTAINS.
.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY
STRONG WIND WEDNESDAY
GRANDE RONDE VALLEY
THE WIND ADVISORY REMAINS IN EFFECT FOR THE GRANDE RONDE VALLEY
THROUGH WEDNESDAY AFTERNOON. THE ADVISORY MAY BE EXPECTED INTO
THANKSGIVING DAY...AS SURFACE PRESSURE GRADIENTS REMAIN TIGHT IN
NORTHEAST OREGON THE NEXT SEVERAL DAYS.
HIGH PRESSURE ALOFT WITH LIGHT WINDS WILL DEVELOP OVER MOST OF THE
REGION. THIS WILL CAUSE VALLEY AND COLUMBIA BASIN INVERSIONS TO
DEVELOP BY WEDNESDAY AND CONTINUE THROUGH THE MORNING OF
THANKSGIVING DAY. ANOTHER WEATHER SYSTEM WILL THEN APPROACH THE
REGION LATER IN THE DAY THANKSGIVING INTO FRIDAY WITH ANOTHER CHANCE
OF PRECIPITATION. UNSETTLED CONDITIONS WILL PERSIST INTO SATURDAY
AND THEN ANOTHER UPPER RIDGE WITH DRIER CONDITIONS WILL BUILD OVER
THE REGION ON SUNDAY AND MONDAY.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUIRED FOR WINDS IN THE GRANDE RONDE
VALLEY.
WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
GRAPHICAL FORECASTS OF WEATHER HAZARDS OUT TO SEVEN DAYS
ARE DISPLAYED ON THE WORLD WIDE WEB AT:
WWW.WRH.NOAA.GOV/PDT/CURRENTHAZARDS/HWO.HTML
ALL LETTERS IN THE ABOVE URL ARE LOWER CASE...EXCEPT THE H IN
CURRENTHAZARDS.
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