HAZARDOUS WEATHER OUTLOOK
Issue Date: 503 AM PST WED NOV 25 2009
Expiration: 445 AM PST THU NOV 26 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.
.DAY ONE...TODAY AND TONIGHT
STRONG WIND
GRANDE RONDE VALLEY
A TIGHT PRESSURE AND TEMPERATURE GRADIENT CONTINUES TO PERSIST AND
STRENGTHEN BETWEEN THE BAKER AND GRANDE RONDE VALLEYS. THIS IS
EXPECTED TO CONTINUE THROUGH THE MORNING AND THEN THE GRADIENTS WILL
DECREASE IN THE AFTERNOON. AS A RESULT STRONG WINDS ARE OCCURRING IN
THE SOUTHERN GRANDE RONDE VALLEY...ESPECIALLY IN AND NEAR LADD AND
PYLES CANYONS. A WIND ADVISORY REMAINS IN EFFECT FOR THESE AREAS
THROUGH MID AFTERNOON UNTIL 3 PM PST. EXPECT WINDS OF 30 TO 40 MPH
WITH GUSTS TO 55 MPH IN AND NEAR LADD AND PYLES CANYONS...WITH WINDS
OF 20 TO 30 WITH GUSTS TO 45 MPH IN LA GRANDE AND THE NORTHERN PART
OF THE VALLEY. PLEASE REFER TO PDXNPWPDT FOR MORE DETAILS. THE WINDS
WILL DIMINISH BY LATE AFTERNOON AND OVERNIGHT TONIGHT.
THE DECREASING WIND WITH FEW CLOUDS WILL RESULT IN PATCHY FOG AND
FREEZING FOG IN THE LOWER COLUMBIA BASIN AND ADJACENT VALLEYS TO
DEVELOP OVERNIGHT...ESPECIALLY NEAR THE LARGER RIVERS SUCH AS THE
COLUMBIA AND YAKIMA RIVERS.
.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY
THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.
A WEAK WEATHER SYSTEM WILL MOVE THROUGH THE REGION FRIDAY NIGHT AND
THEN EXIT ON SATURDAY AND BE FOLLOWED BY HIGH PRESSURE ALOFT AGAIN.
THIS NEXT WEATHER SYSTEM WILL BRING ONLY MOSTLY LIGHT AMOUNTS OF
PRECIPITATION. THE UPPER RIDGE THAT FOLLOWS WILL PERSIST THROUGH
SUNDAY AND THEN ANOTHER WEATHER DISTURBANCE IS EXPECTED ON MONDAY.
THIS WILL BE FOLLOWED BY A COOLER NORTHERLY FLOW ON THE EAST SIDE OF
AN AMPLIFIED UPPER RIDGE OFF THE COAST WITH THIS SCENARIO PERSISTING
THROUGH THE LATTER HALF OF THE COMING WEEK.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUIRED.
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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