HAZARDOUS WEATHER OUTLOOK
Issue Date: 1203 PM PST SAT DEC 19 2009
Expiration: 615 AM PST SUN DEC 20 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.
.DAY ONE...TONIGHT
DENSE FOG
KITTITAS VALLEY, YAKIMA VALLEY
STRONG WIND
GRANDE RONDE VALLEY
PATCHY FOG WILL CONTINUE ACROSS AND SOUTHEAST WASHINGTON AND NORTH
CENTRAL AND NORTHEAST OREGON. THE KITTITAS AND YAKIMA VALLEYS WILL
STILL BE UNDER A DENSE FOG ADVISORY AS VISIBILITY WILL BE LESS THAN
ONE QUARTER OF A MILE AT TIMES.
PRESSURE GRADIENTS CONTINUE TO TIGHTEN ACROSS THE GRANDE RONDE
VALLEY AND ARE EXPECTED TO BE STRONGER TONIGHT...SO HAVE ISSUED A
WIND ADVISORY THROUGH LATE TOMORROW MORNING. PLEASE REFER TO PRODUCT
PDXNPWPDT FOR FURTHER DETAILS.
.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY
DENSE FOG SUNDAY
KITTITAS VALLEY, YAKIMA VALLEY
STRONG WIND SUNDAY
GRANDE RONDE VALLEY
AREAS OF DENSE FOG ARE EXPECTED TO DISSIPATE BY LATE MORNING AS AN
UPPER LEVEL SHORT WAVE WILL MOVES INTO THE AREA...BRINGING
WIDESPREAD RAIN TO MOST AREAS AND SNOW TO ELEVATIONS ABOVE 7000
FEET. THIS WILL ALSO BRING A WEAK COLD FRONT THROUGH THE FORECAST
AREA ON SUNDAY HELPING TO PUSH LOW LEVEL FOG AND CLOUDS OUT OF THE
VALLEYS.
WINDS ARE EXPECTED TO CONTINUE ACROSS THE GRANDE RONDE VALLEY...AS
PRESSURE GRADIENTS REMAIN TIGHT SUNDAY MORNING.
A MID/UPPER LEVEL TROUGH WILL MOVE INLAND ON MONDAY AND USHER IN
ANOTHER...STRONGER COLD FRONT MONDAY AFTERNOON...WHICH THEN MOVES
THROUGH THE REGION MONDAY EVENING. THE FRONT SHOULD WEAKEN AS IT
ENCOUNTERS A SPLIT FLOW ALOFT. THUS...THIS SYSTEM DOES NOT APPEAR
TO BE A BIG SNOW PRODUCER.
HIGH PRESSURE IS EXPECTED TO MOVE ACROSS THE FORECAST AREA BEGINNING
TUESDAY AND CONTINUING THROUGH THE REMAINDER OF THE WORK WEEK FOR
DRIER CONDITIONS. FOG AND LOW CLOUDS WILL BE THE MAIN CONCERN LATE
TUESDAY THROUGH FRIDAY.
.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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