HAZARDOUS WEATHER OUTLOOK
Issue Date: 243 PM PDT WED SEP 8 2010
Expiration: 715 AM PDT THU SEP 09 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.

.DAY ONE...TONIGHT

THUNDERSTORMS
     EAST SLOPES OF THE CENTRAL CASCADES OF WASHINGTON, EAST SLOPES
     OF THE SOUTHERN CASCADES OF WASHINGTON, EASTERN COLUMBIA RIVER
     GORGE OF WASHINGTON, KITTITAS VALLEY, YAKIMA VALLEY, LOWER
     COLUMBIA BASIN OF WASHINGTON, FOOTHILLS OF THE BLUE MOUNTAINS
     OF WASHINGTON, NORTHWEST BLUE MOUNTAINS OF WASHINGTON, EASTERN
     COLUMBIA RIVER GORGE OF OREGON, NORTH CENTRAL OREGON, CENTRAL
     OREGON, LOWER COLUMBIA BASIN OF OREGON, GRANDE RONDE VALLEY,
     WALLOWA COUNTY, FOOTHILLS OF THE BLUE MOUNTAINS OF OREGON,
     NORTHERN BLUE MOUNTAINS OF OREGON, SOUTHERN BLUE MOUNTAINS OF
     OREGON, NORTHERN WHEELER AND SOUTHERN GILLIAM COUNTIES, JOHN
     DAY BASIN, OCHOCO-JOHN DAY HIGHLANDS

A TROUGH OF LOW PRESSURE REMAINS OVER THE AREA TODAY PRODUCING
SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS. THUNDERSTORMS ARE NOT
EXPECTED TO BE STRONG OR SEVERE BUT MAY PRODUCE BRIEF HEAVY RAIN.
EXPECT THAT THUNDER WILL ONLY CONTINUE THROUGH 8PM TONIGHT...FROM
THEN ON BEING JUST SHOWERS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THUNDERSTORMS THURSDAY
     GRANDE RONDE VALLEY, WALLOWA COUNTY

AS THE TROUGH AXIS SLIDED FURTHER EAST THERE SHOULD BE ENOUGH
INSTABILITY FOR SHOWERS ACROSS NORTHEAST OREGON AND SOUTHWEST
WASHINGTON. ISOLATED THUNDER MAY OCCUR IN WALLOWA COUNTY UNTIL ABOUT
5PM. BY THEN THE TROUGH AXIS SHOULD BE EAST OF WALLOWA COUNTY AND
THE THREAT FOR ANY THUNDER WILL BE OVER.

WITH THE UPPER LEVEL RIDGE BUILDING IN THURSDAY EVENING...SKIES WILL
BEGIN TO CLEAR OUT.  ALREADY COOL TEMPERATURES ACROSS CENTRAL AND
NORTHEAST OREGON COMBINED WITH STRONG RADIATIONAL COOLING MAY RESULT
IN WIDESPREAD AREAS OF SUB-FREEZING TEMPERATURES. PLEASE REFER TO
PDXSPSPDT FOR FURTHER DETAILS.

SHOWER ACTIVITY SHOULD BE MINIMAL THROUGHOUT THE REMAINDER OF THE
WEEKEND AND EARLY WORK WEAK...WITH ONLY A SLIGHT CHANCE OF SHOWERS
ACROSS NORTHEAST OREGON ON TUESDAY...DUE TO UPSLOPE FLOW. ALSO A
SLIGHT CHANCE OF SHOWER ALONG THE CASCADE CREST...DUE TO SPILL OVER.

.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.