AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PENDLETON OR 330 PM PST FRI JAN 2 2015 UPDATED AVIATION .SHORT TERM...TONIGHT THROUGH MONDAY AFTERNOON...A WEAK DISTURBANCE WILL MOVE ACROSS THE FORECAST AREA TONIGHT AND SATURDAY MORNING BRINGING LIGHT SNOW TO THE EAST SLOPES OF THE CASCADES AND THE EASTERN MOUNTAINS. THIS SYSTEM WILL BEGIN MOVING INTO EASTERN WASHINGTON THIS EVENING, THUS INTRODUCING SNOW IN THE NORTHERN BLUE MOUNTAINS WITHIN A FEW HOURS AFTER NIGHTFALL. THE SHORT WAVE MOVES SOUTHEAST THROUGH FAR NORTHEAST OREGON TONIGHT AND EXITS INTO IDAHO/MONTANA BY LATE SATURDAY MORNING. THE MOUNTAINS OF NORTHEAST OREGON AND THE BLUE MOUNTAINS IN SOUTHEAST WASHINGTON WILL RECEIVE LIGHT SNOW ACCUMULATIONS UP TO 2 INCHES WITH RIDGE TOPS ABOVE 5000 FEET POSSIBLY GET UP TO 3 INCHES. THE WALLOWA MOUNTAINS AND THE WALLOWA VALLEY WILL RECEIVE UP TO 2 INCHES OF SNOW TONIGHT AND SATURDAY MORNING. THE REGION WILL BE BETWEEN WEATHER SYSTEMS SATURDAY AFTERNOON/EVENING, EXCEPT FOR A CHANCE OF SNOW ALONG THE EAST SLOPES OF THE CENTRAL WASHINGTON CASCADES LATE SATURDAY EVENING AS A WARM FRONT DEVELOPS IN WASHINGTON. THE WARM FRONT DEVELOPS RAPIDLY OVER THE LOWER COLUMBIA BASIN, THE KITTITAS AND YAKIMA VALLEYS, THE FOOTHILLS OF THE BLUE MOUNTAINS AND THE BLUE MOUNTAINS. THESE AREAS WILL HAVE PERIODS OF LIGHT SNOW IN THE OVERNIGHT PERIOD PRIOR TO DAYBREAK SUNDAY. THERE IS A CHANCE OF FREEZING RAIN AND SLEET IN THE LOWER COLUMBIA BASIN AND ADJACENT VALLEYS IN CENTRAL WASHINGTON ON SUNDAY DUE TO A FRIGID ARCTIC AIR MASS REMAINING AT THE LOWEST ELEVATIONS IN THE LOWER COLUMBIA BASIN AND ADJACENT VALLEYS THROUGH SUNDAY NIGHT. SNOW LEVELS RISE SLOWLY DURING THE DAY ON SUNDAY MAINLY IN CENTRAL OREGON. THE WARM FRONT WILL REMAIN OVER THE AFOREMENTIONED AREAS THROUGH MONDAY FOR AN EXTENDED PERIOD OF RAIN AT TIMES AT LOWER ELEVATIONS IN THE LOWER COLUMBIA BASIN AND MAINLY SNOW IN THE MOUNTAINS THROUGH SUNDAY NIGHT. MOST SNOW ACCUMULATIONS WILL OCCUR FROM THE PREDAWN HOURS ON SUNDAY UNTIL AROUND DAYBREAK ON MONDAY WITH SNOW ACCUMULATIONS IN THE BLUE MOUNTAINS OF 6 TO 12 INCHES EXPECTED.
Posted on: Fri, 02 Jan 2015 23:51:02 +0000
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