AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PENDLETON OR 229 PM PST SAT FEB 15 2014 .SHORT TERM...TONIGHT THROUGH MONDAY NIGHT. A STORM SYSTEM WAS AFFECTING THE ENTIRE REGION WITH PERIODS OF RAIN. SOME SNOW DID FALL ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES EARLIER THAT COULD HAVE PRODUCED AN INCH IN SOME PLACES BUT HAS SINCE TURNED TO RAIN. HOWEVER COLDER AIR WILL WORK ITS WAY INTO THE AREA THIS EVENING AND PERIODS OF SNOW ARE EXPECTED AND A SNOW ADVISORY IS IN EFFECT FOR OUR EAST SLOPES OF THE WA CASCADES THROUGH TONIGHT AND INTO SUNDAY MORNING. ELSEWHERE RAIN SHOWERS ARE LIKELY AND PRESSURE GRADIENTS TIGHTEN LATER TONIGHT AND BREEZY TO WINDY CONDITIONS ARE POSSIBLE OVER AND NEAR THE COLUMBIA BASIN OVERNIGHT AND INTO SUNDAY MORNING. AS THE STORM SYSTEM DEPARTS SUNDAY DRIER CONDITIONS WILL COVER MOST OF THE REGION EXCEPT FOR THE AREA MOUNTAINS THAT INCLUDE THE CASCADES AND BLUE/WALLOWAS. ANOTHER STORM SYSTEM SUNDAY NIGHT WILL BRING BREEZY TO WINDY SOUTHWEST WINDS TO THE AREA. MEANWHILE SHOWERS WILL MOVE INTO THE WA/OR CASCADES AND PUSH EAST INTO THE REMAINDER OF THE AREA MONDAY AND MONDAY NIGHT. SNOW LEVELS WILL REMAIN HIGH AND ANY SNOW WILL BE CONFINED TO THE HIGHEST ELEVATIONS OF THE AREA MOUNTAINS. .LONG TERM...TUESDAY THROUGH SATURDAY NIGHT...A VERY MOIST WESTERLY FLOW TUESDAY WILL TRANSITION TO A NORTH WEST FLOW BY THURSDAY. SNOW LEVELS WILL BE AROUND 3000-4000 FT BEFORE THE FRONTAL PASSAGE. COLDER AIR MAY REMAIN TRAPPED ALONG THE EAST SLOPES OF THE CASCADES SO HAVE SNOW LEVELS AROUND 2000 FT FOR THAT AREA. BY WEDNESDAY MORNING SNOW LEVELS WILL BE DOWN TO 1500 FT BUT THE MOISTURE WILL BE MAINLY OVER THE MOUNTAINS AND WILL BE AS ALL SNOW. MODELS INDICATE THAT SOME AREAS COULD GET ENOUGH SNOW FOR HIGHLIGHTS...BUT TOO EARLY TO BE SPECIFIC. AS NORTHWEST FLOW SETS IN ON THURSDAY...DRIER AIR WILL INVADE THE AREA. MAINLY THE LOWER ELEVATIONS WILL BE DRY BUT PRECIPITATION SHOULD START TO TAPER OFF BY THE END OF THE WORK WEEK OVER THE MOUNTAINS. CURRENT FORECAST FOR FRIDAY AND SATURDAY STILL HAS CHANCE POPS OVER THE MOUNTAINS DUE TO UNCERTAINTY THAT THIS PROGRESSIVE WET PATTER WILL END. TEMPERATURE WISE FOR THURSDAY ONWARD...WITH THE NORTHWEST FLOW BEHIND THE COLD FRONT EXPECT THAT TEMPERATURES WILL BE FAIRLY COOL WITH HIGHS IN THE MID 30S TO LOWER 40S FOR THE LOWER ELEVATIONS AND IN THE MID 20S TO MID 30S MOUNTAINS. LOWS MAY BE IN THE LOW TEENS TO MID 20S...IF ENOUGH CLEARING OCCURS OVER THE MOUNTAINS ON FRIDAY AND SATURDAY...TEMPERATURES MAY EVEN GET DOWN INTO THE SINGLE DIGITS OVER THE MOUNTAINS.
Posted on: Sun, 16 Feb 2014 01:07:48 +0000
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