AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PENDLETON OR 155 AM PDT WED MAR 12 2014 .SHORT TERM...TODAY THROUGH FRIDAY...A RIDGE OF HIGH PRESSURE WILL BE OVER THE REGION INTO THURSDAY FOR FAIR WEATHER WITH MILD DAYTIME TEMPERATURES. A RELATIVELY STRONG SHORTWAVE TROUGH WILL FLATTEN THE RIDGE LATE THURSDAY NIGHT AND FRIDAY AND DRIVE A COLD FRONT ACROSS THE REGION. RECENT MODEL RUNS HAVE STRENGTHENED THIS SYSTEM. THERE WILL BE A CHANCE FOR SHOWERS ON FRIDAY WITH THE FRONT AND IN THE UPSLOPE FLOW OVER THE EASTERN MOUNTAINS. SNOW LEVELS WILL BE ABOVE 5000 FEET SO MOST OF THE PRECIPITATION WILL BE IN THE FORM OF RAIN. RAINFALL AMOUNTS WILL NOT BE PARTICULARLY HEAVY SO NOT EXPECTING ANY HYDRO CONCERNS AT THIS TIME. IT WILL BE A BIT BREEZY FRIDAY AFTERNOON WITH THE FRONTAL PASSAGE. 78 .LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY...A QUICK MOVING WEATHER SYSTEM IS EXPECTED TO MOVE THROUGH THE AREA FRIDAY EVENING AND EXIT THE AREA BY SATURDAY MORNING. WEATHER IMPACTS FROM THIS SYSTEM AS IT EXITS INCLUDE BREEZY CONDITIONS FOR OUR WASHINGTON STATE ZONES AS WELL AS VALLEY RAIN AND MOUNTAIN SNOW ABOVE 4000 FEET. BY SATURDAY EVENING...A SHORTWAVE RIDGE WILL RAPIDLY MOVE ACROSS THE AREA WITH ANOTHER WEATHER SYSTEM COMING ASHORE. A COLD FRONT ASSOCIATED WITH THIS SYSTEM WILL APPROACH THE REGION WITH A SOUTHWEST MOISTURE FETCH AHEAD OF IT. LATEST ECMWF GUIDANCE SUGGESTS THIS INITIAL MOISTURE PLUME WILL GO MAINLY OVER THE WASHINGTON CASCADES...WHILE ALL OTHER MODEL GUIDANCE KEPT THE MOISTURE FURTHER NORTH. AS ALL MODEL SOLUTIONS DO AGREE ON THE COLD FRONT ASSOCIATED WITH THIS SYSTEM PASSING OVER THE REGION BY MONDAY MORNING...HAVE OPTED TO REFLECT THIS TREND IN THE GRIDS WITH A GRADUAL NORTHWEST TO SOUTHEAST INCREASE IN PRECIPITATION CHANCES. IN ADDITION...BREEZY CONDITIONS MAY OCCUR AHEAD OF AND COINCIDENT WITH THE COLD FRONT AS IT MOVES ACROSS THE REGION. THE LOW PRESSURE SYSTEM AND ASSOCIATED FRONTAL BOUNDARY IS EXPECTED TO EXIT THE REGION BY TUESDAY MORNING FOLLOWED BY A HIGH AMPLITUDE SHORT WAVE RIDGE TO CLOSE OUT THE FORECAST PERIOD. HIGH TEMPERATURES ARE PROGGED TO BE IN THE UPPER 50S TO UPPER 60S FOR THE LOWER COLUMBIA BASIN THROUGH SUNDAY BEFORE DROPPING INTO THE LOWER 50S TO LOWER 60S FOR TUESDAY AND WEDNESDAY. HIGH TEMPERATURES FOR THE HIGHLANDS AND MOUNTAINS ARE EXPECTED TO BE IN THE LOWER 50S TO LOWER 60S THROUGH SUNDAY BEFORE DROPPING INTO THE UPPER 40S TO MID 50S FOR TUESDAY AND WEDNESDAY.
Posted on: Wed, 12 Mar 2014 14:28:04 +0000
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