Possible lowland winter storm event early next week...

posted Nov 26, 2013, 9:42 PM by smike@guemesfire.org
345 PM PST TUE NOV 26 2013

..HEAVY SNOWFALL IS POSSIBLE IN THE MOUNTAINS BEGINNING LATE SATURDAY NIGHT OR SUNDAY...
..A CHANGE TO MUCH COLDER WEATHER IS EXPECTED THROUGHOUT WESTERN WASHINGTON SUNDAY NIGHT THROUGH EARLY NEXT WEEK...

WEATHER FORECAST MODELS ARE SHOWING A BIG CHANGE IN THE WEATHER PATTERN STARTING SATURDAY NIGHT OR EARLY SUNDAY AND CONTINUING THROUGH MUCH OF NEXT WEEK.

A STRONG PACIFIC FRONTAL SYSTEM WILL MOVE THROUGH THE AREA LATE SATURDAY NIGHT AND SUNDAY. THE BIGGEST IMPACT OF THIS STORM WILL BE IN THE MOUNTAINS. SNOW LEVELS AROUND 5000 FEET LATE SATURDAY NIGHT OR EARLY SUNDAY WILL RAPIDLY FALL TO BELOW 2000 FEET BY SUNDAY EVENING AND TO BELOW 500 FEET LATESUNDAY NIGHT. SNOWFALL AMOUNTS IN THE PASSES WILL LIKELY BE QUITE HEAVY. SATURDAY WILL BE A MUCH BETTER TRAVEL DAY THROUGH THE PASSES THAN SUNDAY.

A VERY COLD ARCTIC AIR MASS IS EXPECTED TO DEVELOP OVER THE YUKON SATURDAY NIGHT INTO SUNDAY THEN DROP SOUTHWARD INTO BRITISH COLUMBIA LATE SUNDAY INTO MONDAY. THERE IS AN INCREASINGLY GOOD CHANCE THAT SOME OF THIS COLD AIR WILL MOVE INTO WESTERN WASHINGTON ON MONDAY.

DETAILS ARE DIFFICULT TO PINPOINT AS WE ARE STILL DAYS OUT FROM THIS POTENTIAL EVENT. BUT WITH THIS TYPE OF SYSTEM...IT IS LIKELY THAT THERE WILL BE SOME LOWLAND SNOW WITH THE PASSAGE OF THE MODIFIED ARCTIC COLD FRONT. IT ALSO APPEARS LIKELY THAT IT WILL GET QUITE WINDY IN THE NORTH INTERIOR...ESPECIALLY AROUND THE SAN JUANS AND IN THE LOWER FRASER VALLEY AROUND BELLINGHAM. IT MAY STAY BELOW FREEZING FOR A COUPLE OF DAYS AFTER MONDAY. LOWLAND SNOW...IF IT OCCURS...MAY GIVE DICEY TRAVEL ACROSS PORTIONS OF THE WESTERN WASHINGTON LOWLANDS MONDAY.

FORECASTS ARE LIKELY TO CHANGE AS WE GET CLOSER TO THE EVENT FOR LATER THIS WEEKEND INTO EARLY NEXT WEEK. EVERYONE SHOULD CLOSELY MONITOR LATEST FORECASTS.
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