“Pineapple express” to arrive this weekend

January 10, 2013 9:15 pmComments OffViews: 8
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE
ANCHORAGE AK 400 PM AKST THU JAN 10 2013
AKZ101-111-121-125-131-135-145-111400- …
WIND AND RAIN WILL MOVE INTO SOUTH CENTRAL ALASKA THIS WEEKEND… A SHIFT IN THE WEATHER PATTERN WILL BRING A STRONG WEATHER FRONT INTO SOUTH CENTRAL ALASKA THIS WEEKEND. THE FRONT SHOULD MOVE INTO THE COOK INLET AND SUSITNA VALLEY REGION DURING THE MORNING ON SATURDAY AND PUSH EASTWARD OVER PRINCE WILLIAM SOUND AND THE COPPER RIVER BASIN BY SATURDAY EVENING. THIS FRONT HAS A TROPICAL CONNECTION WITH IT AND THEREFORE WILL BRING IN UNSEASONABLY WARM AIR TO THE AREA. A SECONDARY LOW WILL DEVELOP ALONG THE FRONT SUNDAY AND IMPACT SOUTH CENTRAL ALASKA SUNDAY NIGHT INTO MONDAY. ON THE KENAI PENINSULA THE PRECIPITATION SHOULD BEGIN AS SNOW ON SATURDAY BUT THEN TRANSITION INTO RAIN FROM THE SOUTH AS THE DAY PROGRESSES. THE ANCHORAGE AREA IS EXPECTED TO HAVE SOME LIGHT SNOW ON SATURDAY THAT WILL BEGIN TO MIX WITH FREEZING RAIN LATE IN THE AFTERNOON. THE FREEZING RAIN WILL TURN TO STRAIGHT RAIN AS TEMPERATURES WARM THROUGH THE NIGHT SATURDAY NIGHT AND RISE ABOVE FREEZING. RAIN WILL THEN PERSIST INTO MONDAY MORNING…WITH THE HEAVIEST RAIN SUNDAY NIGHT. STRONG SOUTHEAST WINDS ARE EXPECTED TO OCCUR ALONG TURNAGAIN ARM AND THE HIGHER ELEVATIONS FROM SATURDAY NIGHT INTO MONDAY WITH THIS SYSTEM. THE ANCHORAGE BOWL WILL LIKELY NOT SEE STRONG WINDS UNTIL THE SECONDARY LOW MOVES THROUGH THE AREA SUNDAY AFTERNOON INTO MONDAY MORNING. THE TIMING OF THE WIND IS VERY DEPENDENT ON THE STRENGTH AND TIMING OF THE SECONDARY LOW ALONG THE FRONT. THERE IS UNCERTAINTY IN THESE AREAS AND THEREFORE THE TIMING OF THE STRONGEST WIND AND RAIN MAY NEED TO BE ADJUSTED AS THE STORM DEVELOPS. THE MAT-SU REGION WILL HAVE A SIMILAR PATTERN TO THE ANCHORAGE BOWL WITH A TRANSITION FROM SNOW TO RAIN FROM SOUTH TO NORTH OVERNIGHT SATURDAY NIGHT INTO SUNDAY MORNING. FOR AREAS AROUND PRINCE WILLIAM SOUND THE PRECIPITATION WILL ALSO BEGIN AS SNOW WITH HEAVY SNOWFALL OCCURRING IN THE MOUNTAINS. AS THIS STORM PUSHES IN WARM AIR AREAS AT SEA LEVEL WILL BEGIN TO SWITCH TO RAIN AND THEN RAIN WILL MAKE IT INTO VALDEZ AND THE COPPER RIVER BASIN BY SUNDAY. THERE IS THE POSSIBILITY OF A PROLONGED RAIN EVENT IN THE PRINCE WILLIAM SOUND AREA EARLY NEXT WEEK WITH THIS SYSTEM. HOWEVER IT IS TOO EARLY TO BE CERTAIN WHETHER THE FRONT WILL LINGER OVER THE NORTH GULF COAST REGION OR PUSH EASTWARD MUCH FASTER. AS SNOW TURNS OVER TO RAIN THERE WILL LIKELY BE SIGNIFICANT WATER OVERFLOW ON AREA RIVERS AND STREAMS. THIS COULD LEAD TO PONDING AND MINOR FLOODING OF LOW LYING AREAS THROUGHOUT SOUTH CENTRAL ALASKA. $$

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