Artic Blast No 2 Mid-Week
Posted by JAC on 12/13/2009, 4:19 pm
  SHORT RANGE FORECAST DISCUSSION NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD 240 PM EST SUN DEC 13 2009 VALID 00Z MON DEC 14 2009 - 12Z TUE DEC 15 2009 ENTERING NEXT WEEK...MUCH OF THE CENTER OF THE NATION CAN EXPECT VERY COLD TEMPERATURES AS ANOTHER ARCTIC AIR MASS DROPS SOUTHWARD THROUGH THE PLAINS. WHILE THE INITIAL PROGRESS OF THE BOUNDARY WILL BE SLOW AT THE START...IT SHOULD PICK UP SOME STEAM BY MONDAY MORNING AS IT SURGES SOUTHWARD REACHING THE WESTERN GULF COAST BY THE FOLLOWING MORNING. IN THE WAKE OF THIS POWERFUL SYSTEM...A STRONG SURFACE ANTICYCLONE WILL BUILD OVER THE CENTRAL U.S. WHICH WILL PROMOTE WELL BELOW NORMAL TEMPERATURES ACROSS MUCH OF THE MIDDLE OF THE NATION. FOR INSTANCE...HIGHS ON MONDAY ARE EXPECTED TO BE CONSTRAINED TO THE NEGATIVE SINGLE DIGITS ACROSS PORTIONS OF THE NORTHERN PLAINS WITH NOT MUCH IMPROVEMENT ACROSS THE CENTRAL PLAINS AS HIGHS SHOULD NOT RISE ABOVE THE TEENS. MOREOVER...SUBZERO OVERNIGHT LOWS WILL BE COMMONPLACE ACROSS MUCH OF THE NORTHERN TIER STRETCHING AS FAR SOUTH AS THE NEBRASKA/KANSAS BORDER. EVENTUALLY THE FRIGID AIR MASS WILL MOVE EASTWARD INVADING THE UPPER GREAT LAKES BY LATE TUESDAY. WHILE THE COLD WILL BE A MAJOR STORY ENTERING THE MIDDLE OF DECEMBER...PRECIPITATION WILL ALSO BE A NOTEWORTHY FEATURE...AFFECTING MANY LOCATIONS OF THE NATION. BEGINNING WITH THE NORTHEASTERN U.S...A SYSTEM ORIGINATING FROM THE GULF OF MEXICO HAS MOVED NORTHWARD ALONG THE LEE OF THE APPALACHIANS UP INTO THE MID-ATLANTIC REGION. WIDESPREAD PRECIPITATION HAS ACCOMPANIED THIS WEATHER SYSTEM...MOSTLY IN THE FORM OF LIGHT TO MODERATE RAIN SHOWERS. HOWEVER...ON THE NORTHERN FRINGE OF THE SWATH OF PRECIPITATION...A MIXTURE OF SNOW AND FREEZING RAIN HAS BEEN HITTING AREAS OF THE UPPER MID-ATLANTIC AND INTO THE INTERIOR NORTHEAST. THIS SYSTEM IS FORECAST TO PUSH OFFSHORE BY EARLY MONDAY MORNING. ON IT WINGS...A WEAK UPPER DISTURBANCE WILL BRING A LIGHT BATCH OF PRECIPITATION...THROUGH THE MIDWEST AND INTO THE GREAT LAKES ON TUESDAY. AMOUNTS SHOULD REMAIN ON THE LOWER END GIVEN MEAGER MOISTURE AVAILABILITY. A SYSTEM WHICH HAS PUSHED THROUGH MUCH OF THE WESTERN U.S. IS CURRENTLY BRINGING WIDESPREAD SNOWFALL TO THE INTERIOR MOUNTAIN WEST. THE HEAVIEST SNOWS ARE EXPECTED ACROSS THE WASATCH AND TETONS WHERE THE STRONGEST OROGRAPHIC FORCING WILL EXIST. A BULK OF THE PRECIPITATION SHOULD WIND DOWN BY MONDAY EVENING BEFORE ANOTHER DISTURBANCE PUSHES ONSHORE. AT THIS POINT...YET ANOTHER ROUND OF COASTAL/VALLEY RAIN AND INTERIOR SNOWS ARE IN THE FORECAST ENTERING MONDAY NIGHT. LOOKING ELSEWHERE...A WEAK BOUNDARY HOVERING ALONG THE GULF COAST WILL KEEP CONDITIONS UNSETTLED ACROSS THE DEEP SOUTH WITH SHOWERS AND THUNDERSTORMS EXPECTED BY MIDDAY MONDAY AND AFFECTING THE REGION THROUGH TUESDAY. RUBIN-OSTER |
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- Extreme cold in Prairies; snowstorms in B.C. - JAC, 12/15/2009, 5:41 am
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