4th Big Storm of Winter 2009 -2010

INVERTED TROUGH WILL DRIVE NOR'EASTER SOUTHEAST TO NORTHWEST VERY NEAR NYC

INGREDIENTS COMING TOGETHER FOR A POWER HOUSE NOR’EASTER WITH PARALYZING BLIZZARD CONDITIONS

  • A powerful Nor’easter will explode (‘bomb out’ or rapidly deepen) off the Mid-Atlantic coastline and track very close to New York City Thursday.
  • An upper level low will close off and the jet stream will become inverted (southeast to northwest orientation) as a massive ‘blocking’ ridge of high pressure sits over the Canadian Maritime.
  • These synoptic patterns will allow this system to wobble and stall out as it rapidly deepens and tracks northwest instead of northeast (due to the inverted trough axis – or ‘negatively tilted trough).
NORTH AMERICAN MODEL DEPICTS A NOR'EASTER (WINTER'S HURRICANE) SITTING OFF OF NYC
  • The image above is the  NAM (North American Model) forecast for Friday morning… depicting heavy snow and white out conditions from Baltimore’s northeastern suburbs to the Philadelphia Area …Poconos… Catskills…Finger Lakes…Hudson Valley and Adirondacks.
  • Sleet, rain and snow (nasty mix) would be pounding New England as strong southeast winds bring mild air into the mid layers of the atmosphere (thanks to the inverted/negatively tilted trough set up).
WHERE I THINK PARALYZING ACCUMULATIONS WILL OCCUR, GENERAL SNOWFALL AND A MIX (I realize I misspelled Binghamton, NY on my map above - my apologies)

MID-ATLANTIC STATES(NORTHEAST STATES EXCLUDING NEW ENGLAND)

  • Washington and Baltimore Areas:  **Heavy Snow now possible Thursday  into Friday with white out conditions and accumulations (highest north and east of D.C.) Wind gusts over 50 mph are possible with power outages making travel very difficult.

  • Philadelphia :  Very heavy snow with blizzard conditions likely.

  • New York City: A mix of snow and rain (due to proximity to the low pressure track)… heavy at times with white out conditions.

  • Northern NJ- The Poconos – Central New York: Easily 2 Feet of snow could fall across these areas with 60 mph wind gusts – blowing and drifting snow (paralyzing storm).

NEW ENGLAND STATES – (NORTHEAST STATES EXCLUDING THE MID-ATLANTIC- WE DON’T HAVE ‘TOWN HALLS’ IN PHILLY, NYC, BALTIMORE OR WASHINGTON)

  • From Hartford & Boston to Portland to Bar Harbor – With a Jet Stream screaming out of the SOUTHEAST – a nose of warm maritime air at the mid-levels will produce very heavy rain, sleet and wet snow, cutting down on accumulation potentials along the 95 corridor.

  • Go west of the Connecticut River Valley and that’s where the heaviest accumulations will be.

One Reply to “4th Big Storm of Winter 2009 -2010”

  1. DISTRICT OF COLUMBIA-MONTGOMERY-PRINCE GEORGES-CHARLES-ST. MARYS-
    LOUDOUN-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-
    ARLINGTON/FALLS CHURCH/ALEXANDRIA-
    INCLUDING THE CITIES OF…WASHINGTON…GAITHERSBURG…WALDORF…
    ST MARYS CITY…LEESBURG…MANASSAS…MANASSAS PARK…FAIRFAX…
    ALEXANDRIA…FALLS CHURCH
    558 PM EST TUE FEB 23 2010

    …WINTER STORM WATCH IN EFFECT FROM LATE WEDNESDAY NIGHT THROUGH
    LATE THURSDAY NIGHT…

    THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A
    WINTER STORM WATCH…WHICH IS IN EFFECT FROM LATE WEDNESDAY NIGHT
    THROUGH LATE THURSDAY NIGHT.

    * PRECIPITATION TYPE…SNOW.

    * ACCUMULATIONS…POTENTIAL FOR SNOW ACCUMULATIONS OF 5 OR MORE
    INCHES.

    * TIMING…A MIX OF RAIN AND SNOW WEDNESDAY EVENING WILL BECOME
    ALL SNOW BETWEEN MIDNIGHT AND 3 AM WEDNESDAY NIGHT. SNOW IS
    EXPECTED TO CONTINUE THURSDAY AND THURSDAY NIGHT.

    * TEMPERATURES…LOWS IN THE UPPER 20S WEDNESDAY NIGHT. HIGHS IN
    THE LOWER TO MID 30S THURSDAY. LOWS IN THE UPPER 20S THURSDAY
    NIGHT.

    * WINDS…NORTHWEST WINDS 10 TO 15 MPH WEDNESDAY NIGHT.
    NORTHWEST WINDS 15 TO 25 MPH WITH GUSTS AROUND 35 MPH THURSDAY
    AND THURSDAY NIGHT.

    Like

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