Tuesday, January 29, 2013

High winds possible Wednesday. Caution!

Upton:

SOUTHERLY WINDS WILL GRADUALLY INCREASE WED INTO WED EVENING...
THEN POTENTIAL FOR DAMAGING WINDS WILL EVOLVE MAINLY LATE WED
NIGHT AS A VERY STRONG LOW LEVEL JET OF /90-100 KT AT 900 MB/
DEVELOPS ALONG THE MID ATLANTIC COASTAL PLAIN AND NEARBY WATERS
AND SWINGS NE ACROSS THE AREA FROM NYC METRO ON EAST. WHILE FCST
SOUNDINGS SHOW A DEEP SFC-BASED INVERSION WHICH WOULD NORMALLY
INHIBIT DOWNWARD MOMENTUM TRANSFER...MODEL DATA STILL SUGGESTS
DAMAGING WIND POTENTIAL ON SEVERAL POINTS...INCLUDING A STRONG
ENOUGH LLJ PER LOCAL RULE OF THUMB...DOWNWARD MOMENTUM TRANSFER
VIA PRECIP DRAG IN HEAVIER SHOWERS AHEAD OF/ALONG THE FRONT...AND
POTENTIAL FOR DUCTED GRAVITY WAVE DEVELOPMENT AS A MID LEVEL JET
STREAK RIDING UP THE MID ATLC COAST PASSES THE INFLECTION POINT OF
THE UPSTREAM TROUGH/DOWNSTREAM RIDGE...AND AS MODEL SOUNDINGS SHOW
STABLE LOW LEVELS TOPPED BY MARGINAL INSTABILITY ALOFT.

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