Re: Here we go
Posted by JAC on 1/21/2011, 8:20 am
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAUNTON MA
431 AM EST FRI JAN 21 2011

*POTENTIAL MAJOR WINTER STORM NEXT WED/THU

MAIN FOCUS FOR THIS TIME PERIOD NOW SHIFTS TO POTENTIAL MAJOR STORM
AROUND MID WEEK. THE ECMWF HAS TRENDED SLOWER WITH ITS 00Z RUN AND
IS NOW ONLY ABOUT 6 HOURS FASTER THAN THE OPERATIONAL GFS. THE GGEM
IS STILL WAY SLOWER BECAUSE IT DIGS THE SOUTHERN STREAM ENERGY INTO
THE GULF OF CALIFORNIA BEFORE LIFTING IT TOWARD THE GULF OF MEXICO.
AS PER THE PREEPD...THAT SOLUTION DOES NOT SEEM TO BE AS LIKELY
GIVEN THE PATTERN THIS WINTER SO FAR. ALTHOUGH THERE WILL BE MANY
DETAILS TO WORK OUT FOR AN EVENT THAT IS STILL AT LEAST 5 OR 6 DAYS
AWAY...MEDIUM RANGE MODELS HAVE BEEN SIGNALING A POTENTIAL
SIGNIFICANT COASTAL STORM ALREADY FOR SEVERAL DAYS. MANY OF THE
DETAILS WILL AGAIN INVOLVE THE TIMING OF PHASING BETWEEN NORTHERN
AND SOUTHERN STREAMS. THERE SEEMS TO BE GOOD EVIDENCE THAT A FAIRLY
POWERFUL STORM MAY EVOLVE FROM JUST THE SOUTHERN STREAM WITH COPIOUS
GULF AND SUBTROPICAL ATLC MOISTURE. THE ECMWF THERMAL PROFILE HAS
GOTTEN SOMEWHAT COLDER WITH SUCCESSIVE RUNS AND IS COLDER THAN THE
OPERATIONAL 00Z GFS. INCLINED TO THINK THE COLDER PROFILE MAY MAKE
SENSE GIVEN THE DEPTH AND EXTENT OF ARCTIC AIR RESIDENT OVER NEW
ENGLAND. NONETHELESS...WESTWARD EXTENT OF THE TRACK WILL BE A
DETERMINING FACTOR. FOR NOW...GOING WITH PTYEP OF SNOW ESSENTIAL
ALONG AND NW OF THE BOS-PVD CORRIDOR AND RAIN OR SNOW TO THE SE.
HAVE KEPT POPS IN CHANCE RANGE DUE TO HOW FAR OUT IN TIME...BUT
INCREASED A LITTLE AND ADJUSTED TO ACCOMMODATE THE PROBABLE SLOWER
TIMING FROM PRIOR RUNS. THIS HAS THE POTENTIAL TO BE A VERY HIGH
IMPACT EVENT WITH HEAVY SNOW AND HIGH WINDS. ASTRO TIDES HAVE COME
DOWN SINCE PAST THE FULL MOON BUT STILL MIGHT HAVE TO DEAL WITH SOME
COASTAL FLOODING AND SIGNIFICANT BEACH EROSION...IF EITHER THE
00Z ECMWF OR 00Z GFS SOLUTION COMES CLOSE TO VERIFYING.

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Heads up Fred - JAC, 1/20/2011, 1:12 pm
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