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March 24-25 Potential Bomb Part Deux


earthlight

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Im still thinking the gfs is correct and that we will be hard pressed to see healthy accums as those areas with snow hover around 36f....fwiw srefs backed off big time

 

 

Are U talking about the SREFS BEFORE the latest Nam ? Cause yeah they were bad cause this afternoons Nam was bad(following suit) but than came back strong tonight like the SREF's probably will later tonight..

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euro shifted NW...not enough for a big hit but the LP is noticeably stronger and further NW. Precip is still only around 0.25-0.35 for NYC

Low is 984mb and tucked in.

And agood ccb develops and barely misses NYC.

This is a much better run. 1 more shift tomorrow and we're good to go.

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Lost in all this seeing how much each model spits out precip wise what are the Temp differences in each model and will most of the precip be Snow ? As of now Central NJ I believe will see at least 4+ inches on grassy surfaces if you blend all the models..Obviously could go up if the storm looks look more like NAM or NavGem.

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NWS-Upton just put out their snowfall map, indicating a general 2-3" event for NYC metro, LI and the southern Hudson Valley (1-2" for the northern Hudson Valley and CT), although they weren't confident enough to issue WWAdvisories, as per the discussion, noting, as several posters here have noted, that the key to the forecast is how the interaction of the Canadian Maritimes low with the developing coastal low is handled.  So, we're looking at a decent snowfall, with a more major snowfall still possible, which, at the end of the day, isn't too bad for late March. 

 

StormTotalSnowFcst.png

 

.LONG TERM /MONDAY NIGHT THROUGH SATURDAY/...
MAIN FORECAST CONCERN CONTINUES TO BE COASTAL STORM FOR
MONDAY/MONDAY NIGHT. MODEL PREDICTABILITY ISSUES CONTINUE FOR THIS
TIME PERIOD...SPECIFICALLY WITH THE ROLE OF THE SUBTROPICAL JET IN
STRENGTHENING A MID/UPPER LEVEL LOW APPROACHING THE EAST COAST
FROM THE TENNESSEE RIVER VALLEY...AND THE EXACT INTERACTION OF
THIS ENERGY WITH WITH A LARGE CLOSED LOW OVER THE CANADIAN
MARITIMES. UP UNTIL MONDAY MORNING...MODELS ARE IN DECENT
AGREEMENT WITH A SOUTHERN LOW AND TENNESSEE VALLEY LOW CONVERGING
TO THE MID ATLANTIC COAST. IT IS FROM THAT POINT ON THAT THE EXACT
NATURE OF THE ABOVE MENTIONED EVOLUTION WILL DETERMINE EXACT TRACK
AND INTENSITY OF COASTAL LOW PRESSURE AS IT INTENSIFIES AND TRACKS
ENE FROM THE MID ATLANTIC COAST MONDAY MORNING TO SE OF THE 40/70
LAT/LON MONDAY EVENING.

ALTHOUGH MODELS DIFFERENCES ARE NOT IMMENSE...SUBTLE DIFFERENCE IN
TRACK AND INTENSITY WILL HAVE BIG CONSEQUENCES. THE NAM/SREF REMAIN
A FARTHER NORTH AND SLIGHTLY SLOWER SOLUTION...WITH DECENT
CLUSTERING BETWEEN THE ECMWF/UKMET/GFS/CAN AND RESPECTIVE ENSEMBLES
MEANS WITH A FURTHER S AND QUICKER SOLUTIONS. BASED ON MODEL
PERFORMANCE THIS SEASON...GREATER CONSENSUS...AND MORE CONSISTENCY
HAVE CONTINUED TO LEAN WITH THE LATTER GROUP.

THE FARTHER NORTH SOLUTIONS WOULD RESULT IN A SIGNIFICANT SNOW EVENT
FOR MOST OF THE REGION MON INTO MON EVE...WHILE THE SOUTHERN
SOLUTION WOULD RESULT IN A FEW INCHES OF SNOW...HIGHEST AMOUNTS FOR
THE COAST. BASED ON THE MODEL PREDICTABILITY ISSUES MENTIONED ABOVE
AND A BIT OF SUPPORT FOR THE NAM/SREF FROM THE GEFS MEMBERS...CAN
NOT RULE OUT THE SREF/NAM SOLUTIONS. BUT OVERALL CONFIDENCE IN
SEEING SEVERAL INCHES OF SNOW IS TOO LOW (LESS THAN 50%) FOR ANY
WINTER WEATHER WATCHES AT THIS TIME. WINDS LOOKS TO BE SUB
ADVISORY LEVELS (GREATER THAN 30 MPH SUSTAINED AND/OR 45 MPH
GUSTS) AT THIS TIME. SEE TIDES AND COASTAL FLOODING SECTION FOR
MORE DETAILS ON THE THREAT FOR MAINLY MINOR COASTAL FLOODING.
 

http://forecast.weather.gov/product.php?site=NWS&issuedby=OKX&product=AFD&format=CI&version=1&glossary=1&highlight=off
 

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It will be interesting to watch for thundersnow in the heavier bands tomorrow working north through

Central New Jersey. We would need a more northerly tick in 12z guidance today to get the heavier 

bands to push as far north as the NAM has.

 

 

KJFK 39 03/25 15Z   35     33      55      22    0.14  0.01    538    535   -6.1 -21.5  996 100 TSSN

 




			
		
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