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2/9-2/10 Inverted Trough/Mini-Coastal Storm


Zelocita Weather

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GFS finally has the small coastal. Gives the area between .25-.50 QPF.

It finally discovered what some of the higher resolution models had been showing for some time. Whether the ECMWF will be next remains to be seen.

 

Some QPF amounts:

 

BDR: 0.30"

BLM: 0.24"

DXR: 0.22"

GON: 0.15"

HVN: 0.25"

EWR: 0.32"

FOK: 0.44"

HPN: 0.30"

ISP: 0.42"

JFK: 0.34"

LGA: 0.32"

MMU: 0.37"

NYC: 0.30"

POU: 0.14"

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It finally discovered what some of the higher resolution models had been showing for some time. Whether the ECMWF will be next remains to be seen.

 

Some QPF amounts:

 

BDR: 0.30"

BLM: 0.24"

DXR: 0.22"

GON: 0.15"

HVN: 0.25"

EWR: 0.32"

FOK: 0.44"

HPN: 0.30"

ISP: 0.42"

JFK: 0.34"

LGA: 0.32"

MMU: 0.37"

NYC: 0.30"

POU: 0.14"

 

What are we thinking in terms of ratios?  Will the development of a coastal kick up the winds enough to cut them down?

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Man, those heavier totals are so so close. Really though, setups like this are unpredictable so we won't know what gonna happen until the event is unfolding.

Inverted trough setups like these always are. I'd rather be in one of the areas forecasted to get little 48 hours out from it than under the jackpot given how much these change. 

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Inverted trough setups like these always are. I'd rather be in one of the areas forecasted to get little 48 hours out from it than under the jackpot given how much these change. 

 

It`s not a typical  IVT .

 

SLP  develops E of A/C and tracks to the BM .Its not a skinny 10 mile wide  kink in passing LP  with bending  isobars back to the coast . 

 

It`s not a Norlun crap shoot . This is surface LP that`s really acting  independent  from the main center in the Atlantic  .

 

Now whether this is where the actual baroclinic zone sets up  ( ALL the guidance but the EURO agree  ) is another story . 

 

 

rgem_mslp_pcpn_frzn_us_8.png

 

 

rgem_mslp_pcpn_frzn_us_12.png

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Now how much precip falls will be the question .

 

The RGEM/UKIE have not waivered here , and I would follow those 2 . 

S/CNJ could likely be the JP but you will have to see how far N this comes 

 

"THESE INVERTED TROUGHS OFTEN OUT-PERFORM MODEL GUIDANCE AND
SOMETIMES ALSO END UP NORTH OF MODEL FCST"

 

 

 

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM WEDNESDAY/...
AS A DEEP LONGWAVE TROUGH MOVES TOWARD THE NORTHEAST...THE
ASSOCIATED MID LEVEL CLOSED LOW WILL OPEN UP...WITH A STRONG MID
LEVEL VORT MAX ROUNDING THE BASE OF THE TROUGH AND SWING ACROSS
WED MORNING. MEANWHILE AT THE SURFACE...THE INVERTED TROUGH IN THE
WAKE OF THE FIRST LOW WILL CONTINUE TO LIFT SLOWLY NORTH CLOSER
TO THE AREA...WITH A WEAK LOW CENTER ALSO DEVELOPING OFFSHORE IN
RESPONSE TO THE APPROACHING SHORTWAVE. THESE WILL BOTH HELP TO
FOCUS BANDS OF LIGHT TO MODERATE SNOW MAINLY OVER NYC METRO...LONG
ISLAND AND COASTAL SECTIONS TONIGHT
INTO WED MORNING. SIDED MOSTLY
WITH A BLEND OF THE 00Z NAM/GFS...WITH THE NAM MOSTLY HAVING HELD
COURSE OVER THE PAST 24 HR AND THE GFS TRENDING NORTH TOWARD A
SIMILAR FCST SOLUTION. FCST SOUNDINGS SHOW BEST LIFT AT TEMPS
IDEAL FOR DENDRITIC SNOW GROWTH...AND ALSO SHOW VERY WEAK STATIC
STABILITY...WITH A DEEP SATURATED LAYER AND MOIST ADIABATIC LAPSE
RATES. SNOWFALL RATES SHOULD BE ENHANCED AS A RESULT LATE TONIGHT
INTO WED MORNING...AND WOULD NOT RULE OUT A RUMBLE OF THUNDER
DURING PERIODS OF HEAVIER SNOW. AS A RESULT
...ISSUED A WINTER WX
ADVY FOR NYC METRO...LONG ISLAND AND COASTAL CT FOR TONIGHT INTO
WED MORNING.

THESE INVERTED TROUGHS OFTEN OUT-PERFORM MODEL GUIDANCE AND
SOMETIMES ALSO END UP NORTH OF MODEL FCST...SO THE SITUATION
TONIGHT WILL HAVE TO BE WATCHED CLOSELY. HAD EVEN BRIEFLY
CONSIDERED A WINTER STORM WATCH FOR NYC METRO AND LONG ISLAND
BECAUSE OF THIS...BUT WITH SREF STAYING TO THE SOUTH AND CAM
GUIDANCE NOT PRODUCING APPRECIABLE QPF CONSIDERING THE CONVECTIVE
ASPECT...DECIDED ON THE ADVY AS THE BEST COURSE OF ACTION.

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