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12z Models 2/11/2014 | Potential Major Coastal Storm


earthlight

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For the coast the NAM and  SREF  are still there . The  UKMET GGEM EURO , break us into 2  Thump - Rain - CCB 

 

I would like to grab one of those models back tonite  by 0z tonite without losing the NAM 

And Lastly the GFS , in which I  dont know where it really stands so can`t use it . 

 

Just away from the coast  - you`re golden . 

 

Would lean towards the Non American models , but I can still see how KNYC can get to 12 here as the 850`s collapse towards the center   .

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Coming off OBX and to the mouth of the Delaware , i just don`t see the confluence to jump this east . 

I think its on the coast and was hoping to see the Euro come 25 - 50  mile east , it didn`t , kissed the coast 

 

Yeah ,this run closes off with 2 contours over NC so the initial motion is more northerly pulled back by the UL

instead of slipping more NNE to NE.

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http://goes.gsfc.nasa.gov/

 

how does this look for a start?

 

latest_zps289ac8bf.jpg

 

 

 

latest from the OPC

thru the BM track

 

A_48hrbw_zps3f79a52d.gif

looks like the beginning of something people many from Georgia to Maine will be talking about for some time... not saying it will be a winner for everyone's backyard (few are) but that corridor stands to see a very impressive storm and we're lucky enough we may be in it..

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For the coast the NAM and SREF are still there . The UKMET GGEM EURO , break us into 2 Thump - Rain - CCB

I would like to grab one of those models back tonite by 0z tonite without losing the NAM

And Lastly the GFS , in which I dont know where it really stands so can`t use it .

Just away from the coast - you`re golden .

Would lean towards the Non American models , but I can still see how KNYC can get to 12 here as the 850`s collapse towards the center .

How far away from coast? I am about 20 to 25 away? Thanks

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Curious to see how Upton digests all of this mornings and afternoons model info.  I think they will have to follow mt.holly and even binghamton and and issue watches at 4PM.  Want to see what they do with Long Island and the battle ground area. Watches for Suffolk or just HWO based on confidence of reaching 6 inch plus there. Think they will also bump up accumulation maps significantly for the interior and leave it similar to how it is now for the coast/LI

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000
FXUS61 KOKX 112049
AFDOKX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW YORK NY
349 PM EST TUE FEB 11 2014

.SYNOPSIS...
A LARGE AREA OF HIGH PRESSURE WILL MOVE ACROSS THE TRI-STATE AREA
THROUGH WEDNESDAY. LOW PRESSURE THEN DEVELOPS ALONG THE
SOUTHEAST COAST WEDNESDAY NIGHT AND PASSES JUST TO OUR SOUTH AND
EAST THURSDAY. A COUPLE OF WEAK LOW PRESSURE CENTERS MOVE ACROSS
THE AREA THIS WEEKEND.

&&

.NEAR TERM /THROUGH WEDNESDAY/...
THE CALM BEFORE THE STORM. WEAK RIDGING ALOFT AND SURFACE HIGH
PRESSURE WILL SLIDE ACROSS THE REGION THROUGH WEDNESDAY AFTERNOON.
THIS WILL PROVIDE MAINLY CLEAR SKIES...LIGHT WINDS AND CHILLY
TEMPERATURES OVER THE NEXT 24 HOURS.

&&

.SHORT TERM /WEDNESDAY NIGHT THROUGH THURSDAY NIGHT/...
LOW CONFIDENCE FORECAST AS COMPLEX STORM SYSTEM WILL IMPACT THE
REGION DURING THIS TIME. WINTER STORM WATCHES HAVE BEEN ISSUED FOR
THE ENTIRE CWA...AND THIS CAN BE CONVERTED TO WARNINGS/ADVISORIES
AS NECESSARY AS THE EVENT DRAWS CLOSER AND CONFIDENCE IN THE
FORECAST INCREASES.

HIGH PRES OVER THE WESTERN ATLANTIC CONTINUES TO DEPART WEDNESDAY
EVENING AS LOW PRES OFF THE SOUTHEAST U.S. COAST TRACKS NORTH INTO
THE MID-ATLANTIC STATES. OVERRUNNING PRECIP DEVELOPS AHEAD OF THE
LOW JUST AFTER MIDNIGHT WEDNESDAY NIGHT OVER SOUTHEAST PORTIONS OF
THE CWA...AND THEN SNOW OVERSPREADS THE REGION DURING THE THURSDAY
MORNING COMMUTE.

THERE CONTINUES TO BE SOME DIFFERENCES AMONG THE MODELS IN TERMS
OF WHERE THE LOW WILL TRACK DURING THE DAY THURSDAY...WITH MODELS
STILL ALL OVER THE PLACE. 12Z ECMWF HAS A WARMER...WETTER
SOLUTION. 12Z NAM IS COLDER...BUT HAS COME IN WITH MORE
PRECIP...WHICH WOULD MEAN MORE SNOW. 12Z GFS SEEMS TO BE IN THE
MIDDLE...AND IS FAIRLY ALIGNED WITH THE 00Z GFS ENSEMBLE MEAN. 12Z
CMC ALSO FAVORS THE 12Z ECMWF...BUT IS NOT AS FAR WEST. AS A
RESULT...STILL DO NOT HAVE A GOOD FEEL AS TO HOW THIS STORM WILL
PLAY OUT...BUT SOME OF THE DETAILS ARE COMING INTO PLACE.

SHOULD THE ECMWF VERIFY...WE MAY BE TALKING FLOODING CONCERNS WITH
WARMER TEMPS AND LIQUID QPF AMOUNTS 3/4 TO 1 1/2 INCHES. IF THE
NAM VERIFIES...WE COULD BE TALKING HEAVIER SNOW AMOUNTS DOWN INTO
COASTAL ZONES...POSSIBLY GREATER THAN 8 INCHES. IT ALL DEPENDS ON
THE TRACK OF THE LOW AND WHERE THE RAIN/SNOW LINE SETS UP ON
THURSDAY.

FOR NOW...LOOKING AT A BURST OF MODERATE TO HEAVY SNOW THURSDAY
MORNING WITH A GOOD 4-6 INCHES OF ACCUMULATION THROUGHOUT...AND
LESSER AMOUNTS ACROSS NW ZONES. SNOW MIXES WITH AND CHANGES TO
RAIN ALONG THE COAST...BUT EXACTLY WHERE IS UNCERTAIN...AND THEN
PRECIP CHANGES BACK TO SNOW THURSDAY NIGHT AS LOW PRES DEPARTS AND
UPPER LOW MOVES ACROSS THE REGION. SINCE PRECIP IS EXPECTED TO
REMAIN AS SNOW ACROSS THE INTERIOR THURSDAY AND THURSDAY
NIGHT...STORM TOTAL SNOWFALL WILL RANGE FROM 8-12 INCHES WITH
LOCALLY HIGHER AMOUNTS ACROSS THE LOWER HUDSON VALLEY AND INTERIOR
PORTIONS OF SOUTHERN CT...AND 6-8 INCHES ACROSS COASTAL
CT...NYC...LONG ISLAND...AND SOUTHERN NJ. FOR COASTAL AREAS...SNOW
WILL COME IN 2 BATCHES...A SLUG OF 4-6 INCHES THURSDAY MORNING AND
THEN A SLUG OF 2-3 INCHES THURSDAY NIGHT INTO FRIDAY MORNING.
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mt holly

 

 



.LONG TERM /WEDNESDAY NIGHT THROUGH TUESDAY/...
WINTER STORM WARNINGS ISSUED SOUTH, WATCHES EXTENDED NORTH AND
ADVISORIES FOR SOME OF THE SOUTHEASTERN COASTAL COUNTIES.

WHILE THE GFS INITIALIZATION LOOKED GOOD, THERE REMAINS A DISCONNECT
BETWEEN THE U.S. MODELS AND ALL OF THE OTHER MODELS AS FOR TRACK
AND A DIFFERENCE BETWEEN THE WRF-NMMB AND THE OTHER MODELS WITH THERMAL
FIELDS. AS FAR AS TRACK GOES THE UKMET AND CAN GGEM MOVED TOWARD
THE ECMWF WHICH HAS REMAINED PRETTY STEADY THE LAST COUPLE OF
SOUNDING RUNS. THE GFS THERMAL FIELDS IN SPITE OF THE SFC LOW
LOCATION FARTHER OFFSHORE ARE SIMILAR TO THE OTHER MODELS, BUT
MAY BE A BY PRODUCT OF LOWER INTENSITY RATES, COULD BE RIGHT FOR
THE WRONG REASON.

THE ONE DIFFERENCE BETWEEN THIS RUN AND PREVIOUS ECMWF RUNS IS A BIG
TIME DRY SLOT INTO OUR CWA. REGARDLESS ALL OF THE MODELS ARE SHOWING
A VERY STRONG ISENTROPIC/FRONTOGENETIC THUMPING AT THE FRONT END AND
THEN A CCB/DEFORMATION ZONE PHASE THAT WILL OCCUR DURING THE
AFTERNOON AND INTO THE NIGHT.

GIVEN THE UNCERTAINTIES AS TO THERMAL FIELDS WE ASK EVERYONE TO
PLEASE FOLLOW UPDATES. THERE WERE FOUR ANALOGS THAT CAME CLOSEST
TO THE CURRENT EVENT, BASICALLY A POORLY PLACED SFC HIGH, BUT AN
INTENSIFYING LOW PRESSURE SYSTEM COMING OUT OF THE GULF OF MEXICO:
MARCH 7-8 1941, JANUARY 21-23 1987, FEB 10-11, 1994 AND THE
INFAMOUS SURPRISE STORM OF JANUARY 24-25, 2000. THE 00Z GFS CIPS
ANALOGS HAVE THE AXIS OF HEAVIEST SNOW SLIGHTLY NORTHWEST OF THESE
ANALOGS. GIVEN THE WESTWARD EDGING OF THE MODELS, WE DO HAVE THE
AXIS OF HEAVIEST SNOW NOW NORTHWEST OF I95. THE GOOD NEWS OFF THE
FCST SOUNDINGS, THEY DO NOT LOOK ICY, AND MORE SLEETY, THUS WE
HAVE REMOVED THE MENTION OF FREEZING RAIN.

AS FOR THE PARTICULARS, TIMING SIMILAR ON WEDNESDAY NIGHT, SNOW
OVERSPREADING OUR CWA FROM SOUTH TO NORTH. WARMER AIR COMING IN
FROM THE OCEAN AND ALOFT SHOULD CHANGE PRECIPITATION OVER TO SLEET
AND RAIN NEAR AND ALONG THE IMMEDIATE COAST.

THEN ON THURSDAY, PTYPES FOLLOWED A ECMWF AND GFS COMPROMISE THE
CLOSEST. WHETHER EAST OR SQUARE DOWN THE GUT, IT LOOKS AS THOUGH
PCPN INTENSITY SHOULD LESSEN SOMEWHAT DURING THE MIDDAY HOURS,
ESPECIALLY CENTRAL AND EAST BECAUSE OF THE DRY SLOT. EPV STILL
GOES NEGATIVE BEFORE, THUNDERSNOW MIGHT OCCUR. BY THEN WE BELIEVE
MOST PLACES THAT DO CHANGE TO SLEET AND OR RAIN WILL HAVE WARNING
CRITERIA SNOW REACHED. PLACES FARTHER TO THE WEST, THE STRONG
DYNAMIC FORCING IS EXPECTED TO BYPASS THEM AND THEY WILL BE
WAITING FOR THE CCB PCPN AT A STEADIER SNOW RATE. MARGINAL SFC
TEMPS WILL BE COMPENSATED BY CROSS HAIR OMEGA AND SNOW GROWTH ON
THU MORNING SO WE KEPT RATIOS CLOSE TO 10:1. IT WILL BE A WET
SNOW, SO FURTHER POWER OUTAGES ARE POSSIBLE. OUR HIGH WIND/WIND
ADVY CHECK LIST IS NOT GETTING US TO HEADLINE LEVELS NEAR THE
COAST. WE BASED THIS OFF THE ECMWF.

DEFORMATION BAND SNOWS SEEM TO SNOW THEMSELVES OUT FOR LACK OF A
BETTER TERM THAN MOVE AND THIS APPEARS TO BE THE SCENARIO ON
THURSDAY NIGHT. WITH COLDER AIR WRAPPING BACK INTO THE FCST AREA,
A CHANGE OF RAIN BACK TO SNOW SHOULD SPREAD CLOSER TO THE COAST
BEFORE PCPN ENDS OVERNIGHT.
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