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Possible 2/16 storm threat


UlsterCountySnowZ

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early morning call from My Holly NWS

 

 

CLOUDS WILL THICKEN AND LOWER ON SUNDAY NIGHT WITH SOME LIGHT
SNOW ARRIVING FROM THE SOUTHWEST TOWARD DAYBREAK ON MONDAY. THE
SNOW IS FORECAST TO OVERSPREAD NORTHEASTERN MARYLAND, DELAWARE,
MUCH OF EASTERN PENNSYLVANIA AND MUCH OF NEW JERSEY DURING THE
MORNING HOURS. A DEVELOPING SOUTHEAST TO SOUTH WIND SHOULD CAUSE
TEMPERATURES TO RISE. THE SNOW IS EXPECTED TO CHANGE TO RAIN ALONG
THE COAST AND INLAND AS FAR AS THE INTERSTATE 95 CORRIDOR DURING
THE COURSE OF THE AFTERNOON AND EARLY EVENING. SNOWFALL AMOUNTS ON
THE COASTAL PLAIN ARE EXPECTED TO BE RATHER LIGHT, GENERALLY AN
INCH OR LESS.

A STRENGTHENING LOW LEVEL JET IS FORECAST TO BECOME LOCATED OVER
OUR REGION ON MONDAY NIGHT BRINGING WARM AIR AND MOISTURE INTO OUR
REGION. THE SNOW IS FORECAST TO CHANGE TO RAIN BY TUESDAY MORNING
IN THE REMAINDER OF OUR COUNTIES IN EASTERN PENNSYLVANIA AND
NORTHERN NEW JERSEY BUT NOT BEFORE THE SNOW ACCUMULATES TO ABOUT 2
TO 4 INCHES. THERE COULD BE A TRANSITION THROUGH FREEZING RAIN IN
OUR NORTHERN COUNTIES LATE ON MONDAY NIGHT.

THE RAIN IS EXPECTED TO BECOME HEAVY AT TIMES. LIQUID
PRECIPITATION TOTALS OF 1.25 TO 2.00 INCHES MAY BE COMMON FROM THE
INTERSTATE 95 CORRIDOR NORTHWESTWARD. TOTALS MAY RANGE FROM 0.75
TO 1.50 INCHES ON THE COASTAL PLAIN BASED ON THE LATEST FORECAST
GUIDANCE. WE CONTINUE TO BE A BIT CONCERNED ABOUT THE POTENTIAL
FOR SOME FLOODING, ESPECIALLY ALONG SMALL STREAMS AND IN AREAS OF
POOR DRAINAGE.
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Exactly... Who posted the DGEX from before? Lmao... Imagine if that POS scored a coup and everyone got a big storm, would be hilarious

That was me.

On a side note, the crappy CRAS has probably been the most consistent of any model irt to this threat. Still shows a weaker less amped system which is more like a fropa (remember that HP rushing in from the Midwest I posted a map of on the 18z nam?) then stalls the front along or just off the coast with a weak wave or 2 of slp riding along it. All precip mostly frozen DC-NYC. Correct verbatim? Probably not but I know this model's biases rather well and overamplifying and wrapping up slp is one of them. When it doesn't show a low folllwing it's bias in this type of situation it raises a red flag for me and suggests that perhaps these weaker, more strung out scenarios (18z nam, 0z cmc) may in fact hold some merit.

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That was me.

On a side note, the crappy CRAS has probably been the most consistent of any model irt to this threat. Still shows a weaker less amped system which is more like a fropa (remember that HP rushing in from the Midwest I posted a map of on the 18z nam?) then stalls the front along or just off the coast with a weak wave or 2 of slp riding along it. All precip mostly frozen DC-NYC. Correct verbatim? Probably not but I know this model's biases rather well and overamplifying and wrapping up slp is one of them. When it doesn't show a low folllwing it's bias in this type of situation it raises a red flag for me and suggests that perhaps these weaker, more strung out scenarios (18z nam, 0z cmc) may in fact hold some merit.

Yea it was a good OBS

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FWIW, SREF doesnt even have a low. Looks like a weak wave riding the front. I think the more flat this is, the better the chance of frozen precip especially at the start will be.

Doesn't matter how flat or amped the system is for snow when precip starts either way it starts as snow everywhere - their is nothing to keep the cold enough air locked in for an extended period - in fact the flatter weaker scenario might lead to less precip at the start thus less snow - regardless it will change to all rain the closer to the coast you are - maybe in the immediate metro we can squeeze an inch or 2 of snow out of this if we are lucky IMO.

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Doesn't matter how flat or amped the system is for snow when precip starts either way it starts as snow everywhere - their is nothing to keep the cold enough air locked in for an extended period - in fact the flatter weaker scenario might lead to less precip at the start thus less snow - regardless it will change to all rain the closer to the coast you are - maybe in the immediate metro we can squeeze an inch or 2 of snow out of this if we are lucky IMO.

Well more east and flatter will be more colder air. I will be fine with 1-2 inches of snow.

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As per their overnight model diagnostic discussion, WPC is preferring a faster, less amplified solution and going with a blend of 12z/00z GFS.

got a link ? did they mention the follow up LP right behind the first one ? The first wave might drag down cold enough air so that the second one is frozen or partially frozen with the right track...

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got a link ? did they mention the follow up LP right behind the first one ? The first wave might drag down cold enough air so that the second one is frozen or partially frozen with the right track...

 

http://www.wpc.ncep.noaa.gov/discussions/hpcdiscussions.php?disc=pmdhmd

 

..DEVELOPING SRN STREAM STORM SYSTEM OVER THE SOUTHERN PLAINS/LWR

MS VALLEY INTO THE MID ATLC SUN INTO TUE MRNG...

PREFERENCE:12Z/00Z GFS BLEND

FORECAST CONFIDENCE: AVERAGE

THE MAIN TREND IN THE NAM AND GFS OVER THE PAST SEVERAL RUNS IS TO

SHOW LESS AMPLIFICATION WITH LEAD S/WV THAT IS FCST TO SHARPEN

SEWD THRU THE CNTL OR SRN PLAINS AS THESE MODELS SHOW A STGR

TRAILING S/WV DIGGING SEWD TOWARD THE MID MS VALLEY AS OPPOSED TO

THE UPR MS VALLEY BY TUES MRNG. THE END RESULT IS A MUCH FASTER

AND LESS AMPLIFIED EJECTION OF LEAD S/WV TOWARD THE MID ATLC

REGION TUES MRNG COMPARED TO THE SLOWER AND MORE AMPLIFIED 12Z

EC/UKMET SOLNS. WHILE THE 18Z GFS WAS EVEN QUICKER..ITS SOLN WAS

FASTER THAN THE 18Z GEFS ENSEMBLE. WHILE THERE STILL SEEM TO BE

TWO CAMPS OF SOLNS WITH THE 12Z EC AND 12Z UKMET OFFERING THE MORE

AMPLIFIED AND SLOWER SOLNS..WITH THE TREND OF THE MODELS SLOWING

MORE DIGGING OF S/WV ENERGY THRU THE MID MS VALLEY BY TUES

MRNG...THIS WOULD SUGGEST A QUICKER EJECTION OF LEAD S/WV. A

PRELIMINARY PREFERENCE WOULD BE TO AVERAGE OUT THE 12Z AND 00Z GFS

SOLNS WHICH WOULD BE SOMEWHAT FASTER AND FLATTER SOLN TO THE 12Z

EC/12Z UKMET. UPDATED LOOK AT BOTH THE 00Z UKMET AND 00Z EC...BOTH

HAVE TRENDED FASTER AND LESS AMPLIFIED...AND MORE IN THE DIRECTION

OF OUR PRELIMINARY PREFERENCE WHICH WAS A BLEND OF THE 12Z AND 00Z

GFS. 

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