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NYC CWA January 26-27 OBS and Discussion Thread


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EDUGGS.....this is for YOU!!

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE MOUNT HOLLY NJ

901 PM EST TUE JAN 25 2011

.NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...

BASED ON THE 00Z SOUNDINGS AND SURFACE OBSERVATIONS, PCPN ITSELF IS

LAGGING THE FASTER MODEL SOLUTIONS, LEANING TOWARD A ECMWF AND

WRF-NMM COMPROMISE VERIFYING THE BEST AS OF 00Z. THE 18Z GFS .01

ISOHYET WAS ABOUT 75 MILES TOO FAR TO THE NORTH, ITS 0.10 ISOHYET

WAS VERIFYING BETTER FOR THE START OF THE MEASURABLE.

WE ALSO SUSPECTED THE GULF COAST CONVECTION WOULD CAUSE SOME

MODELING PROBLEMS AND THE SFC LOW VERIFIED MUCH FARTHER NORTH (IN

ALABAMA) THAN MOST OF THE MODELS HAD, CAN GGEM AND ECMWF

VERIFYING THE BEST THERE.

AS FOR THE 500MB PATTERN, THE TROF IS NOT AS SHARP AS MODELED,

ESPECIALLY ON THE EASTERN FLANK WHERE HEIGHTS ARE 10-20M LOWER.

THE RIDGING THEN TOWARD US WAS PRETTY CLOSE. THE POSITIONING OF

THE CLOSED LOW WAS SPOT ON.

THE 850MB AND 925MB TEMP 12HR FORECASTS ARE VERIFYING ABOUT HALF A

DEGREE TO DEGREE CELSIUS TOO LOW, WITH THE NAM HAVING THE LION`S

SHARE OF THE COLD ERRORS. ECMWF WAS CLOSEST.

IN THE SHORTER TERM, GIVEN THE LAG, WE SLOWED THE ARRIVAL OF PCPN

DOWN FOR THE OVERNIGHT. THE LATEST GFS FORECAST SOUNDINGS SUGGEST

MORE OF A SNOW OR SLEET TO RAIN PTYPE AT THE ONSET OF THE

PRECIPITATION IN THE SOUTHEASTERN PART OF OUR CWA WITH LESS OF A

FREEZING RAIN THREAT. TEMPS HAVE DROPPED WITH THE THINNER CLOUDS

THIS EVENING AND WE`LL HAVE TO SEE IF THEY RESPOND BACK UPWARD

ONCE THE CLOUDS THICKEN.

AS FOR THE REST OF THE FORECAST THE WEAKER TROF MAY BE ABLE TO

COMPENSATE FOR THE NORTHERN DISPLACEMENT OF THE LOW AS THE TURN WE

WOULD INFER WOULD BE MORE GRADUAL. THE THERMAL FIELD VERIFYING

SLIGHTLY WARMER WILL GIVE US PAUSE TO SEE IF THE 00Z MODEL SUITE

CHANGES MUCH IN MAKING THE FINAL ADVISORY/WARNING DECISION.

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Always will be with areas of strong omega and lift and subsidence on the outside of those bands.

Where do you think the banding will set up this storm, John?

Many of the models seem to be targeting LI and the Central Jersey Shore with lighter totals to the NW, but will this undergo the typical closer-to-the-coast trend that we've seen with other storms?

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00Z RGEM Total Snow

for all the KU naysayers...if the snow map of the RGEM becomes reality it would be a low end. If the 3 storm sin Jan/Feb 1987 are KU's this would be.

It encompasses DCA, IAD, BWI, PHL, TTN, NYC, PVD, BOS all with over 1"QPF, some of them over 1.50". If its all snow that would be a widespread 10-20" snowfall.

Again, im NOT SAYING THIS IS GOING TO HAPPEN.

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GFS out to 18 hours looks like it may want to cut back on QPF from 18z. The h5 low is weaker and heights are slightly lower on the east coast. Also, the CCB band looks less organized and the placement of the low pressure system is dramatically further to the northeast.

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Here is my first and only call for this storm :

Philadelphia, pa : 5-8" mix to snow my guess : 7"

Monmouth, nj : 5-8" mix to snow my guess : 5.2"

Newark, nj : 5-8" possible mix to snow my guess : 6.4"

New York, ny : 5-8" possible mix to snow my guess : 5.9"

Atlantic city, nj : 2-4" rain to mix/snow my guess : 3.4"

West Milford, nj : 7-10" snow my guess : 8.3"

White plains,ny: 6-8" snow my guess : 6.1"

Boston, ma : 6-9" snow my guess : 7.4"

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