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NYC CWA January 26-27 OBS and Discussion Thread


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Mother...of...God

I can't believe we went from a possible rainstorm to another KU storm

I am sorry, this is not going to be like that, KU storms are only used when we get a 1 to 2 foot snowfall.

This will be very nice storm but no KU.

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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"

I like your numbers. They are very close to NWS numbers. As I like to say, a nice 5-9 inch snowfall. Nothing more. Nothing less. Pretty good snowfall most winters, but mundane for this winter. I guess living in Buffalo I have become quite used to weekly 4-8 inch snowfalls.

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yea i really dont care what the qpf map shows... cuz this is A++++

gfs_700_024m.gif

True, that is quite nice. GFS cut back slightly on QPF, but still a substantial hit for the area. LI gets slammed, maybe this will calm ace down lol? :snowman:

Cut off is extremely sharp back towards northwest NJ but if the past is any indication, just on the northwest edge of the 0.75-1.00" line is where you wanna be.

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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.

I don't have any problem with this in general. My problem was with identifying feedback errors off the Atlantic and determining whether or not that impacted the SLP track and eventual solution. I maintain that it is very difficult to identify causal factors in valid vs. invalid solutions.

I certainly trust HPC over general meteorologists, which I alluded to. That said, it is not clear that the convection actually caused the surface position error (I happen to believe it here). This almost always happens with southern stream lows. And it also does not single out the NAM.

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True, that is quite nice. GFS cut back slightly on QPF, but still a substantial hit for the area. LI gets slammed, maybe this will calm ace down lol? :snowman:

Cut off is extremely sharp back towards northwest NJ but if the past is any indication, just on the northwest edge of the 0.75-1.00" line is where you wanna be.

The GFS seems wetter south and east and has a sharper cutoff to the northwest.

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I guess I worded it wrong. Meant to say that a good portion of the qpf in those areas will not be accumulating snow

The majority of the precip. falls when the column has cooled enough for snow. When you see the soundings you'll be able to see better that Monmouth county and northeast Burlington county really get hit hard with epic CCB.

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