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November 2012 Observations and Discussions


Snow_Miser

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How does that usually work out? just wondering, happy T-Day!!!

It's more of my opinion on the pattern in place for that storm than the model war right now between the gfs/euro. I dont like it. The blocking is there but its moving out as the storm moves from west to east...allowing heights to build in the east.

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GFS and reality? Sure. So you are saying that you believe the GFS over the Euro? I would take that bet any day. The chances that the GFS will win this are under 10%. The Euro was also the only model bringing Sandy onshore in this range. The GFS had her going out into the middle of the Atlantic ocean. The Euro will undoubtedly prove to be king again with this storm. The Euro does not need support from any other model.

Because its reality and has loads of model support outside of the euro

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GFS and reality? Sure. So you are saying that you believe the GFS over the Euro? I would take that bet any day. The chances that the GFS will win this are under 10%. The Euro was also the only model bringing Sandy onshore in this range. The GFS had her going out into the middle of the Atlantic ocean. The Euro will undoubtedly prove to be king again with this storm. The Euro does not need support from any other model.

We all know the euro is good dude. How did your last call for a noreaster work out?

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I am 2 out of 3 on the last 3 from two weeks out. You win some and you lose some. I am certainly not the only one who called for that one. I also called it off before NJ. com, accuweather, and many of the other local weather people. When you try to call them from two weeks out you will tend to get some wrong from time to time.

We all know the euro is good dude. How did your last call for a noreaster work out?

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I am 2 out of 3 on the last 3 from two weeks out. You win some and you lose some. I am certainly not the only one who called for that one. I also called it off before NJ. com, accuweather, and many of the other local weather people. When you try to call them from two weeks out you will tend to get some wrong from time to time.

Maybe you will be 3 - 4 eight days from now, or maybe you will drop to .500.. I normally don't make calls but i really don't like this one (for NYC metro)

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GFS is still not budging.

I don't know about that run...at 288 hours it has the 0 C @ 850 mb isotherm along the north shore of Hudson Bay...around December 5...that's just not gonna happen.

GFS may have a Tennessee Valley to Buffalo track...but in reality...how any times does that actually happen?.. Not that often, compared to the offshore track.

Time will tell.

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Interestingly my parents Davis has been running below freezing most of the night (30.6 right now) while TTN, less than 2 miles away and 84 feet higher, has been staying above (currently reading 36).

This airmass has been kind to radiational cooling areas. The temp spread between my backyard and NYC is 15F right now. KNYC: 48F, and here: 32.6F. Tonight has already fallen sub forecast again - we weren't expected to reach freezing.

Last night was 28.6F. Woke up to hvy frost this morning. It's been a remarkable November in terms of # of sub freezing nights - tonight will make #11, and we've still got a week of November left. My lowest temp was 23.8F on November 6th.

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Despite the chilly November, no freezing or sub-freezing temperatures have been recorded at LaGuardia this autumn; the low for the month is 33 F on the 7th.

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PRELIMINARY EXTENDED FORECAST DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER COLLEGE PARK MD

305 AM EST FRI NOV 23 2012

VALID 12Z TUE NOV 27 2012 - 12Z FRI NOV 30 2012

GENERAL FLOW PATTERN

====================

A REPETITION OF THE PATTERN SEEN OVER THE PAST FEW WEEKS IS

EXPECTED, WITH AN AMPLIFIED TROUGH MOVING INTO THE EASTERN

PACIFIC, WITH DOWNSTREAM RIDGING FORMING ACROSS THE WEST AND

PLAINS, AND RENEWED TROUGHING ANTICIPATED ACROSS THE NORTHEAST,

THOUGH THE RIDGE/TROUGH COUPLET OVER THE LOWER 48 IS EXPECTED TO

BE COMPOSED OF BROAD FEATURES OF RELATIVELY LOW AMPLITUDE, WHICH

LEADS TO QUICK SHORTWAVE MOVEMENT THROUGH THE COUNTRY.

MODEL PREFERENCE

================

MODEL ISSUES ARE SIGNIFICANT THIS PERIOD. THE 00Z ECMWF BECOMES

VERY FAST WITH A SHORTWAVE MOVING THROUGH THE PLAINS MONDAY, AND

EVEN THOUGH ITS PATTERN ALOFT RESEMBLES THE ENSEMBLE MEAN SOLUTION

LATE NEXT WEEK, ITS PRESSURE PATTERN HAS BEEN SO CONTAMINATED BY

THIS QUICK-MOVING SHORTWAVE ACROSS THE EAST AND WESTERN ATLANTIC,

ITS SOLUTION COULD NOT BE USED. THE 00Z GFS BROKE DOWN THE

WESTERN RIDGE WEDNESDAY MORNING BY USING A FORMERLY CLOSED LOW TO

DO SO, AND DOES NOT CONVERGE WITH THE REMAINDER OF THE GUIDANCE

UNTIL DECEMBER 1ST, SO ITS SOLUTION WAS NOT USED EITHER. THE 00Z

CANADIAN SHARPENS THE BASE OF THE SHORTWAVE MOVING THROUGH THE

PLAINS EARLY ON, AND SENDS A DEEP CYCLONE ACROSS THE CENTRAL

APPALACHIANS INTO THE MID-ATLANTIC STATES WHICH SHOWS LITTLE

RESPECT TO THE COOL AIR IN ADVANCE OF THE FEATURE (NO OBVIOUS COLD

AIR DAMMING). THE CANADIAN SOLUTION IS ON THE SLOW SIDE OF THE

12Z GLOBAL ENSEMBLE ENVELOPE TO BOOT, AND CONSIDERING THE

RELATIVELY LOW AMPLITUDE FLOW, ITS SOLUTION SHOULD BE QUICKER AND

POSSIBLY WEAKER HERE, SO ITS SOLUTION WAS NOT BE USED EITHER.

PER THE ABOVE, THE PRESSURES USED A 00Z UKMET TEMPLATE THROUGH

TUESDAY BEFORE TRANSITIONING TO A 50/50 BLEND OF THE 00Z GEFS/12Z

ECMWF ENSEMBLE MEAN SOLUTIONS. THE 00Z UKMET SOLUTION WAS NOT

PERFECT EITHER, SHOWING QUICKER PROGRESSION THAN ANTICIPATED BY

THE ENSEMBLE LOW CLUSTERING ACROSS THE EAST AND WESTERN ATLANTIC,

SO SHIFTED ITS LOW PRESSURE CENTER TOWARDS 12Z GLOBAL ENSEMBLE

CLUSTERING TUESDAY AND WEDNESDAY. CONSIDERING THE DETERMINISTIC

MODEL SPREAD THIS PERIOD, THE RELATIVELY LOW AMPLITUDE FLOW ACROSS

THE LOWER 48 UNITED STATES, AND THE LACK OF AN OVERALL GOOD

DETERMINISTIC MODEL CHOICE, CONFIDENCE IS BELOW AVERAGE IN THIS

PREFERENCE.

ROTH

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