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Potential major phasing event this weekend


forkyfork

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If we saw the Euro solution verify, then I think that it would be the first time a TC phased

with a trough while under the exit region of the STJ. The Euro jet forecast more resembles

the jet signature with our strongest cold season lows. Adding a TC to this mix would take

things to a level of rarity that would be remarkable.

Just the fact that this is a possibility is mind blowing. Really lends credence to the idea floating around that the model ouputs (GGEM/EC) are just about the upper limit of what can occur on this planet. Crazy stuff

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MODEL DIAGNOSTIC DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER COLLEGE PARK MD

1131 AM EDT TUE OCT 23 2012

...TRPCL CYCLONE SANDY...

T.S. SANDY WHICH IS CURRENTLY A 45 KT SYSTEM IN THE CNTRL

CARIBBEAN WITH A MOTION TOWARD THE NNE. THE CURRENT NHC FCST

SUGGESTS SANDY WILL PASS THRU JAMAICA AS A CAT 1 HURCN ON WED

EVENING WITH SLGT WEAKENING THEREAFTER ONCE PUSHING INTO THE ERN

CUBA. IN TERMS OF THE FCST TRACK...THE MODELS MOST SIMILAR TO THE

NHC TRACK ARE THE 06Z GFS/GEFS MEAN ALONG WITH THE 00Z ECMWF/ECMWF

ENS MEAN. MORE SPECIFICALLY...THE FORMER LIES JUST TO THE W OF THE

TRACK WHILE THE LATTER RESIDES JUST TO THE E. THUS...A GENERAL

BLEND OF THESE TWO MODELS BEST SUITS THE CURRENT HURRICANE TRACK.

...UPR LOW DEVELOPING ALONG THE ALBERTA/SASKATCHEWAN BORDER...

MID-LEVEL VORTICITY PUSHING NEWRD ALONG THE ERN EXTENT OF THE WRN

CONUS TROF SHOULD CONTINUE TO ATTAIN NEGATIVE TILT BEFORE CLOSING

OFF ALONG THE ALBERTA/SASKATCHEWAN BORDER. THIS SYSTEM IS EXPECTED

TO THEN SHIFT NEWRD WITH STRENGTHENING ALOFT ACRS CNTRL CANADA.

THE 12Z/06Z NAM HAS SLOWED IN EWRD PROGRESSION COMPARED TO THE 00Z

RUN ALONG THE SASKATCHEWAN/MANITOBA BORDER...ESPECIALLY BY EARLY

THU. GENERAL AGREEMENT ALOFT EXISTS ACRS THE BOARD WITH ALL

GUIDANCE DEPICTING A 534-DM LOW CENTER BY 26/0000Z ALTHOUGH

COMPLEXITIES EXIST AS THIS ENERGY GAINS LATITUDE TOWARD HUDSON BAY.

...LNGWV TROF TRANSLATING EWRD THRU THE CNTRL CONUS...

...DEVELOPING SFC LOW/ASSOCIATED FRONTAL ZONE...

A WELL ESTABLISHED LNGWV TROF WILL SHIFT TOWARD THE E DURING THE

FCST PERIOD WITH THE LEADING EDGE OF THE HGT FALLS EVENTUALLY

INTENSIFYING OVER THE MID MS VALLEY BY EARLY/MID THU. GIVEN THE

SHARP AMPLITUDE OF THIS EJECTING TROF...A STRONG COLD FRONT WILL

TRANSLATE EWRD WHILE A DEEP SFC LOW DEVELOPS OVER THE WRN GRT

LAKES. IT APPEARS MUCH OF THE NAM INCONSISTENCIES ARE WITH THE

TRAILING PIECE OF ENERGY CROSSING THE CNTRL ROCKIES LATER IN THE

WEEK. CURRENTLY THERE ARE TWO CAMPS OF SOLNS WITH THE TIMING OF

THIS LNGWV TROF. THE FASTER SIDE INCLUDES THE 06Z GFS/GEFS MEAN

AND 00Z UKMET WHILE THE SLOWER SIDE INCLUDES THE 12Z NAM/00Z

ECMWF/00Z ECMWF ENS MEAN/03Z SREF MEAN.

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ORECAST COMPLEXITIES ARISE LATE IN THE PERIOD...SPECIFICALLY WITH

THE HANDLING OF TROPICAL CYCLONE SANDY DURING DAYS 6-7. REFER TO THE

LATEST NHC TRACK AND INTENSITY FORECASTS FOR SPECIFIC DETAILS ON THE

STORM.

GLOBAL MODELS FEATURE A TRANSIENT OMEGA BLOCK...THAT TRANSLATES

ACROSS THE EASTERN U.S. AND INTO THE WESTERN ATLANTIC BY EARLY NEXT

WEEK. THE ASSOC UPPER LOW FROM THE TROPICAL CYCLONE GETS STEERED

ALONG BY THIS FEATURES...WITH THE 00Z ECMWF AND GGEM FARTHEST WEST

WITH A FUJIWARA EFFECT...WHILE THE OPERATIONAL GFS KEEPS THE SYSTEM

WELL OFF THE EAST COAST. AS FOR THE GEFS...7 OF THE 21 MEMBERS ARE

NOW HINTING AT SOME SORT OF INTERACTIONS WITH THE MID LATITUDE TROF

ACROSS EASTERN NORTH AMERICA AND SOME RETROGRESSION OF THE LOW

TOWARD THE EASTERN SEABOARD.

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1039 AM EDT TUE OCT 23 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL

WATERS...SOUTHERN CONNECTICUT...NORTHEAST NEW JERSEY AND SOUTHEAST

NEW YORK.

.DAY ONE...TODAY AND TONIGHT.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THERE IS A LOW PROBABILITY OF SIGNIFICANT RAINFALL AND STRONG

WINDS SOMETIME EARLY NEXT WEEK. THIS WILL DEPEND ON THE TRACK OF

TROPICAL CYCLONE SANDY THAT IS STILL SOUTH OF THE CARIBBEAN ISLANDS.

HOWEVER...THIS STORM MAY VERY WELL JUST MOVE OUT TO SEA AND HAVE

LITTLE IF ANY IMPACT ON OUR WEATHER.

AGAIN...FORECAST CONFIDENCE IS LOW AS ANY POTENTIAL IMPACT IS

STILL AROUND A WEEK AWAY...SO STAY TUNED TO LATER FORECASTS

THROUGHOUT THE WEEK.

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