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Models Advertising Late Month Storm And Cold Front


bluewave

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Euro has plenty of precip between 6z and 12z sunday. It should be snowing, especially with no day time heating. The storm is bombing so fast, plenty of cold should be sucked in.

Well, the good news is its still 5 days away. It’s going to be fun seeing which way this trends! 50 miles east or west makes a HUGE difference!

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Well, the good news is its still 5 days away. It’s going to be fun seeing which way this trends! 50 miles east or west makes a HUGE difference!

Yeah, given the time of day this storm would be coming through, if this was 50 miles to the east, everyone would see snow and NW jersey hudson valley Danbury CT on North would see nice accumulation. Probably still too warm in the city but it would be their best shot.

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Yeah, given the time of day this storm would be coming through, if this was 50 miles to the east, everyone would see snow and NW jersey hudson valley Danbury CT on North would see nice accumulation. Probably still too warm in the city but it would be their best shot.

Do we go below freezing after the storm pulls away?

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The foreign models blowing up a storm make me pretty optimistic about its chances. GFS is far too often late to the party in these setups. The big contrast that would exist between 60s water temps and 30s over land could blow up a big storm. The Poconos/Catskills and even NW NJ can certainly have accums-the higher you go this time of year, even 500 feet, can make a major difference. Down near NYC would be much harder and would need huge dynamics to overcome urban heating and warm air near the shore. I would expect possibly a brief burst of snow or flurries at the end as opposed to a sustained snow event. Like others have said, too bad this isn't December.

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Do we go below freezing after the storm pulls away?

The last part of the storm is in the upper 30's for all of us, while 850's are well below freezing.

.75" of precip falls during this timeframe.

After the storm pulls away, euro indeed does show temps below 32, even in the city for Sunday night into Monday morning.

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The last part of the storm is in the upper 30's for all of us, while 850's are well below freezing.

.75" of precip falls during this timeframe.

After the storm pulls away, euro indeed does show temps below 32, even in the city for Sunday night into Monday morning.

And thicknesses are below 540 by a good emount. Flakes will be in the air!

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A lot of people think it's already December with the upcoming storm and its definitely not. The best we can hope for is a few wet snowflakes really, it's not like we are going to get accumulating snows people, not near the coast or in the city. Perhaps in the higher elevations of PA, NW NJ, maybe, not here. It'll definitely feel like winter is around the corner if we get this noreaster type system but 40s and rain is yuck at the same time.

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It looks like Upton isn't quite ready to use the 'S' word just yet. Even in there far N&W zone of Western Passaic

.SATURDAY...PARTLY SUNNY IN THE MORNING...THEN MOSTLY CLOUDY WITH A CHANCE OF RAIN SHOWERS IN THE AFTERNOON. HIGHS IN THE MID 40S. CHANCE OF RAIN 30 PERCENT.

.SATURDAY NIGHT...MOSTLY CLOUDY WITH A CHANCE OF RAIN SHOWERS IN THE EVENING...THEN PARTLY CLOUDY AFTER MIDNIGHT. LOWS IN THE LOWER 30S. CHANCE OF RAIN 30 PERCENT.

A lot of people think it's already December with the upcoming storm and its definitely not. The best we can hope for is a few wet snowflakes really, it's not like we are going to get accumulating snows people, not near the coast or in the city. Perhaps in the higher elevations of PA, NW NJ, maybe, not here. It'll definitely feel like winter is around the corner if we get this noreaster type system but 40s and rain is yuck at the same time.

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It looks like Upton isn't quite ready to use the 'S' word just yet. Even in there far N&W zone of Western Passaic

.SATURDAY...PARTLY SUNNY IN THE MORNING...THEN MOSTLY CLOUDY WITH A CHANCE OF RAIN SHOWERS IN THE AFTERNOON. HIGHS IN THE MID 40S. CHANCE OF RAIN 30 PERCENT.

.SATURDAY NIGHT...MOSTLY CLOUDY WITH A CHANCE OF RAIN SHOWERS IN THE EVENING...THEN PARTLY CLOUDY AFTER MIDNIGHT. LOWS IN THE LOWER 30S. CHANCE OF RAIN 30 PERCENT.

Of course not, its forever away and early in the season, but they were noting last night the storm was going to come west.

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EXTENDED FORECAST DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD

330 PM EDT MON OCT 24 2011

VALID 12Z THU OCT 27 2011 - 12Z MON OCT 31 2011

DURING THE MEDIUM RANGE PERIOD EXPECT A MODERATELY PROGRESSIVE

PATTERN WHICH OVER A MULTI-DAY TIME FRAME SHOULD AVERAGE OUT TO

BROAD CYCLONIC FLOW WITH AN AXIS OVER THE ERN HALF OF THE CONUS.

CONFIDENCE IN GUIDANCE EVOLUTION OF EACH INDIVIDUAL SHRTWV IS

AVERAGE TO BELOW AVERAGE DUE TO THE SENSITIVITY TO ACCURATE TIMING

OF UPSTREAM AND DOWNSTREAM FEATURES. INDIVIDUAL SYSTEMS ARE

DESCRIBED BELOW FROM EAST TO WEST.

SOLNS STILL DISPLAY A MODERATE AMOUNT OF SPREAD WITH THE WAVE FCST

TO TRACK OFF THE EAST COAST AROUND LATE DAY 3 THU. THE 00Z

ECMWF/ECMWF MEAN PROVIDE THE BEST INTERMEDIATE TRACK BETWEEN THE

FARTHEST LEFT 00Z GEFS MEAN AND MORE SUPPRESSED 00Z

UKMET/CANADIAN. THE 00Z/06Z GFS RUNS ARE NOT TOO FAR FROM THE

ECMWF TRACK BUT ARE A LITTLE FASTER. IN 12Z GUIDANCE THE CMC IS

STILL SUPPRESSED WHILE THE UKMET IS SLOW. THE GFS/GEFS MEAN ARE A

BIT ON THE FAST SIDE OF THE SPREAD BUT AT LEAST THE SWD ADJUSTMENT

OF THE GEFS MEAN AS WELL AS THE ECMWF TO SOME DEGREE NARROWS THE

NRN SIDE OF THE ENVELOPE.

UPSTREAM THERE IS A DECENT MAJORITY OPERATIONAL CLUSTER SUGGESTING

THAT MORE SHRTWV ENERGY WILL BE OVER THE SRN ROCKIES AND VICINITY

AT THE START OF THU THAN FCST BY LATEST GFS RUNS. SOME GEFS

MEMBERS ALSO FAVOR THE ECMWF CLUSTER THOUGH NOT IN SUFFICIENT

NUMBERS TO BE WELL REFLECTED IN THE CORRESPONDING MEAN. 12Z SOLNS

APPEAR TO BE GRAVITATING TOWARD A COMPROMISE BETWEEN THE 00Z

GFS/ECMWF EXTREMES. THIS ENERGY IS EXPECTED TO BE SHEARED NEWD

AHEAD OF AMPLIFYING WRN CANADA/NRN ROCKIES FLOW BY SAT TO YIELD AN

ERN CONUS TROF WHOSE PRECISE SHARPNESS WILL DETERMINE THE TRACK OF

ASSOC SFC LOW PRESSURE THAT MAY AFFECT SOME AREAS OVER THE EAST.

THE 00Z/06Z GFS AND 00Z ECMWF/UKMET ALL INDICATE A MORE DEVELOPED

WRN ATLC SYSTEM THAN SHOWN IN LATEST ENSEMBLE MEANS WITH ONLY THE

00Z CANADIAN MORE SUPPRESSED. THE STRONGEST AND MOST WWD

ECMWF/UKMET ARE WITHIN THE ENSEMBLE SPREAD... BUT OCCASIONAL

TENDENCY TOWARD OVER-DEVELOPMENT IN THE UKMET AND LACK OF

CONTINUITY IN THE ECMWF AND OTHER MODELS CURRENTLY FAVOR A

COMPROMISE APPROACH AMONG THE 00Z ECMWF/00Z GFS/06Z GFS PERHAPS

LEANING A LITTLE MORE TOWARD THE ECMWF TRACK BY EARLY SUN ONCE THE

SYSTEM REACHES JUST S OF THE CANADIAN MARITIMES. THE 12Z UKMET IS

PERSISTENT WITH STG COASTAL DEVELOPMENT AND THE 12Z ECMWF HAS

ADJUSTED A LITTLE WWD OF ITS 00Z RUN. THE 12Z CMC HAS COMPLETELY

REVERSED FROM ITS 00Z RUN AND NOW SHOWS THE FARTHEST WWD TRACK

DURING THE WEEKEND. ONLY THREE 12Z GEFS MEMBERS SUGGEST AN

ECMWF/UKMET TYPE EVOLUTION BUT OPERATIONAL TRENDS FAVOR A STRONGER

TREND TO THE 00Z ECMWF FOR NOW WHILE AWAITING BETTER CLUSTERING

AND ESTABLISHMENT OF CONTINUITY BEFORE ADJUSTING FARTHER WWD TO

THE 12Z ECMWF.

THE FIRST SYSTEM EXPECTED TO REACH THE WEST COAST DURING THE

PERIOD SHOULD ARRIVE AROUND FRI. THE 06Z GFS COMPARES LESS

FAVORABLY TO OTHER SOLNS AS IT DISPLAYS A SHARPER/MORE AMPLIFIED

FEATURE ON FRI... THOUGH EXTREME TRAITS DIMINISH THEREAFTER. THE

12Z GFS APPEARS MORE REASONABLE AT LEAST INTO SAT. AS THIS SHRTWV

MOVES INLAND DURING THE WEEKEND INTO EARLY NEXT WEEK SOME

TIMING/DETAIL SPREAD DEVELOPS WITH 00Z-12Z GFS RUNS LEANING TO THE

PROGRESSIVE SIDE OF THE SPREAD AND THE 00Z ECMWF MEAN TO THE SLOW

AND SWWD ELONGATED SIDE. THE 00Z ECMWF IS BETWEEN THE TWO.

NEGATIVE HGT ANOMALIES THAT MULTI-DAY MEANS INDICATE TO VARYING

DEGREES OVER THE NRN ATLC BY D+8 TELECONNECT TO A POSITIVELY

TITLED MEAN TROF OVER THE CNTRL CONUS... FAVORING SOME INCLUSION

OF THE ECMWF MEAN ALONG WITH THE INTERMEDIATE OPERATIONAL ECMWF.

HOWEVER NEG HGT ANOMALIES TO THE N OF ALASKA OFFER POTENTIAL FOR A

SOMEWHAT FLATTER/FASTER SOLN. THE FINAL SYSTEM OF THE PERIOD

SHOULD REACH WRN CANADA AND THE PAC NW AROUND SUN-MON WITH THE 00Z

AND 12Z GFS THE NOTABLE EXTREMES FOR AMPLITUDE OF THIS TROF. THE

ARRAY OF 12Z GUIDANCE OFFERS LITTLE COMPELLING REASON TO ALTER

PRIOR THINKING FOR THESE SYSTEMS.

BASED ON THE ABOVE CONSIDERATIONS THE UPDATED PRELIM FCST STARTED

WITH A BLEND OF MOSTLY 00Z ECMWF/ECMWF MEAN AND 20 PCT OF THE LESS

PROBABLE GEFS MEAN FOR THE DAYS 3-7 THU-MON FCST TO ACCOUNT FOR

FCST UNCERTAINTY. DUE TO STG/WRN NATURE OF 12Z OPERATIONAL SOLNS

WITH THE SFC LOW NEAR THE EAST COAST DURING THE WEEKEND... FINAL

ISSUANCE ADJUSTS MORE STRONGLY TO NEAR THE 00Z ECMWF WHILE

AWAITING CONFIRMATION OF AN EVEN MORE WRN TRACK. MINOR

ADJUSTMENTS WERE ALSO MADE EARLY IN THE FCST FOR THE LEADING WAVE

DEPARTING FROM THE EAST COAST. NO CHANGES WERE NEEDED FOR OTHER

FEATURES.

EXPECT FAIRLY WARM AND DRY CONDS TO PREVAIL OVER THE SRN TWO

THIRDS OF THE WEST WITH ONE OR MORE PERIODS OF GENERALLY LGT-MDT

PCPN AND NEAR NORMAL TEMPS FROM THE PAC NW INTO NRN ROCKIES.

MEANWHILE MUCH OF THE ERN HALF OF THE CONUS SHOULD SEE BELOW

NORMAL TEMPS DURING THE PERIOD WITH SOME LOCATIONS SEEING ONE OR

MORE DAYS WITH HIGHS 10 DEG F OR GREATER BELOW AVERAGE. INITIAL

WAVE/FRONTAL SYSTEM WILL BE ASSOC WITH ONE AREA OF PCPN FROM THE

MID ATLC SWWD EARLY IN THE PERIOD. MORE PCPN MAY MOVE OVER THE

EAST BY THE WEEKEND DEPENDING ON EVOLUTION OF LOW PRESSURE NEAR

THE EAST COAST. WITH BOTH SYSTEMS THE POTENTIAL EXISTS FOR SNOW

OVER FAVORED TERRAIN OF THE NORTHEAST. MEANWHILE A COUPLE AREAS

OF LGT PCPN MAY EXTEND FROM THE NRN PLAINS INTO THE GRTLKS/OH VLY

DURING THE PERIOD.

RAUSCH

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Not that they are believable, and credit to AG3 on this, but wunderground euro snow maps are 4-5 inches n and w of city and 2-3 even down over western LI. They are 3 hour increments.

I would buy it if it wasn't october 30, but I don't like how warm the surface is, it has to be all dynamically driven, very tough to do at the coast. Not impossible, but very tough.

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