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Pattern/storm inverted trough thread early Jan


Damage In Tolland

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Turtle sounds bullish...

FRIDAY-SATURDAY...THIS MORNING/S MODEL SUITE CONTINUES TO SHOW THE

MOVEMENT OF THE UPPER LEVEL VORTEX ACROSS NY STATE...POSSIBLY MOVING

OFFSHORE JUST AS A POTENTIALLY STRONG COASTAL OR OFFSHORE LOW

PRESSURE CENTER MAY TAKE SHAPE. MOST MODELS SIGNALING A STRONG STORM

DEVELOPING FRIDAY NIGHT...PASSING WELL SE OF NANTUCKET SATURDAY.

HOWEVER...THIS LOW MAY ACTUALLY SLOW DOWN...IF THE UPPER LEVEL

VORTEX CAPTURES IT. 00Z ECMWF HAS COME A BIT MORE IN LINE WITH THE

GFS AND GEFS MEAN...THOUGH THE GFS CONTINUES TO BE A SOMEWHAT STRONG

OUTLIER.

ONE THEME THAT CONTINUES THIS MORNING IS THAT THERE IS A GOOD

LIKELIHOOD OF PRECIPITATION ACROSS MOST OF THE REGION. THE QUESTION

IS HOW MUCH QPF WILL FALL...WHICH IS ALL IMPORTANT AS IT APPEARS

THAT THE MAJORITY OF ANY PRECIP WILL BE SNOW THOUGH THERE MAY BE

SOME MIXTURE OR CHANGE TO RAIN ALONG THE COAST. HAVE CARRIED LIKELY

POPS FOR MOST AREAS...EXCEPT ALONG SECTIONS OF THE S COAST /FOR NOW/

ON FRIDAY...SHIFTING TO THE E COAST BY SATURDAY. DID NOT CARRY QUITE

AS MUCH QPF AS PREVIOUS FORECAST...BUT THIS ALONG WITH MANY OTHER

DETAILS ARE HIGHLY UNCERTAIN AT THIS TIME.

THIS POTENTIAL SYSTEM WILL CONTINUED TO BE MONITORED CAREFULLY...AS

WE HAVE SEVERAL MORE MODEL RUNS TO EXAMINE PRIOR TO FRIDAY. THE LAST

SEVERAL EVENTS THIS WINTER HAVE SHOWN US THAT...IF THIS LOW BECOMES

MORE AMPLIFIED...THE SYSTEM/S TRACK COULD SHIFT CLOSER TO THE COAST.

WILL CONTINUE TO MONITOR MODEL TRENDS FOR MORE CONSENSUS. STAY TUNED

FOR FURTHER UPDATES.

The 00z Euro and 06z GFS look really close to closing off just S of us. The problem I see right now is that lead piece of energy pushing the best baroclinic zone offshore a bit. It was the same piece of energy I was keying in on last night that was screwing me up with my analysis. If that piece can trend weaker, I think we can see this ULL close off S of here. If you roll the 06z GFS from like 66h to 108h you can see what I am talking about.

http://www.meteo.psu...6z/avnloop.html

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The 00z Euro and 06z GFS look really close to closing off just S of us. The problem I see right now is that lead piece of energy pushing the best baroclinic zone offshore a bit. It was the same piece of energy I was keying in on last night that was screwing me up with my analysis. If that piece can trend weaker, I think we can see this ULL close off S of here. If you roll the 06z GFS from like 66h to 108h you can see what I am talking about.

http://www.meteo.psu...6z/avnloop.html

Weaker or stay east, Its screwing things up, We had talked about this the other day as we need that to be out of play completly to not effect the piece being ejected out of the northern stream........

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Weaker or stay east, Its screwing things up, We had talked about this the other day as we need that to be out of play completly to not effect the piece being ejected out of the northern stream........

Although I favor a storm over no storm the idea that it is coming west with any type of certainty is funny. We've only had a storm or two this whole winter so there's no real pattern set and just as many "hits" went east.

Let's hope it comes together with more certainty today.

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I'll take the NAM..lol.

Well certainly looks like something in the cards. The 00z euro ensembles look a lot better than the horrible 12z run. I think everyone has hatched out the possibilties, so no use reiterating.

I still like the pattern going forward, but once again..I'll say that all types of storms are possible from miller b's to swfe that flip the coast briefly to rain at the end. With the trough to the west, these are all possibilities. As long as it's active..that's all I care about.

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I'll take the NAM..lol.

Well certainly looks like something in the cards. The 00z euro ensembles look a lot better than the horrible 12z run. I think everyone has hatched out the possibilties, so no use reiterating.

I still like the pattern going forward, but once again..I'll say that all types of storms are possible from miller b's to swfe that flip the coast briefly to rain at the end. With the trough to the west, these are all possibilities. As long as it's active..that's all I care about.

I think the 00z ec would be welcomed for at least half of the region. That set-up is intriguing. Almost gets me on board the major event train.

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Although I favor a storm over no storm the idea that it is coming west with any type of certainty is funny. We've only had a storm or two this whole winter so there's no real pattern set and just as many "hits" went east.

Let's hope it comes together with more certainty today.

We shall see, Things should start play out some time in the next couple of days......

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And it could just as easily shift northward again. Like always, this will come down to nowcasting. There's sure to be surprises as the event unfolds.

There is one definite trend though that i see is that the mid Atlantic is probably out of the game unless we get the low to amplify and dig further south........

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And it could just as easily shift northward again. Like always, this will come down to nowcasting. There's sure to be surprises as the event unfolds.

"Nowcasting" is one of those words that doesn't actually mean anything, like "paternity test" and "liability."

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Good summary for those catching up from OKX...

.LONG TERM /FRIDAY THROUGH MONDAY/...

UPPER LEVEL LOW OVER THE GREAT LAKES FRIDAY MORNING DIGS SOUTHEAST

TOWARDS THE MID-ATLANTIC COAST AND THEN MOVES OFFSHORE SATURDAY. AT

THE SURFACE...WEAK LOW PRESSURE IS LIKELY TO BE SOMEWHERE OVER THE

NORTHEAST U.S. FRIDAY MORNING...ALTHOUGH MODELS DIFFER ON ITS EXACT

TRACK. 00Z GFS HAS THE LOW STRONGER AND LOCATED JUST NORTH OF THE

FORECAST AREA...WHILE THE 00Z ECMWF ADVERTISES A WEAKER LOW FURTHER

NORTH. MODELS AGREE ON A GENERAL SCENARIO OF THIS LOW WEAKENING

FRIDAY WHILE AN OFFSHORE LOW DEVELOPS RAPIDLY OVER THE ATLANTIC

NEAR 70W AND EAST OF THE NC/VA BORDER REGION. GFS STRENGTHENS THE

LOW MORE PROGRESSIVELY AND PUSHES IT QUICKLY EAST OF THE 40N/70W

BENCHMARK FRIDAY NIGHT/SATURDAY MORNING...THEN NORTH TO WATERS EAST

OF CAPE COD BY SATURDAY AFTERNOON. ECMWF BRINGS THE LOW CLOSER TO

THE BENCHMARK BUT STRENGTHENS IT MORE SLOWLY BY SATURDAY

MORNING...THEN PUSHES IT FARTHER OUT TO SEA.

ALTHOUGH MODELS ARE IN BETTER AGREEMENT WITH THE GENERAL

PATTERN...QUESTIONS REMAIN ABOUT THE IMPACT TO SENSIBLE WEATHER

DURING THIS TIME FRAME. INCREASED POPS TO HIGH CHANCE (AROUND 40

PERCENT) FRIDAY AND SATURDAY...THEN DOWN TO SLIGHT CHANCE SATURDAY

NIGHT AS THE SYSTEM MOVES FURTHER EAST. ANY SNOW FRIDAY WOULD

LIKELY BE ASSOCIATED WITH THE WEAKENING LOW OVER THE NORTHEAST

U.S...WHILE ANY SNOW FRIDAY NIGHT AND SATURDAY WOULD COME FROM THE

OFFSHORE LOW. QPF FROM THE 00Z RUNS IS RELATIVELY LIGHT...WITH THE

GFS KEEPING ALL SIGNIFICANT PRECIP OFFSHORE EXCEPT FOR SOME

WRAP-AROUND SNOW ENTERING THE REGION FROM THE NORTH SATURDAY. THE

ECMWF SOLUTION OFFERS ONLY AROUND 1/4 OF AN INCH OF QPF...BUT MUCH

MORE SIGNIFICANT PRECIP JUST OFFSHORE. AT THIS TIME...CONFIDENCE

WITH THE OVERALL IMPACT OF THIS SYSTEM REMAINS LOW.

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To me the problem with the models is still the timing and handling of the SPV. The H5 low moves too far to the north for there to be a major storm center close to the coast. The GEFS means have come closer to the coast then yesterday but is still pretty far east. 00z EURO ensemble means are still more east as well as the 00z CMC, although recent trends have shown that this model is bring the H5 low further south. 00z EURO is better, however might be too progressive as well as the latest 6z GFS. 00z NOGAPS is more out to sea with the storm center. 00z GFS looked good, although has started its own trend east. 00z and 6z NAM continue to show timing issues as the SPV moves southward into the Great Lakes. Again the timing of shortwaves and the southern jet disturbance is really killing the positioning of the H5 low. It will take anothe 48 hours before we get into the better details of such a storm. This still has plenty of time to trend further south, I think the final track of the H5 low is from 37n:75w to 40n:70w.

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