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NYC/PHL: January 25-27 Potential Bomb Part 4


earthlight

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Does the MJO have to do anything with this storm? It's now in phase 7, moving a long into phase 8.

phase.Last90days.gif

As you probably know, Phase 8 is the best phase for a snowstorm on the east coast. Phase 7 is alright also (12/19/2009 was a P7 storm) but P8 storms tend to amplify more.

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congrats to Jay. Here is Upton's Take

STILL QUITE A BIT OF MODEL SPREAD WITH THE STORM SYSTEM THAT LIKELY

WILL IMPACT THE REGION FROM LATE TUESDAY NIGHT INTO THURSDAY.

SOLUTIONS RANGE FROM JUST A GRAZING OF FAR SE PORTIONS OF THE CWA IN

THE GFS (TRACK WELL SE OF THE 40/70 BENCHMARK)...TO FREEZING RAIN

ACROSS THE LOWER HUDSON VALLEY WITH POSSIBLY FLOODING RAINS

ELSEWHERE IN THE CMC-GLOBAL (TRACK OVER THE POCONOS/LOWER HUDSON

VALLEY). WITH THESE SOLUTIONS BEING THE OUTLIERS...HAVE OPTED FOR A

BLEND OF THE MORE CONSISTENT ECMWF AND GEFS MEAN WHICH HAVE A STORM

TRACK JUST NW OF THE BENCHMARK. THERE ARE DIFFERENCES EVEN BETWEEN

THESE SOLUTIONS...WITH THE ECMWF WARMER IN THE LOW LEVELS THAN THE

GEFS MEAN. WITH THE ECMWF TRENDING COLDER...OPTED FOR A 70/30 BLEND

OF ECMWF TO GFS LOW LEVEL THERMAL FIELDS TO DETERMINE P-TYPE. WHILE

THERE COULD BE A NARROW RIBBON OF FREEZING RAIN AND SLEET...HAVE

OPTED TO KEEP THINGS RAIN/RAIN-SNOW MIX/SNOW FOR NOW FOR BOTH

SIMPLICITY AND TO REFLECT UNCERTAINTY.

AN UNCERTAIN FORECAST TO SAY THE LEAST.

THE MODELS ALL AGREE THAT A LOW FORMS OVER THE SOUTHEASTERN US

TUESDAY NIGHT IN RESPONSE TO A PHASING OF THE NORTHERN AND SOUTHERN

STREAMS INTO A TROUGH/POSSIBLE CLOSED 500 HPA LOW THAT SHOULD BE

AROUND NORTHERN AL/GA BY 12Z WEDNESDAY. THE LOW THEN TRACKS

NORTHEAST AND DEEPENS WITH THE 500 HPA SYSTEM...TRACKING TO EAST OF

CAPE COD BY 12Z THURSDAY.

MOST OF TUESDAY NIGHT SHOULD BE DRY IN THE WAKE OF A DEPARTING LOW.

HELD OF ON CHANCE POPS FROM THE STORM UNTIL LATE TUESDAY NIGHT AS A

RESULT...PRIMARILY AS SNOW...THOUGH COULD SEE A MIX ALONG THE

IMMEDIATE COAST OF LONG ISLAND. INCREASE POPS TO LIKELY BY WEDNESDAY

AFTERNOON...WITH SNOW ACROSS THE NORTHERN TIER OF THE CWA AND A RAIN

SNOW MIX ELSEWHERE. GRADUALLY CHANG PRECIPITATION TO ALL SNOW FROM

NW TO SE WEDNESDAY NIGHT AS THE COASTAL LOW PULLS TO THE E/NE. LIGHT

SNOW SHOULD THEN TAPER OFF FROM W TO E THURSDAY MORNING.

THERE IS THE POTENTIAL FOR A SIGNIFICANT SNOWFALL ACROSS THE REGION

AS A RESULT...WITH THE BEST CHANCE ACROSS THE NORTHERN 1/4 OF THE

CWA...AND THE LOWEST POTENTIAL ACROSS THE SOUTH SHORE AND TWIN FORKS

OF LONG ISLAND. THIS THREAT WILL BE HIGHLIGHTED IN THE HWO. THERE IS

AN EVEN SMALLER POSSIBILITY OF MINOR URBAN/POOR DRAINAGE

FLOODING...ESPECIALLY IN THE REGION WITH THE LOWEST CHANCE OF

SIGNIFICANT SNOWFALL.

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18z GEFS means are good if you like snow near the coast. It's certainly an interesting situation setting up here between the 12z ECMWF and it's ensembles, as well as the GEFS means and NAM. The SREF shouldn't really be too heavily weighted at this point, especially the mean. The individual members are a complete wreck with some very far west, and some very far east..yielding a mean which looks fantastic. Those are things you need to be wary about when using ensembles.

The GFS ensembles at 12z, I figured were the same deal..with some left and some right yielding a mean somewhere in between. That's not the case...probably 8-10 of the 12 have significant snowstorms. Still a whole lot to sort out as we sit here 78 hours away.

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congrats to Jay. Here is Upton's Take

STILL QUITE A BIT OF MODEL SPREAD WITH THE STORM SYSTEM THAT LIKELY

WILL IMPACT THE REGION FROM LATE TUESDAY NIGHT INTO THURSDAY.

SOLUTIONS RANGE FROM JUST A GRAZING OF FAR SE PORTIONS OF THE CWA IN

THE GFS (TRACK WELL SE OF THE 40/70 BENCHMARK)...TO FREEZING RAIN

ACROSS THE LOWER HUDSON VALLEY WITH POSSIBLY FLOODING RAINS

ELSEWHERE IN THE CMC-GLOBAL (TRACK OVER THE POCONOS/LOWER HUDSON

VALLEY). WITH THESE SOLUTIONS BEING THE OUTLIERS...HAVE OPTED FOR A

BLEND OF THE MORE CONSISTENT ECMWF AND GEFS MEAN WHICH HAVE A STORM

TRACK JUST NW OF THE BENCHMARK. THERE ARE DIFFERENCES EVEN BETWEEN

THESE SOLUTIONS...WITH THE ECMWF WARMER IN THE LOW LEVELS THAN THE

GEFS MEAN. WITH THE ECMWF TRENDING COLDER...OPTED FOR A 70/30 BLEND

OF ECMWF TO GFS LOW LEVEL THERMAL FIELDS TO DETERMINE P-TYPE. WHILE

THERE COULD BE A NARROW RIBBON OF FREEZING RAIN AND SLEET...HAVE

OPTED TO KEEP THINGS RAIN/RAIN-SNOW MIX/SNOW FOR NOW FOR BOTH

SIMPLICITY AND TO REFLECT UNCERTAINTY.

AN UNCERTAIN FORECAST TO SAY THE LEAST.

THE MODELS ALL AGREE THAT A LOW FORMS OVER THE SOUTHEASTERN US

TUESDAY NIGHT IN RESPONSE TO A PHASING OF THE NORTHERN AND SOUTHERN

STREAMS INTO A TROUGH/POSSIBLE CLOSED 500 HPA LOW THAT SHOULD BE

AROUND NORTHERN AL/GA BY 12Z WEDNESDAY. THE LOW THEN TRACKS

NORTHEAST AND DEEPENS WITH THE 500 HPA SYSTEM...TRACKING TO EAST OF

CAPE COD BY 12Z THURSDAY.

MOST OF TUESDAY NIGHT SHOULD BE DRY IN THE WAKE OF A DEPARTING LOW.

HELD OF ON CHANCE POPS FROM THE STORM UNTIL LATE TUESDAY NIGHT AS A

RESULT...PRIMARILY AS SNOW...THOUGH COULD SEE A MIX ALONG THE

IMMEDIATE COAST OF LONG ISLAND. INCREASE POPS TO LIKELY BY WEDNESDAY

AFTERNOON...WITH SNOW ACROSS THE NORTHERN TIER OF THE CWA AND A RAIN

SNOW MIX ELSEWHERE. GRADUALLY CHANG PRECIPITATION TO ALL SNOW FROM

NW TO SE WEDNESDAY NIGHT AS THE COASTAL LOW PULLS TO THE E/NE. LIGHT

SNOW SHOULD THEN TAPER OFF FROM W TO E THURSDAY MORNING.

THERE IS THE POTENTIAL FOR A SIGNIFICANT SNOWFALL ACROSS THE REGION

AS A RESULT...WITH THE BEST CHANCE ACROSS THE NORTHERN 1/4 OF THE

CWA...AND THE LOWEST POTENTIAL ACROSS THE SOUTH SHORE AND TWIN FORKS

OF LONG ISLAND. THIS THREAT WILL BE HIGHLIGHTED IN THE HWO. THERE IS

AN EVEN SMALLER POSSIBILITY OF MINOR URBAN/POOR DRAINAGE

FLOODING...ESPECIALLY IN THE REGION WITH THE LOWEST CHANCE OF

SIGNIFICANT SNOWFALL.

Had to laugh at that

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But, I thought this was guaranteed to be a rainstorm?

:lol:

What I said was that the modeling at the time frame with the high pressure situated directly east of the storm system would mean rain. There's still a good chance this thing is a wet event on the coast and immediate suburbs if you ask me. The high pressure slides offshore leaving an east/southeast flow in the boundary layer which means trouble. Areas further inland would be fine should the storm track along the offshore baroclinic zone as it has all year--but the areas which have been getting hammered would be too warm for a good bit of the storm.

That being said..the models have transitioned to a totally different H5 setup over the past few days. The cutoff low is gone, the high which was initially modeled to be due north of our storm and then slide east is now 500 miles east into the Atlantic by the time the storm gets towards us. So, like I said, we still have a ton to work out.

One encouraging thing was the Euro, being even a warm solution, closed off the 925mb low off Ocean City Maryland at 84 hours..with about 4 closed contours. That feature then rode northeast towards Nantucket. That's a terrific track for many people and could at least overcome the boundary layer problems. The Euro had everybody northwest of a line from of Brooklyn, Staten Island, and Trenton staying below freezing the entire event at 925mb. H85 obviously torched so that could mean some sleet, but it's an interesting prospect to consider.

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But, I thought this was guaranteed to be a rainstorm?

I am no Moderator here, but c'mon guys take it easy. I think the rainier solutions are slowly going by the wayside based on the trends but not completely out of the picture just yet. We will see if we can thread the needle with this one, seasonal trend is in our favor. I would like to see the Euro shift 25-50 miles further east in track and be more gung ho with the High over the lakes as far as placing it further South and east as well as more gung ho on having the storm generate it's own cold air even moreso than the Euro depicted at 12z with the proper timing of course needed to bring snow to us all.

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