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Thanksgiving Week Nor'easter Discussion


Zelocita Weather

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This forecast is still a complete mess but if there's one thing to be counted on, it's the NAM overdoing precip.  Yeesh.

 

1 to 2 inches across the board would be great, though.  Even if localized amounts of 5 inches show up, I don't know how bad the flooding would really be given the dry conditions and the likely moderate rain rates.

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This forecast is still a complete mess but if there's one thing to be counted on, it's the NAM overdoing precip. Yeesh.

1 to 2 inches across the board would be great, though. Even if localized amounts of 5 inches show up, I don't know how bad the flooding would really be given the dry conditions and the likely moderate rain rates.

We actually have fairly decent model consensus more than 48 hours out. Sometimes at this point the gfs is still out to sea while the euro has a blizzard

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We actually have fairly decent model consensus more than 48 hours out. Sometimes at this point the gfs is still out to sea while the euro has a blizzard

 

I guess that's true, maybe I am expecting too much from the models.  I try to listen to the forecasters more, anyway.

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The wind details and warmth will be determined by how fast the southern stream ejects 

and the trough goes negative tilt. The strongest winds would occur with the southern

stream coming out a little faster leading to more deepening down by the Gulf Coast

and a more consolidated area of low pressure. The main difference between the 

models now are more strung out vs stronger surface low development.

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Way overdone, probably 1.5 to 2" with slightly higher local amounts.

and possibly alot less - with the track of the storm it is a possibility that there will be training of the heavy rain and there could be a wide range of precip amounts across the area

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I think this will turn into an event where we could see mixed precipitation starting and hanging on for even half of the event, even for PHL and NYC, with half a foot of snow just inland. The models are gradually trending away from a bullish 3"-6" of rain and more toward an inch or two....but I feel like we'll get mixing

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18z NAM floods NYC metro. Wasn't earlier this year when NAM showed 50+ inches of snow for Boston?

It had the right idea; albeit slightly displaced.

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I have a chance to be at 1,600 feet in elevation in Liberty NY from tomorrow night through next Sunday as opposed to Long Island's western Nassau county in Lynbrook.

Wish it was frozen here in Nassau/NYC but it won't be.

 

Anybody remember Thanksgiving day 1989 and the 6 inch plus surprise we had in NYC. LI?

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I have a chance to be at 1,600 feet in elevation in Liberty NY from tomorrow night through next Sunday as opposed to Long Island's western Nassau county in Lynbrook.

Wish it was frozen here in Nassau/NYC but it won't be.

Anybody remember Thanksgiving day 1989 and the 6 inch plus surprise we had in NYC. LI?

Yes but it wasn't a surprise. The forecast was for 3-6".

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Guest Imperator

Upton Excerpts:

 

AS A NORTHERN STREAM SHORTWAVE DIGS INTO THE GREAT LAKES REGION
MON NIGHT AND A CUTOFF LOW PRES SYSTEM IN THE SOUTHERN STREAM
TRACKS THROUGH THE SOUTHERN PLAINS...THE TWO WILL MERGE INTO A
DEEP UPPER LEVEL TROUGH WITH A STRENGTHENING SFC LOW TRACKING UP
THE SOUTHERN APPALACHIANS AND EAST COAST. THE PAST 3 RUNS OF THE
GFS HAS BEEN CONSISTENTLY IN AGREEMENT WITH A SOLN CLOSER TO THE
COAST...LIKE THE REMAINING GUIDANCE HAS BEEN INDICATING FOR THE
LAST FEW DAYS. IT DOES REMAIN THE EASTERNMOST SOLN OF ALL OF THE
GUIDANCE...WHICH HAS TRENDED A BIT FURTHER W OVER THE LAST 24
HOURS. THIS TREND WILL RESULT IN MILD TEMPERATURES ACROSS THE
AREA...WITH SOME WET SNOW POSSIBLE ON THE BACKSIDE AS THE STORM LIFTS
OUT. THIS WILL DEPEND ON HOW QUICKLY COLDER AIR WORKS IN AND IF
THERE IS STILL PRECIPITATION OCCURRING. MODELS ARE ALSO INDICATING
A SLIGHTLY WETTER SOLN. THE NAM HAS UPWARDS OF 5-7 INCHES ACROSS
WESTERN ZONES...BUT THINK THIS IS OVERDONE.
SEE HYDRO SECTION FOR
MORE INFORMATION ON AMOUNTS AND IMPACTS.

IN ADDITION TO THE RAIN...WHICH COULD BE MODERATE TO HEAVY AT
TIMES...WINDS WILL INCREASE AS WELL. INDICATIONS OF A 60-70 KT LLJ
EXIST...ALTHOUGH SOUNDINGS ARE INVERTED AND WOULD KEEP MUCH OF
THIS ALOFT.
BEHIND THE STORM...GUSTY NW WINDS WILL BE
LIKELY WED NIGHT INTO THU...BUT APPEAR TO BE SUB-ADVSY AT THIS TIME.


.HYDROLOGY...
A WIDESPREAD SOAKING RAIN IS BECOMING MORE LIKELY FOR THE TRI-
STATE AREA TUE AFTN THROUGH WED EVE WITH THE POTENTIAL FOR 2 TO 4
INCHES OF PRECIPITATION...MAINLY RAIN.
DUE TO THE PROLONGED PERIOD OF
DRY WEATHER/SOIL CONDITIONS...MAIN STEM RIVER FLOODING IS NOT
EXPECTED UNLESS RAINFALL AMOUNTS ARE HIGHER THAN CURRENTLY
FORECAST. MINOR URBAN AND SMALL STREAM FLOODING IS
LIKELY...ESPECIALLY WHERE LEAVES ARE CLOGGING STORM DRAINS.
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I have a chance to be at 1,600 feet in elevation in Liberty NY from tomorrow night through next Sunday as opposed to Long Island's western Nassau county in Lynbrook.

Wish it was frozen here in Nassau/NYC but it won't be.

 

Anybody remember Thanksgiving day 1989 and the 6 inch plus surprise we had in NYC. LI?

Yes , I do but as I recall it was the last and biggest snowfall for that winter season, we had a frigid December and January but every storm went south of us or ots.

P.s. Let us know how the weather does up there I spend my summers for the last 30 years in the mountains , near loch sheldrake at 1,530 ft or so I gotta go up once in the wintertime.

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The key now if this 2nd low really is going to happen is to get the first storm as deep as we can possibly get it to try and turn the upper trough more negative which hence would allow more cold air to spill in from west and get the next storm to have a shot at giving us snow...its gonna take alot but its possible.

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The key now if this 2nd low really is going to happen is to get the first storm as deep as we can possibly get it to try and turn the upper trough more negative which hence would allow more cold air to spill in from west and get the next storm to have a shot at giving us snow...its gonna take alot but its possible.

Yea im looking at the same possibility, also if the second low was a few hours slower and slightly more east

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