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November 2017 Discussions & Observations Thread


Rtd208

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According to the most recent ensemble guidance, an air mass that is 1.5σ to 2.0σ below normal is forecast to move through the region on November 11. Such an air mass would suggest near record to perhaps record low temperatures in New York City and its suburbs.

In addition, the latest ensemble guidance is now providing a fairly high confidence idea that the Arctic Oscillation (AO) could become negative to strongly negative after November 10. With wave lengths beginning to lengthen, such an outcome would suggest somewhat colder readings than would be typical.

As a result, even as November still appears likely to finish warmer than normal, the implied probability of such an outcome is lower than it was at the beginning of the month. Furthermore, the implied probability of the month's averaging 50° or above has fallen to about 1-in-3. The probability of a record warm autumn has also fallen.

After November 20, it remains to be seen whether the forecast blocking will be sustained. If it is, the month could end on a cold note. If not, a warmer and possibly zonal pattern could develop. The CFSv2 favors the redevelopment of warmth. However, until recently, it did not pick up on the development of what will likely be a cold period commencing later this week.

AO11062017.jpg

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7 minutes ago, nesussxwx said:

 

RGEM gives a inch. Most likely won't happen but it's good to see some support.

image.thumb.png.0bb437c7b7568efe0dbff8706be71d66.png.84210f12f426a9f39e2298632e18ada3.png

I would go with a few flakes for the interior with a slight possibility of a slushy accumulation for the highest spots. Animal prob has the best shot out of all of us of seeing any accumulation

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2 hours ago, Animal said:

 

Is this legit. Saw a few post about snow possible mid week and sunday.

Mt Holly NWS has not mention of it.

UPTON

The first forecast challenge is precipitation chances Tuesday night.
A series of lows will develop along the frontal boundary south of
the region through the middle of the week. The first of these passes
Tuesday night into Wednesday. The GFS is a glancing blow. The NAM
has a decent band of moderate precipitation over the area. The ECMWF
is dry. The non-NAM solution has been favored by WPC, but with the
latest SREF coming in with 25-50% chance of measurable, slight
chances have been included in the forecast for the southern 2/3 of
the area. The SREF even has low probabilities for measurable snow
across portions of the Hudson Valley. If wetter scenario does
develop, some wet snow cannot be ruled out over the interior.
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The 12z GFS was even colder than its 0z and 6z runs for November 11. Forecast low temperatures for November 11 (11/6/2017 12z MOS ) included:

Albany: 8° (Record: 15°)
Bridgeport: 23° (Record: 22°)
Danbury: 15° (Record: 14°)
Islip: 23° (Record: 24°)
New Haven: 22° (Record: 16°)
New York City:
…JFK: 24° (Record: 19°)
…LGA: 26° (Record: 29°)
…NYC: 24° (Record: 28°)
Newark: 20° (Record: 25°)
Poughkeepsie: 14° (Record: 13°)
Westhampton: 16° (Record: 21°)
White Plains: 17° (Record: 20°)

 

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12 hours ago, Eduardo said:

Was wondering when we could expect your return, Paul.

I understand it's only November 6th, but any December thoughts just yet?

Great to have you back!!

Colder and more active than the last 2.

We should get off to a fast start.

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9 minutes ago, Brian5671 said:

Just your run of the mill AO drop to 4SD negative....

-NAO/-AO pattern sets up mid month. Look for a big storm the week prior to Thanksgiving as things begin to rebound. Until then it will probably be unseasonably cold and relatively boring around here.

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