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Which November will show up? November 2015 obs/discussion


dmillz25

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We are on track for the 9th El Nino November since 1900 that NYC finishes at or above 50 degrees.

It's no surprise that so many of the warmest Novembers in NYC were El Nino years.

 

1902...51.6

1941...50.0

1963...50.4

1979...52.5

1982...50.4

1994...52.0

2006...51.9

2009...51.2

2015...?

 

A warm November doesn't say much about winter though. Snow totals in Central Park for those years:

 

1902-3...28.7" (14.4" in Dec.)

1941-2...29.5" (0.3" in Dec.)

1963-4...44.7" (11.4" in Dec.)

1979-80...12.8" (3.5" in Dec.)

1982-3...27.2" (3" in Dec.)

1994-5...11.8" (Trace in Dec.)

2006-7...12.4" (0" in Dec)

2009-10...51.4" (12.4" in Dec.)

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A warm November doesn't say much about winter though. Snow totals in Central Park for those years:

 

1902-3...28.7" (14.4" in Dec.)

1941-2...29.5" (0.3" in Dec.)

1963-4...44.7" (11.4" in Dec.)

1979-80...12.8" (3.5" in Dec.)

1982-3...27.2" (3" in Dec.)

1994-5...11.8" (Trace in Dec.)

2006-7...12.4" (0" in Dec)

2009-10...51.4" (12.4" in Dec.)

 

Yeah, there really isn't any correlation to JFM when the bulk of snow falls during the classic back-loaded

El Nino winter.

 

But it sometimes can be a different story in a La Nina winter when early warmth can be a negative sign

like we saw in November 2011 and 1999.

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Stormier El Nino pattern emerging this week as we see a coastal Tuesday followed by

a cutter on Thursday. Temps will still average a bit above normal this week until the cutter

drags down some colder temps for a more fall-like pattern next weekend.

that coastal crept up on the models. the nino stj is alive

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TROPICAL WEATHER OUTLOOK

NWS NATIONAL HURRICANE CENTER MIAMI FL

700 PM EST SUN NOV 8 2015

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

1. Showers and thunderstorms associated with a small low pressure area

located about 60 miles east-northeast of Mayaguana in the

southeastern Bahamas continue to show signs of organization. Recent

satellite images indicate that the circulation has become better

defined since this morning, and only a slight increase in

organization of the system would result in the formation of a

tropical depression or tropical storm tonight or Monday. Interests

in the Bahamas should monitor the progress of the low since a

Tropical Storm Warning may be required for a portion of the central

and northwestern Bahamas tonight or early Monday. Regardless of

development, locally heavy rainfall and gusty winds are likely

over portions of the Bahamas during the next day or so. An Air Force

Reserve hurricane hunter aircraft is scheduled to investigate this

system Monday morning.

* Formation chance through 48 hours...high...80 percent

* Formation chance through 5 days...high...80 percent

Forecaster Brown

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Today's Arctic Oscillation (AO) reading was +3.808. That broke the daily mark of +3.256, which was set in 1978. Today's figure is also the 12th highest on record for November. The record is +4.544, which was established on November 2, 1978.

 

The GFS ensembles indicate that the AO will peak in the next day or two and then decline. There are a cluster of ensemble members that take it negative to between -3.000 and -1.000 by the end of the 15-day period.

 

A period of blocking during the second half of November has occurred in the past with a number of El Niño events. Examples include the November 21-28, 1982 and November 21-December 5, 1997 periods. If blocking develops, a major issue will concern whether it will be sustained. Resolution of that question could provide insight into the predominant state of the AO during the winter. In the 1982 case, the blocking faded. In 1997, it predominated, but was overwhelmed by the East-based El Niño event. This time around, one is not dealing with an East-based El Niño (the new weekly data reinforces the basin-wide nature of the current event). A block also developed on November 29, 2009 and winter 2009-10 was historically blocky. 

 

In short, it's still too soon to be sure about the predominant state of the AO for the winter. No good measure exists for reliably predicting the AO from this far out, especially as the Snow Advance Index (SAI) has fared poorly the past two winters and the relationship between Eurasian snow trends in October and the AO may be weaker than first thought. In the larger context, the AO is one factor, but not the only one that will shape the winter outcome.

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