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November 2018 Discussions & Observations Thread


Rtd208

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1 hour ago, Brian5671 said:

we want storms-that's what's important right now-some of our snowiest winters had a parade of November cutters....

Exactly, that’s why we have had how many big November snow storms in most of our life times? The Thanksgiving storm in the late 80s and the post sandy storm. Maybe above 1k NW of the city there have been a couple more. The fact that we have some cold air in play is a good sign. 

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1 hour ago, LongBeachSurfFreak said:

Exactly, that’s why we have had how many big November snow storms in most of our life times? The Thanksgiving storm in the late 80s and the post sandy storm. Maybe above 1k NW of the city there have been a couple more. The fact that we have some cold air in play is a good sign. 

Don't forget the day before T-giving 2014. I had a foot here. 

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8 minutes ago, gravitylover said:

Don't forget the day before T-giving 2014. I had a foot here. 

Hence my NW of the city. Late season storms are much more common then early for the coast. It’s really simple, the offshore waters are still warm in November. Just look at October 11 with SE queens getting more snow then the north shore hills of Nassau which average close to 10” more a season. 

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November is keeping it's reputation during the 2010's as a month where cold starts to battle with with the fall warmth. Only 1 September since 2010 in a NYC with a slightly colder than average temperature. All the Octobers have been warmer than normal. But in recent years, we have seen how the -EPO has introduced more fall cold than has been the case for September and October. So after a warm start to November, it looks like the middle portion of the month will average out colder than normal. 

Cool down #1 

ecmwf-ens_T850a_us_5.thumb.png.f02e2e50f2045880fd402a6e8b1fd629.png

Cool down #2

ecmwf-ens_T850a_us_9.thumb.png.3bb3888f89b599e677bc91060fd34f51.png

 

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For the second month in a row, the first week was exceptionally warm in the New York City area.  During the November 1-7 period, New York City had a mean temperature of 56.9°, which ranked 16th warmest on record for that period.  This was also the warmest November 1-7 period following an October 16-31 period when NYC had a mean temperature below 50°. Just as had been the case in October, a period of colder than normal weather appears likely to follow.

Such warmth during the first week of November does not necessarily mean that the winter will experience below normal snowfall. Since 1869, New York City has had 20 prior cases where the temperature averaged 56.0° or above during the first week in November. Mean snowfall for the winter ahead was 25.0" and median snowfall was 23.4".

However, if one broke those cases into subsets, December snowfall provided a powerful clue as to the overall seasonal snowfall. In cases where December saw 1.0" or more snow, the respective mean and median seasonal snowfall figures were 31.1" and 31.9". 54% of such cases saw 30" or more snow while 23% saw less than 20".  The mean and median figures were even higher from that subset following Novembers with 4.00" or more precipitation as appears likely to be the case this year. However, when it comes to the wet November cases within this subset, a lot of caution is required due to potential sample size issues.

In contrast, in the cases where less than 1.0" snow fell in December, the respective mean and median figures were 15.8" and 15.5". In that subset, 13% of winters saw 30" or more snow while 75% saw less than 20".

 

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Recent guidance, including the 12z NAM and GFS suggest that cities such as Islip, New York City, Newark, Philadelphia, and Providence will likely receive a general 1.00" to 2.00" rain during the November 9-10 timeframe.

Already, 2018 ranks among the 30 wettest years on record in most of those locations. In some, it ranks among the 10 wettest years.

Further south, Baltimore has already had its 3rd wettest year on record. 2018 will likely set a new record by the time the year concludes. Washington, DC has had its 6th wettest year on record. Wilmington, NC, where 90.45" rain has fall through early this morning has had its wettest year on record by far.

A regional snapshot of year-to-date precipitation and rankings for various precipitation amounts from the upcoming system is below.

NYCPrecip11082018.jpg

 

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28 minutes ago, NJwx85 said:

Real heavy rain threat appears to be Monday.

Models are in near unanimous agreement on high pressure overhead Monday; perhaps you meant Tuesday? Both tomorrow's and Tuesday's systems have a redeveloping low passing near the city, PWATs above 1.5" and a low level jet focus, so the heavy rain threat is legit both days. Fortunately, they're both quick movers, so anything over ~1.5" should be highly localized.

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14 minutes ago, purduewx80 said:

Models are in near unanimous agreement on high pressure overhead Monday; perhaps you meant Tuesday? Both tomorrow's and Tuesday's systems have a redeveloping low passing near the city, PWATs above 1.5" and a low level jet focus, so the heavy rain threat is legit both days. Fortunately, they're both quick movers, so anything over ~1.5" should be highly localized.

Yes sorry meant Tuesday.

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