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October 2021


Stormlover74
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20 minutes ago, bluewave said:

The main question for the weekend forecast is if the NAM is correct about the inverted trough feature? This is displaced on the NAM well NW of the low. It could result in some locally heavier rainfall near our area. Probably need to wait another few runs to know for sure. But models like the Euro were off and on with this potential inverted trough rainfall enhancement.


A7B347F9-EAB5-43EE-908C-A82211C98CF8.thumb.gif.7638ab79ff13e18b6b89ac565bfa91e1.gif


 

 

those often end up north and east of where modeled as well.  (Assuming it happens at all)

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14 hours ago, donsutherland1 said:

Right now, it looks as if showers and light rain will arrive Sunday morning near 8 am and on and off light rain will persist into the evening. Total rainfall will be somewhere around 0.50”. I wish things looked better. We’ll see what the overnight guidance shows.

Any realistic updates for Sunday, weather friends, or still TBD? Thanks!

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76° at Islip. This establishes a new annual record of 121 days reaching 75° or warmer. The high of 76° so far is average for September 10th.

MacArthur/ISP  PTSUNNY   76  

Time Series Summary for ISLIP-LI MACARTHUR AP, NY - Jan through Dec
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Number of Days Max Temperature >= 75 
Missing Count
  2021 121 84
  2007 120 0
  1991 120 0
  2010 118 0
  2011 117 0
  2005 116 0
  2001 116 0
  2016 115 0
  2015 115 0

 

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4 minutes ago, Brian5671 said:

might end up like the late Sept cooldown a couple days near or below normal....

Yup. You can see at the end of the euro another trough diving into the west coast. Might just be a long enough cool down to remember what fall feels like lol

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3 hours ago, JSG5010 said:

Any realistic updates for Sunday, weather friends, or still TBD? Thanks!

The National Blend of Models has about a quarter inch of rain, mainly from afternoon showers. There remains higher than usual uncertainty as to the potential development and placement of an inverted trough. 

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Today was another unseasonably warm day. Temperatures rose into the middle and upper 70s across the region today. Newark reached 70° for the 163rd time this year. As a result, 2021 is tied for 13th place with 2001 and 2011.

Tomorrow will be slightly cooler. Temperatures will generally top out in the middle and upper 60s. Some rain is possible, especially during Sunday afternoon. Overall, the generally warm regime will continue into at least mid-month.

In the Northern Plains and Upper Midwest, the first week of October was exceptionally warm. Some temperatures and rankings for the first week of October:

Billings: 63.9° (5th warmest)
Bismarck: 64.5° (2nd warmest)
Duluth: 60.5° (old record: 59.3°, 1963)
Fargo: 63.9° (tied, 3rd warmest)
Glasgow, MT: 64.4° (2nd warmest)
Green Bay: 64.4° (3rd warmest)
International Falls: 60.1° (3rd warmest)
Madison: 67.2° (4th warmest)
Milwaukee: 68.4° (3rd warmest)
Minneapolis-St. Paul: 66.0° (5th warmest)

Fall 2021 will likely be wetter to much wetter than normal in the northern Middle Atlantic region. Since 1869, there have been 9 August cases where New York City picked up 20.00" or more rainfall during the summer. Two thirds of those cases (and 4/5 of those with summer mean temperatures of 73.0° or above) had 17.00" or more fall precipitation in New York City. 2011 is probably the closest match in terms of precipitation and a nearly identical summer mean temperature. Mean fall precipitation for those 9 cases was 14.86". The median was 17.35". The 1991-2020 normal value is 12.27".

Following very wet July-September periods, winter (December-February) precipitation has typically been near or below normal. The most recent exception was winter 2018-19.

The ENSO Region 1+2 anomaly was 0.0°C and the Region 3.4 anomaly was 0.0°C for the week centered around September 29. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +0.07°C and the ENSO Region 3.4 anomaly has averaged -0.28°C. Neutral ENSO conditions will likely yield to La Niña conditions later this month.

The SOI was +13.08 today.

The preliminary Arctic Oscillation (AO) figure was -0.524 today.

On October 6 the MJO was in Phase 5 at an amplitude of 2.147 (RMM). The October 5-adjusted amplitude was 1.963 (RMM).

Based on sensitivity analysis applied to the latest guidance, there is an implied 83% probability that New York City will have a warmer than normal October (1991-2020 normal). October will likely finish with a mean temperature near 62.0° (4.1° above normal).

 

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Next / last chance of 80s looks possible next Thu (10/14) / Fri (10/15) ahead of strong cold front and perhaps the coolest air of the season so far as currently modeled Sat (10/17) and into the next week 10/17.  Beyond there moderation / warmer returns to not to long after.   We'll see if we can clear and get a late season 80s in the warmer spots and then how cool we can go in the 1/17 to 10/22 period.

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