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October 2021


Stormlover74
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4 hours ago, snowman19 said:

It’s been awhile since we’ve seen the -PMM/-PDO pattern, it broke in early 2013 and hasn’t been back since now 

The latest extended EPS keeps the warm +EPO going well into October. Some hints that the pattern may try to go more -EPO/-AO  in November. But that is a long way out for the weeklies. 
 

Oct 11-18

3898930B-BAEE-4725-90DA-2E925B44ACB8.thumb.png.2b284f025a83a539275fcf1e9e7702fc.png
 

FCB26C4D-4BDE-4DE3-8020-7200D5CF0CE9.thumb.jpeg.199650ceac354b85a686dcd45443b243.jpeg
 

Pattern change for November?

Nov 8-15


A30BFBDE-2354-4E23-90C3-BCD0FCAF282E.thumb.jpeg.96a5bfdfbfdd0211d6335033dae66385.jpeg

 

 

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Under partly sunny skies, temperatures rose into the lower and middle 70s today. Newark reached 70° for the 162nd time this year. As a result, 2021 is tied for 15th place with 1959 and 1989.

Tomorrow will be variably cloudy and very warm. The temperature will likely reach the middle and possibly upper 70s. Slightly cooler air will return for the weekend. Some rain is possible on Sunday. Overall, the generally warm regime will continue into at least mid-month.

Bismarck concluded its 2nd warmest opening week of October on record with a mean temperature of 64.5°. The record of 65.1° was set in 2011. In addition, the October 1-7 average high temperature was 82.3°. That set a new 7-day October record. The old record of 81.9° was set during October 7-13, 1934. Records go back to 1874.

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 +14.12 today.

The preliminary Arctic Oscillation (AO) figure was -0.340 today.

On October 5 the MJO was in Phase 5 at an amplitude of 1.968 (RMM). The October 4-adjusted amplitude was 1.841 (RMM).

Based on sensitivity analysis applied to the latest guidance, there is an implied 82% 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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1 hour ago, donsutherland1 said:

Hello… looking for some help in getting the truest sense of weather here in NYC (UES) for Sunday, 10/10. Everything looks dicey at best, and we’re debating how to handle my daughters outdoor birthday party. We have some planning commitments which won’t allow us to play it by ear and sort of need to make a decision by tomorrow (Friday) evening at the latest. Any help would be most appreciated! Thank you

 

 

 

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12 hours ago, SnoSki14 said:

Next week could easily put up the highest anomalies but the following week looks much cooler. 

It's too early to tell of course but tellies suggest cooler weather is coming.

Raindancewx brought up 2011 as far as the ENSO state goes and we all know what happened that October.

cool weather will come after Halloween, probably not before

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Morning thoughts…

After some early fog in a few locations, today will be partly sunny and warm. High temperatures will likely reach the middle and even upper 70s in most of the region. Likely high temperatures around the region include:

New York City (Central Park): 73°

Newark: 77°

Philadelphia: 77°

Normals:

New York City: 30-Year: 67.4°; 15-Year: 68.6°

Newark: 30-Year: 69.0°; 15-Year: 70.4°

Philadelphia: 30-Year: 70.2°; 15-Year: 71.3°

A generally warmer than normal regime will continue into at least mid-month.

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The next 8 days are averaging 69degs.(64/75), or +8.

The next 10 days look like all 70+,* with little rain.  *except the weekend with east winds.

Travelling 5-Day periods starting the 25th should be near to---or BN up to this time in November. 

Reached 77* here yesterday.

Today:   74-77, p. cloudy, wind n. to e.

63*(95%RH) here at 6am.       66* at 9am.      70*/71* at Noon.        73* at 3pm.

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Several more fall temperature benchmarks still haven’t been reached around the area with the warmth. NYC is yet to see the first 40s of the season and POU hasn’t had any 30s. So these firsts for the fall will be near the latest on record at both locations. This is in top of the already later average first dates since the 1951-1980 climate period.

NYC latest first 40s 
 

First/Last Summary for NY CITY CENTRAL PARK, NY
Each section contains date and year of occurrence, value on that date.
Click column heading to sort ascending, click again to sort descending.
Year
Last
Value
First
Value
Difference
2005 05-25 (2005) 48 10-20 (2005) 49 147
2017 05-14 (2017) 46 10-16 (2017) 46 154
1995 05-11 (1995) 48 10-16 (1995) 48 157
1955 05-18 (1955) 48 10-16 (1955) 46 150
1969 05-27 (1969) 49 10-15 (1969) 46 140
1898 05-10 (1898) 47 10-15 (1898) 49 157


POU latest first 30s

 

First/Last Summary for Poughkeepsie Area, NY (ThreadEx)
Each section contains date and year of occurrence, value on that date.
Click column heading to sort ascending, click again to sort descending.
Year
Last
Value
First
Value
Difference
1939 05-19 (1939) 39 10-15 (1939) 32 148
2018 05-01 (2018) 38 10-13 (2018) 38 164
1931 05-04 (1931) 34 10-11 (1931) 39 159
2015 05-14 (2015) 35 10-10 (2015) 39 148
2002 05-23 (2002) 36 10-08 (2002) 36 137
2011 05-08 (2011) 38 10-06 (2011) 36 150


Fall temperature benchmarks getting later over time
 

NYC average first 40s….2010-2020….10-05…..1951-1980….09-24

POU average first 30s….2010-2020….09-27…..1951-1980….09-17

 

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