September 2025 OBS-Discussion centered NYC subforum

[LibertyBell]

Just now, bluewave said:

The dense tree growth is keeping the under 100° days record going.

 

 

Number of Consecutive Days Max Temperature < 100 
for NY CITY CENTRAL PARK, NY
Click column heading to sort ascending, click again to sort descending.

Period of record: 1869-01-01 to 2025-09-26
1	4818	2012-07-19 through 2025-09-26
2	4609	1881-11-11 through 1894-06-24
3	4022	1966-07-14 through 1977-07-17
4	4015	1980-07-22 through 1991-07-19
5	3261	1957-07-23 through 1966-06-26
6	3252	2001-08-10 through 2010-07-05
7	2904	1918-08-08 through 1926-07-20
8	2844	1903-09-19 through 1911-07-02
9	2219	1911-07-04 through 1917-07-30
10	1475	1944-08-12 through 1948-08-25

 

 

we will need July 2011 type heat to hit 100 at NYC.

[Dark Star]

43 minutes ago, cleetussnow said:

There are multiple unlivable conditions all over the world already.  Which is why people don’t live there.  Never have.  

The problem with trying to predict weather related catastrophes, is that it is continually being done.  This gives fuel to the opposition and make the global temperature side look foolish.  

[Sundog]

Rain cancel

[SACRUS]

 

 

[donsutherland1]

As of 4:30 pm, some showers were working their way into southern New Jersey. Cape May was receiving light rain. Some of these showers could each the New York City area tonight.

Showers and light rain are possible tonight into tomorrow. Rainfall amounts should be light. Above normal temperatures will continue through the remainder of September. 

The start of October could see the arrival of the coolest air mass so far this season, but temperatures will likely quickly moderate.

The guidance and historical experience following a second half September mean temperature of 70° or above suggest that October will be warmer than normal in the New York City area. The two most recent Octobers with a cooler than normal first half like 2025 and a second half with a mean temperature of 70° or above were: 2017 (October mean temperature: 64.1° and October 2019: October mean temperature 59.9°).

The probability that TD9 will approach the South Carolina coast but then turn out to sea from there is increasing on account of the expected Fujiwhara interaction with the stronger Humberto. That is now the most likely outcome, even as there remains a possibility of landfall. Even without landfall, the storm would bring periods of heavy rain, gusty winds, and pounding surf to coastal areas.

The ENSO Region 1+2 anomaly was 0.0°C and the Region 3.4 anomaly was -0.4°C for the week centered around September 17. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.03°C and the ENSO Region 3.4 anomaly has averaged -0.38°C. La Niña conditions will likely develop during mid- or late-autumn.

The SOI was +2.85 today. 

The preliminary Arctic Oscillation (AO) was +0.807 today. 

Based on sensitivity analysis applied to the latest guidance, there is an implied near 99% probability that New York City will have a warmer than normal September (1991-2020 normal). September will likely finish with a mean temperature near 70.3° (1.1° above normal). 

Supplemental Information: The projected mean would be 2.3° above the 1981-2010 normal monthly value.

 

 

[donsutherland1]

Islip reached 82° today. That was its fifth 80° or above high during the second half of September. The last time there were at least as many such days during the second half of September was in 2017 when there were eight such days. The five days is also tied with 1998 and 2016 for the fifth highest number on record for the second half of September.

[LibertyBell]

43 minutes ago, donsutherland1 said:

Islip reached 82° today. That was its fifth 80° or above high during the second half of September. The last time there were at least as many such days during the second half of September was in 2017 when there were eight such days. The five days is also tied with 1998 and 2016 for the fifth highest number on record for the second half of September.

when did this warm stretch begin Don, the 20th?