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1 hour ago, jm1220 said:

You can see that ESE-oriented precip crunch which means high pressure/confluence definitely at work. 

I think the reason the warm front was a little further south than forecast yesterday was due to the models underestimating the influence of the high pressure in New England.

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It will turn slightly cooler for the weekend with highs mainly in the upper 60s and Lower 70s.

Helene has brought historic rains to the Asheville area. Its 2-day total exceeded the highest amount recorded over 5 days and its 3-day total exceeded its highest 15-day figure prior to 2024. Atlanta picked up 3" or more rain on three consecutive days, which broke the record set during December 8-9, 1919 and tied during July 4-5, 1994.

In the Southwest and parts of California, near record and record heat continues. The extreme heat will last through the coming weekend. Phoenix and Tucson will experience their highest temperatures so late in the season.

Continuing long-range guidance suggests that October could wind up warmer than normal across much of the U.S. The western U.S. could be particularly warm relative to normal. Widespread October warmth occurred during the last case where the AO fell to -2.000 or below while the PNA rose to +1.000 or above with a cool ENSO Region 3.4 anomaly in late September (2010), as was the case this year.

The NAO fell to a preliminary -2.751 on September 24th (all-time September record: -2.371, September 12, 1971). That was the 9th lowest value on record. La Niña winters following September cases where the NAO fell to -1.900 or below featured a predominantly positive NAO. The most recent such winters were 2016-2017 and 2022-2023. The mean temperatures for those winters in New York City were 39.3° and 41.0° respectively. The 1991-2020 normal value is 36.2°. A warmer outcome is favored by the September run of the C3S multi-model forecast for Winter 2024-2025.

The ENSO Region 1+2 anomaly was +0.2°C and the Region 3.4 anomaly was -0.5°C for the week centered around September 18. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.20°C and the ENSO Region 3.4 anomaly has averaged -0.18°C. Neutral ENSO conditions will likely evolve into a La Niña event during the fall.

The SOI was +6.42 today.

The preliminary Arctic Oscillation (AO) was -0.304 today.

Based on sensitivity analysis applied to the latest guidance, there is an implied 57% probability that New York City will have a cooler than normal September (1991-2020 normal). September will likely finish with a mean temperature near 69.1° (0.1° below normal).

 

 

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Two day rainfall total here as of 8:00 this morning: .28".   All of it went to good use as it was a off and on periods of light rain and drizzle.

The rainfall along with cloudy skies and cooler temperatures making things look a little greener.  Leaves are changing with some good color getting underway.  Some of the maples are a a really nice reddish orange.

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8 hours ago, rclab said:

Two day Central Park total: ref NOAA/NWS .26. As always ….

Was enough to for NYC to drop to 3rd driest and Newark down to 2nd place.

 

Time Series Summary for NY CITY CENTRAL PARK, NY - Month of Sep
Click column heading to sort ascending, click again to sort descending.
1 1884 0.21 0
2 1914 0.29 0
3 2024 0.36 4
4 1885 0.41 0
5 2005 0.48 0
6 1941 0.51 0
7 1895 0.62 0
8 1951 0.70 0
9 2019 0.95 0
10 1881 0.97 0


 

Time Series Summary for NEWARK LIBERTY INTL AP, NJ - Month of Sep
Click column heading to sort ascending, click again to sort descending.
1 1941 0.14 0
2 2024 0.15 3
3 2005 0.45 0
4 1951 0.95 0
5 1972 1.03 0
6 1948 1.14 0
- 1939 1.14 0
7 1931 1.19 0
8 1953 1.25 0
9 1964 1.30 0
10 1967 1.35 0
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6th straight days of clouds and 0.19 in the bucket not a good trade off.   Likely 4  / 5 more days of clouds and maybe that total is doubled to  0.5 or 0.75 of rain with what will then be 12 straigh days of clouds.  Drier / sunnier by later Wed.  Looking warmer than normal till around the 7/8th.  Watch the GOM (TX/C-GC) for next tropical opportunity.

 


GOES16-NE-GEOCOLOR-600x600.gif

 

  

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2 hours ago, Allsnow said:

.30 overnight with light rain still falling 

A lot of dreariness without much to show for it. Remains me of a warmer version of March/April. 

Models showing Gulf activity too. Wouldn't surprise me to see tropical activity preceding cooler weather next month. 

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54 minutes ago, coastalplainsnowman said:

I suppose would be for the forthcoming October thread, but maps like this have been a rarity lately and something I love to see in October, short lived as it may or may not be:

 

image.png.0037d83b35c402379f1a1e5ed832558a.png

Great .  Cool fall and then pattern flip right around december 23.  

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3 minutes ago, bluewave said:

Just got a few breaks of sun here as the high pressure over New England is slowing the progress of the moisture coming north. 
 

IMG_1395.thumb.jpeg.6d60ae246993a906e4861eeadc46ccd2.jpeg
 


 

Stuck in the muck here but sun out near Del and Cape May

 

vis_nj_anim.gif

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