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NWS UPTON, 5 to 7 inch possibility

IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations.

ADDITIONAL DETAILS... - Showers with heavy downpours and a few thunderstorms early Sunday morning into midday Sunday may lead to flooding. Average rainfall amounts are forecast to range from 1.5 to 3 inches with locally higher amounts of 5 to 7 inches possible. Peak hourly rates could reach 2 to 2.5 inches.

 

- http://www.weather.gov/safety/flood PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

 

 

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Rain will arrive tonight. A general 1.00"-2.00" rainfall with locally higher amounts in excess of 3.00" appears likely.

Clouds will break tomorrow with the mercury rising into the upper 70s. However, the coolest air mass so far this season will then push into the region to begin the work week. Highs Monday through Wednesday will reach the lower and middle 70s. New York City will see lows in the upper 50s to lower 60s. As a result, Central Park will experience its first reading below 60° this season. the timing matches well with the last two El Niño events: 2015-2016: September 14 and 2023-2024: September 15.

Wednesday through Friday will see temperatures recover mainly to the upper 70s. However, additional cool air will likely arrive some time during the next weekend.
 
The ENSO Region 1+2 anomaly was +4.6°C and the Region 3.4 anomaly was +2.7°C for the week centered around September 2. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +4.12°C and the ENSO Region 3.4 anomaly has averaged +2.57°C. The ongoing strong El Niño, will continue to strengthen through the mid-fall. The Region 1+2 anomaly surpasses the all-time record of +4.5° that was set during the week centered around June 29, 1983. 

The SOI was -29.77 today.

The preliminary Arctic Oscillation (AO) was +1.761 today. 

Based on sensitivity analysis applied to the latest guidance, there is an implied near 50% probability that New York City will have a warmer than normal September (1991-2020 normal). September will likely finish with a mean temperature near 69.2° (near normal). 

Supplemental Information: The projected mean would be 1.2° above the 1981-2010 normal monthly value. 

 

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47 minutes ago, mikeysed said:

Any short range models showing anything interesting?

0z HRRR has some spots getting 2 to 3 inches of rain while other spots get just a tenth to quarter inch. It looks like your typical summer downpours situation with some areas getting a lot of rain and other areas getting a little. Of course very difficult to predict which areas will get hard -- just have to watch radar. 

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2 hours ago, mikeysed said:

Any short range models showing anything interesting?

Looks like a kind of split screw setup-the heavy rain area over Central PA maybe hits the I-84 area, then NYC/LI has to see what happens with the heavy rain area further south near DC. Between those areas probably ends up with little. 

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20 hours ago, Keith Central PA said:

Mid 80's for mid September is not an endless summer.It's 10 degrees above normal. Happens every September. Now low to mid 90's is unusual

The definition we use for endless summer in the fall is highs of 80° or warmer. This year got off an early start for 80s back in March. So many locations across the region are in the top 5 for 80° days this year.

The number Sep to Nov 80° days have more than tripled at the usual warm spots like Newark over their period of record. So now we just take a higher 80°+ days for granted in the fall.

2009 was the last time we had under 10 days reaching 80° during the fall at the locally warmer spots like Newark.

IMG_7602.thumb.jpeg.e220c698e111774e43bbb7bac79cbc8c.jpeg

 

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20 minutes ago, nycwinter said:

no way am i seeing mid 80's for late next week for nyc this will bust .

NYC isn’t considered one of the local warm spots these days due to the artificial cooling from the trees. So the mid 80s will likely be from around Philly to perhaps Newark. This record breaking 600 dm ridge really moderated the cool down which was expected to follow for late September.

IMG_7608.thumb.png.9c47cd7b78cb9b8621d1504ba09a31cb.png

 

New run

IMG_7604.thumb.png.c3afca47c1e7762ad0aae5cc84a74137.png

Old run

IMG_7605.thumb.png.f550c7eb07a157444da8c9f21b516b61.png

 

 

 

 

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28 minutes ago, bluewave said:

NYC isn’t considered one of the local warm spots these days due to the artificial cooling from the trees. So the mid 80s will likely be from around Philly to perhaps Newark. This record breaking 600 dm ridge really moderated the cool down which was expected to follow for late September.

IMG_7608.thumb.png.9c47cd7b78cb9b8621d1504ba09a31cb.png

 

New run

IMG_7604.thumb.png.c3afca47c1e7762ad0aae5cc84a74137.png

Old run

IMG_7605.thumb.png.f550c7eb07a157444da8c9f21b516b61.png

 

 

 

 

Looks like 70s all week

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1 hour ago, bluewave said:

The definition we use for endless summer in the fall is highs of 80° or warmer. This year got off an early start for 80s back in March. So many locations across the region are in the top 5 for 80° days this year.

The number Sep to Nov 80° days have more than tripled at the usual warm spots like Newark over their period of record. So now we just take a higher 80°+ days for granted in the fall.

2009 was the last time we had under 10 days reaching 80° during the fall at the locally warmer spots like Newark.

IMG_7602.thumb.jpeg.e220c698e111774e43bbb7bac79cbc8c.jpeg

 

When I was growing up in the 60s and 70s there were many September days in the 80s especially the first half of the month.Even some days in the 90s..Its still officially Summer.

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20 hours ago, MANDA said:

This ongoing and still strengthening El-Nino has allowed the 2026 tropical season (Pacific and Atlantic) to follow the Nino playbook to the letter and then some.  If the coming Fall and Winter follow the Nino playbook as well as the tropical season has it is going to be a rough season for many in this sub forum.  I'm taking an expect the worst and hope for the best approach.

I think above normal precipitation and above normal temperatures (DJF) are pretty much a lock.  We need to hope for a wet system to time itself with whatever cold air we can muster.  Maybe we get a "big one" that way?  Might be a big ask though.

Maybe a more Modoki El-Nino can better save the day but think that is also a big ask.

We'll see how we progress through Fall and go from there but keep expectations low.  I suspect most sensible winter weather lovers are bracing for the reality that this Winter might suck.

Looks like we’ll get an early sample of the super El Nino ridge north of the Great Lakes in late September. 
 

IMG_7609.thumb.png.92ba3d921e6e5767a09fa189a308b849.png



IMG_7610.png.31269267cdcb0f29386e223e6ab72349.png

 

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