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September 2023


Stormlover74
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1 hour ago, jm1220 said:

Could finally be one where east of the city is favored for the heavy rain. 

Yeah that's looking like a possibility. The 18z RGEM just has some light rain for us monday morning. The heavier rain for the afternoon with the coastal misses well to the east (central and eastern LI). Of course some other models get the heavy rain further to the west, so it's too early to call this one. Obviously we'll get a much better idea tomorrow. 

But no matter what happens with this monday, the weather for the rest of the week is going to be spectacular. Sunny with high temps mid to upper 70s and very low humidity. Probably the best stretch of weather for the year coming up. 

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11 hours ago, bluewave said:

Pretty cool how the early season nor’easter now forecast for Monday was missed by earlier model runs. So wet and cool pattern to start the new week. We’ll take anything that resembles an actual fall pattern. Eastern sections should be favored. So if this was the winter, better snows east with western areas missing out.

New run now has our first nor’easter of fall on Monday


F1FE913A-3CF0-4F0A-898E-4ADE5841C154.thumb.png.872900b62bd26d14319f520903604964.png

 

Old run just a frontal passage 


7A152F93-7A41-4411-A15D-B136F233602F.thumb.png.003a7ccebc72ad71af628b790ddaf986.png

image.thumb.png.17ad14b34e948da8f430a614091d4ab1.png

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1 hour ago, winterwx21 said:

Yeah that's looking like a possibility. The 18z RGEM just has some light rain for us monday morning. The heavier rain for the afternoon with the coastal misses well to the east (central and eastern LI). Of course some other models get the heavy rain further to the west, so it's too early to call this one. Obviously we'll get a much better idea tomorrow. 

But no matter what happens with this monday, the weather for the rest of the week is going to be spectacular. Sunny with high temps mid to upper 70s and very low humidity. Probably the best stretch of weather for the year coming up. 

Yup, of course 18z models look to be trending well out to sea with any significant rain. Guess we’ll see what happens. 

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13 minutes ago, nycwinter said:

why is weather forecasting so bad a few days ago we were looking a week to 10 days without any rain now that has changed quickly.,

Forecast reliability declines very rapidly going out beyond a couple of days. No one has a high skill forecast for even a working week, afaik.

That is what makes the effort so worthwhile, it's a really hard problem.

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Tomorrow will be fair and pleasant. However, rain will arrive on Monday and continue into Tuesday. A general 0.50"-1.50" of rain is likely.

In the medium and longer range, a warmer than normal pattern could develop in eastern North America.

The ENSO Region 1+2 anomaly was +2.9°C and the Region 3.4 anomaly was +1.6°C for the week centered around September 6. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +3.20°C and the ENSO Region 3.4 anomaly has averaged +1.38°C. El Niño conditions will likely continue to strengthen into the fall with the current East-based event transitioning to a basinwide El Niño for the upcoming winter.

The SOI was -13.19 today.

The preliminary Arctic Oscillation (AO) was -0.786 today.

On September 13 the MJO was in Phase 4 at an amplitude of 1.663 (RMM). The September 12-adjusted amplitude was 1.721 (RMM).

Based on sensitivity analysis applied to the latest guidance, there is an implied 81% probability that New York City will have a warmer than normal September (1991-2020 normal). September will likely finish with a mean temperature near 71.5° (2.3° above normal).

 

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3 hours ago, jm1220 said:

Yup, of course 18z models look to be trending well out to sea with any significant rain. Guess we’ll see what happens. 

So far the 0z models not impressed. RGEM, HRRR and both NAMs giving just a light to moderate amount of rain. Those Euro runs were probably overdoing it by a lot. Right now I'd say this is looking like a quarter to half inch of rain for most. 

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21 minutes ago, winterwx21 said:

So far the 0z models not impressed. RGEM, HRRR and both NAMs giving just a light to moderate amount of rain. Those Euro runs were probably overdoing it by a lot. Right now I'd say this is looking like a quarter to half inch of rain for most. 

NAM would split screw most of us with an initial round for the NW areas then the coastal low well out to sea. 

Other models have this split screw as well. 

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4 hours ago, nycwinter said:

why is weather forecasting so bad a few days ago we were looking a week to 10 days without any rain now that has changed quickly.,

The pattern is transitioning into fall. And yes in a very short time-frame we've gone from tracking Lee to tracking the arrival of an autumn air mass into the Great Lakes. The models are struggling. A few days ago the models were depicting a warm to very warm finish to September and start to October. It does not appear that way now. It could change again but I wouldn't bet on it. The endless summer is going to end.

WX/PT

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6 hours ago, forkyfork said:

https://twitter.com/ECMWFbot

if you go through the runs it had the right idea most of the time except for a west shift that lasted about two days. if the whole setup were shifted west that could have meant an atlantic city landfall panic before turning back into a suffolk landfall

The GFS easterly bias helped it win the Lee 5 day forecast challenge.

 

 

 

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The next 8 days are averaging  69degs.(62/77) or +1.

Reached 79 here yesterday at 6pm.

Today:   73-78, wind w., increasing clouds, Rain by 9pm, 65 tomorrow AM.

61*(70%RH) here at 7am.    66* at 9am.      69* at Noon.      73* at 3pm.    Reached 74* at 4pm.      70* at 8pm.

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6 hours ago, Wxoutlooksblog said:

The pattern is transitioning into fall. And yes in a very short time-frame we've gone from tracking Lee to tracking the arrival of an autumn air mass into the Great Lakes. The models are struggling. A few days ago the models were depicting a warm to very warm finish to September and start to October. It does not appear that way now. It could change again but I wouldn't bet on it. The endless summer is going to end.

WX/PT

Looks like the warmer minimums for late September will drive the departures with plenty of onshore flow and high pressure to the north. Could get interesting for heavy rainfall if we get some close in tropical development . Highs may get muted if we get a lot of onshore flow, clouds, and moisture.
 

New run stronger blocking high SE Canada

04E6D8B5-92C1-4454-B01F-13FFEE9D3BBA.thumb.png.b85e4ebc7fa89386e7f9e9947c2b89d9.png
 

Old run

 

72ED3F67-DC9E-4823-9BF6-6F1D56B13DB6.thumb.png.a7aa239355ef4451534b2314bc8f0ef5.png

 

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1 hour ago, lee59 said:

Dipped to 49 here this morning. UHI in full affect as Central Park currently 60. Good radiational cooling night.

LGA still remains the undefeated UHI capitol. I also think the ASOS right on the warmer Sound/East River helps. The marshy areas around the EWR and JFK sensors helped them radiate better than LGA and NYC. 
 

Lows around NYC

NYC…59

LGA….62

JFK….56

EWR…56

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