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in terms of what we might be able to expect going forward, the Pacific jet is obviously of great importance. it seems like we're going to see a rather potent jet, though one that's still closer to Japan. it also remains equatorward, which is important

ecmwf-ensemble-avg-globe-uv200_stream-2795200.png.fb2a048518697f6928212ad1bbaa0a1a.png

when looking at more favorable winters like 2010, 2013, and 2020, there is a solid signal for a more potent jet (2/3 years are equatorward), and most importantly, there is ample wave breaking out ahead of the jet streak. this is for around a 10 day period from the end of Nov into the first week of Dec

1470467292_goodpacjets.gif.364a84445f6d42b6c6056db2b9907a3a.gif

when looking at the less favorable years like 1998, 1999, 2001, and 2007, the jet extends much too far, is more poleward, and there is much less wave breaking as a result

821679705_badpacjets.gif.b99f4440d572d570c8439af0834cebcf.gif

therefore, it's important to see how the jet behaves over the next 10 days or so. the more equatorward presentation of the jet is partly why we're seeing troughing set up so much near HI in the medium to long range... if it was poleward, those troughs would be pushing into the ridge or even allowing those troughs to move closer to the GoAK

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Decided to have some fun with data and correlated NYC snowfalls in December with temperatures around the world for the last 44 years. The first map only has statistically significant correlations and the second shows all. I guess a cold Plains and Midwest corresponds with higher snowfall around here. I probably didn't need to run the numbers to figure that out but here it is anyway. I was surprised by the western Canada correlation...

DecSnowTempSig.png

DecSnowTemp.png

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It will turn somewhat cooler tomorrow with temperatures topping out mainly in the middle 50s. The dry weather will continue through the middle of the week. Rain is likely Wednesday night and Thursday. A storm total of 0.50"-1.00" is likely with some locally higher amounts of 1.50". That rain will likely be followed by a period of below normal but not exceptionally cold temperatures.

With the remainder of November potentially becoming mainly dry following the rainstorm, parts of the region could challenge records for their driest fall and driest season on record. Select records are below:

New York City: Driest fall: 4.00", Fall 1908; Driest season: 3.92", Summer 1999
Newark: Driest fall: 4.21", Fall 1931; Driest season: 4.21", Fall 1931
Philadelphia: Driest fall: 2.37", Fall, 1922; Driest season: 2.37", Fall 1922
Wilmington, DE: Driest fall: 3.17", Fall 1922; Driest season: 3.17", Fall 1922

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 to much warmer than normal outcome is favored by the November run of the ECMWF for Winter 2024-2025.

The ENSO Region 1+2 anomaly was +0.2°C and the Region 3.4 anomaly was 0.0°C for the week centered around November 13. 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 -0.30°C. Neutral ENSO conditions may evolve into a La Niña event during the late fall. Uncertainty as to whether a La Niña will develop has increased.

The SOI was +9.29 today.

The preliminary Arctic Oscillation (AO) was +0.012 today.

Based on sensitivity analysis applied to the latest guidance, there is an implied 96% probability that New York City will have a warmer than normal November (1991-2020 normal). November will likely finish with a mean temperature near 51.4° (3.4° above normal).

 

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We've got a Walt D. I-84 special modeled for Thurs - Sat morning but no Walt thread, which is unfortunate.

Most modeling now has first snowflakes of the winter for a lot of areas sometime during this period. Could also be a significant elevation snowstorm for at least a narrow area.

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Great to see the models coming in wetter. This will be one of the strongest upper lows in the East this time of year. Hopefully, the is the first step toward a much wetter pattern as we head into December. 
 

IMG_1950.png.109ed7ab60c1d3743d15300dbcbc5a62.png

 

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