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October 2023


wdrag
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A warm October is concluding with chilly readings. In New York City,Ocrober had a mean temperature of 60.5°. That was 2.6° warmer than normal.

Overnight, an offshore storm will bring some showers and periods of light rain to the region.

November will begin on a cold note. Areas outside of New York City and Philadelphia will see widespread freezes tomorrow night. The chill will moderate by the weekend, but temperatures could average below normal through the first 10-14 days of November.

October is solidly on track to finish as a warmer than normal month. Since 1950, only a single El Niño event with a monthly ENSO R3.4 anomaly of +1.00°C or above was warmer than normal in New York City during October: 2015 (sample size: 6). If one lowers the ENSO R3.4 anomaly to +0.75°C or above, only two 2/12 (17%) of El Niño cases saw a warmer than normal October in New York City: 1963 and 2015. Both years saw warm Octobers followed by warm Novembers.  

The ENSO Region 1+2 anomaly was +2.6°C and the Region 3.4 anomaly was +1.6°C for the week centered around October 25. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +2.47°C and the ENSO Region 3.4 anomaly has averaged +1.57°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. That transition is currently underway.

The SOI was +7.67 today.

The preliminary Arctic Oscillation (AO) was -0.531 today.

On October 28 the MJO was in Phase 8 at an amplitude of 1.083 (RMM). The October 27-adjusted amplitude was 1.326 (RMM).

 

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2 minutes ago, wdrag said:

Added ACIS Oct summary of above/below temp (degrees F) and departure from normal precip (inches). 

Screen Shot 2023-11-01 at 7.38.42 PM.png

Screen Shot 2023-11-01 at 7.40.17 PM.png

You be the judge,  In our NYC subforum, temps worked out, but precip not.  Nationally,  your call... Looks to me like a mixed bag of results. 

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