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2 hours ago, lee59 said:

As I mentioned yesterday, Suffolk has a freeze warning and nothing in Nassau. This seems to happen every year with the first freeze or frost. We will probably have a freeze tonight in parts of Nassau

 

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Probably because Nassau has northern and southern zones, not eastern and western. Eastern Nassau will freeze but western will not. But the zones don’t really allow for that distinction 

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Areas outside of New York City and Philadelphia will see widespread freezes tonight. 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 +0.38 today.

The preliminary Arctic Oscillation (AO) was -0.802 today.

On October 29 the MJO was in Phase 8 at an amplitude of 0.997 (RMM). The October 28-adjusted amplitude was 1.083 (RMM).

 

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