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dendrite

Administrator / Meteorologist
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Posts posted by dendrite

  1. 2 minutes ago, Hoth said:

    Well, TauntonBlizz did say he's going to be in NH next weekend. We know he has an uncanny ability to draw jackpots to himself, though usually he needs to whinge a bit more first.

    Maybe Josh should setup on the Isles of Shoals

    • Haha 2
  2. 15 minutes ago, Damage In Tolland said:

    If that big cane the models have last week will f month is there it’ll pump heights and slow fronts which would lead to at least several days in a row of dews. Idalia and Franklin did it and now Lee. We’ll just have to see if it actually develops 

    Pump this :weenie:

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  3. 13 minutes ago, BrianW said:

    From  Wdrag in the NYC forum.

    The ECMWF weeklies had forecast temperatures to average above to much above normal across the region for the September 4-11 period. That forecast is verifying with the ongoing heatwave. September has increasingly become an extension of summer in parts of the Northeast. Since 2000, almost half of all years (48%) have had a monthly mean temperature of 70° or above in New York City. Prior to 2000, just 20% of Septembers had mean temperatures of 70° or above.

    The ENSO Region 1+2 anomaly was +3.2°C and the Region 3.4 anomaly was +1.6°C for the week centered around August 30. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +3.22°C and the ENSO Region 3.4 anomaly has averaged +1.32°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 -19.67 today.

    The preliminary Arctic Oscillation (AO) was +0.527 today.

    On September 7 the MJO was in Phase 3 at an amplitude of 2.665 (RMM). The September 6-djusted amplitude was 2.560 (RMM).

    Based on sensitivity analysis applied to the latest guidance, there is an implied 76% probability that New York City will have a warmer than normal September (1991-2020 normal). September will likely finish with a mean temperature near 71.6° (2.4° above normal).

    Melting all of that arctic sea ice and permafrost has an effect. It takes a lot of heat to fully melt snow and ice…we see it up here in the spring when we’re waiting to warm up. It doesn’t efficiently warm until you thaw and dry out. Now we see that line in the arctic expanding northward during the summers. The summer cP airmasses become warmer and it’s more difficult to drive them southward. Tippy’s Hadley cell expanding northward doesn’t help either. It just results in more of a lag in cool season climo.

    CON’s avg first freeze in the 51-80 normals was 9/22. In the current 91-20 normals it is 10/3.

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