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October 2026


MJO812
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The AIFS ensembles are particularly warm for the first week of November. The regular ECMWF ensembles are still warm (highs in the 60s), but cooler than their AI counterparts. The extended range of the NBM is also closer to the regular ECMWF ensembles. Both sets of ECMWF ensembles have high spreads (uncertainty), especially after November 3. 

image.png.bbeffa2321fc5f2122d0b35209a93b3a.png

image.png.df09168a129ad5158c6d4ed55529ad71.png

However, the uncertainty concerns the magnitude of warmth, not whether it will be warmer than normal. The idea of a warmer than normal start to November has been a recurrent theme on the guidance. The most recent ECMWF weekly guidance is below.

image.png.3622af5e7b2ca85a732168ffa0250672.png

 

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