Update from Rick Thoman

Alaska “Blob” Tracker

The JISAO PDO index for May declined slightly from April, to +2.35. However, that’s still the highest value of record for May, edging out +2.32 in May 1940. The spring (Mar-May) mean value was +2.46 is by far the highest in the past 117 years (for the JISAO time series).

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