ENSO Impact on Winter Precipitation in the Southeast United States through a Synoptic Climate Approach

The ENSO impact on winter precipitation in the Southeast United States was analyzed from perspective of daily weather types (WTs). We calculated dynamic contribution associated with change frequency WTs and thermodynamic due to changes spatial patterns environmental fields WTs. Six were obtained using a k-means clustering analysis 850 hPa winds reanalysis data November February 1948–2022. All can only persist for few days. most frequent type is WT1 (shallow trough Eastern U.S.), which or likely transfer WT4 (Mississippi River Valley ridge). becomes less El Niño years, while does not much. 2–6 correspond loop eastward propagating waves troughs ridges mid-latitude westerlies. Three deep U.S., are WT2 (east coast trough), WT3 (off east trough) WT6 (plains become more years. (WTs 2, 3 6) shallow (WT1) result above-normal coastal U.S. WT5 Carolina High), maximum extending Mississippi Great Lakes, corresponds below-normal Lakes Upper Ohio vice versa La Niña relative location dependent. On coast, two contributions similar magnitude.