El Niño effects in June 2023
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The strong, persistent upper-level trough feature over SE Canada, Great Lakes & the NE US during June 2023 is indeed consistent with El Niño, upper-level weather patterns. During a typical June, the polar jet typically is more zonal. But this year, perturbations in the mid-latitude atmospheric circulation in the northern West Hemisphere are a result in wind reversals taking shape. This process is creating nearly stationary, large amplitude oscillations in the jet stream.