The unusual deep, cold upper vortex drifting down over the Great Lakes bringing an abnormal chill from the Upper Midwest to Mid-Atlantic may not be a short lived blip but part of a pattern that lingers.

For the first time since last year, the NAO is tanking and that means a twin trough under Greenland block pattern.

The GFS ensemble shows an eastern North America/Western Europe trough holding into May.

TOP IMAGE CREDIT: WeatherBug

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CFSv2 weekly temp anomalies.

All this is likely in response to the ongoing strat warming over the pole in the last few weeks.

The persistent polar strat warming/abnormally warm water in Pacific from equator to Alaska is likely holding this upper pattern but combine that with El Nino fuelled rainfall that has the CFSv2 showing little in the way of real heat across much of the US this summer.

Check out the lack of dry and expanse of wetter than normal across the country seen by the CFSv2 from the June through August period.

The only area I have concern over is California.

Be sure to watch today’s video for the discussion.

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