Following a wet past few days with upper low crossing Sothern California into Four Corners then back SW into the Pacific, a major ridge has build over top bringing widespread 90s and 100s. 90s are reaching Montana, 70s, possibly 80s into Sask.

Camarillo Airport, Calif has witnessed an all-time high in the last hour of 106, surpassing the 103 high set back in 1978.

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However, when glancing at the 50hpa level temp within the stratosphere, I’m noticing that its warmer across the pole than it is in the mid and lower latitudes. No coincidence that when looking at the 500mb height anomalies now through the next 10-15 days, we see a build-up of pressure into Alaska, Greenland and Arctic while they lower underneath. This is a sure sign that a potentially major Oct cold shot is heading for the Eastern side of North America. Starting next week.

The all important Siberian snow pack in showing sure signs of growth.

Current 50hpa temps over the N hemisphere.

7 days from now and note the cooling into the lower latitudes while it holds the same in the arctic.

CFSv2 5-day mean 500mb height anomalies show the flip from negative to positive heights across the north with clear linking between Alaska and Greenland.

This supports a colder eastern pattern.

See video for the discussion.

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