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Plane landing at Boeing Field, Seattle yesterday. http://seattletimes.nwsource.com/html/photogalleries/localnews2009554657/8.html
The heat is on for the Pacific Northwest as the upside down pattern continues. As New York City lost out in it’s chance at making 90 for just one day this month, Seattle warms to 97 and Portland strikes a broiling 106. It’s very upside down, the Pacific Northwest is feeling unusual heat whilst the Midwest feels unusual cold. Drive a cold air mass down, you drive a hot air mass up! The updown extremes counter balance one another. The type of pattern is allowing for some of the most unusual July conditions where 100s could ride straight into the urban Seattle-Portland corridor today and pull 90s all the way to the Arctic Circle and this is driven by the eastern cold. The entire US/Canada atmosphere is being squeezed, the Bermuda ridge is pushing into the trough over the middle of the continent, putting pressure on and driving colder air south faster, this pushes on the west coast ridge forcing the high to push and stretch to unusually far north latitudes. This sqeeze, push pull scenario is why Seattle and Portland is seeing some of it’s hottest air in years if not in recorded history blanket the region, compressional warming is a major factor, helped by the upper air pattern and the Cascades. Whilst I watch records fall with heat in the PNW, I watch the Midwest shiver in record cold.
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