Pattern Change Overview
Jet Stream Pattern
The forecast jet stream pattern on Sunday.
The key to this pattern change is the rearrangement of the jet stream across North America. The jet stream is a ribbon of fast winds aloft in the upper atmosphere that helps dictate the weather conditions we see near the surface of the earth.
Right now, the jet stream is dipping south across the eastern half of the United States. This has brought a cooler, refreshing air mass to parts of the Midwest, East and even the Deep South. Through this weekend, the main ribbon of strong winds associated with the jet stream will build north into Canada, though there will be some lagging upper-level energy in the East south of the main jet stream. The end result is building warmth across the nation's midsection and points east.
At the same time, the jet stream will buckle southward along the West Coast in response to its northward shift in the East. This will bring much cooler air and the potential for some welcome rainfall to the Pacific Northwest.
The pattern change may also play a role in helping to steer the latest Atlantic named storm, Erika. However this will depend on Erika's future path and intensity. For more on that story, click here.
http://www.weather.com/forecast/national/news/pattern-change-late-august-early-september-northwest-midwest-east
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