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500mb analyses for 14 to 23 November 2001:
An animation of 500mb heights illustrates the development of a ridge over western North America.
Data courtesy of NCEP
SLP and 1000-500mb thickness for 14 to 23 November 2001:
Surface maps show the transport of warm low-level air into Alaska and the Yukon, strengthening a ridge.
Data courtesy of NCEP
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