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Online 14.1: Pacific Storm Builds a Ridge
over Western North America
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300 mb:
Changes in the flow pattern at 300 mb show migration of troughs and ridges as they build and move across the United States. A strong ridge over the western United States in winter leads to bitter cold surface temperatures in the central and eastern United States.
Data courtesy of NCEP
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850 mb:
Animations of 850 mb conditions show the severity of the cold wave in late January / early February 2007.
Data courtesy of NCEP
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Sea Level Pressure:
Persistent low pressure in the eastern half of the U.S. brings cold air advection to the middle of the country. The cold advection reinforces the cold air associated with the broad high pressure in the west and midwest during the latter half of the period.
Data courtesy of NCEP
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