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500mb Heights 1 to 28 February, 1991:
500mb heights depict a prevailing ridge over the western United States during the
month of February. The ridge intensifies mid-month and noticeably weakens by 28 February.
Data courtesy of NCEP
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500mb Heights 1 to 28 March, 1991:
In contrast to the previous month, the March 1991 500mb height field shows a repeated influx
of upper-air troughs coming onshore along the west coast of the United States.
Data courtesy of NCEP
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