Major Extratropical Cyclones of the Northwest United States: Historical Review, Climatology, and Synoptic Environment



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Figure 7. Sea level pressure composites for major wind events in region 2 (defined in Figure 5) for 48 h, 24h, and 0 h before the time of strongest winds. The left column presents the composite pressures (hPa) and the standard deviations (hPa) among the storms in color shades. The middle column displays the climatological sea level pressure distribution and the deviations of the composite windstorm pressure from climatology. The right hand panel shows the regions where the deviations from climatology are significant at the 95% and 99% levels.

Figure 8. 500 hPa geopotential height composites for major wind events in region 2 for 48 h, 24h, and 0 h before the time of strongest winds. The left column presents the composite heights (m) and the standard deviations (m) among the storms in color. The middle column displays the climatological 500 hPa height distribution and the deviations of the composite windstorm heights from climatology. The right hand panel shows the regions where the deviations are significant at the 95% and 99% levels.

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