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

Figure 11. Sea-level pressure and 925 hPa temperatures (°C, color) at 1200 UTC 14 December (a), 0000 UTC (b), 0300 UTC (c), 0600 UTC (d), and 0900 UTC 15 December 2006. Isobar contour interval is 1 hPa. (a) and (b) from the 36-km domain; the remainder, 12-km domain.