Summary - The basic pattern consists of the westerlies becoming more active, from October 11th onward through the 19th, and a series of fronts affects northern and northcentral California and the Pacific Northwest. The overall pattern continues somewhat changeable as normally occurs in the transitional seasons of spring and fall. Support continues for a longwave trough in the northern Pacific (160-170W), and some downstream troughing either near the Oregon coast or inland over the northern part of the Great Basin. This is wet for the Pacific Northwest, and northwest California, but dry in central and southern California. After the storm series on October 13th-18th, there is a dry and warm (or hot) period with Santa Anas in southern California and offshore flow on the 20th -22nd with highs in the mid-90s in southern California and upper 80s to near 90 in the foothills and interior valleys of northern California (Ukiah, Lake Co, upper Napa Valley).