Thursday's high and low were virtually identical to the average for that day (see graphic), something that has not happened virtually the entire (very warm) fall. Biking home last night, I felt the unaccustomed chill, sort of like a Hawaiian visiting the U.S. during winter.
Unfortunately, the persistent heat of the past weeks has greatly affected our snowpack. The following chart shows the percentage of normal snowpack as of Friday. Most of the region has less than 50% of normal (red color), with large portions of Oregon less than 20%. The Olympics are at 10% Only the north Cascades are near normal.
Over the next few days, a deep trough of low pressure over the eastern Pacific will bring strong flow as far south as California (see map for10 AM Saturday)
As a result, California will be unusually wet, although the Northwest will not escape the moisture (see 72 h total precipitation).