Update: Sunday morning. Front is moving in faster than models predicted....about 3-4 hr faster. Rain will be in Puget Sound by 7-8 AM. Mountains an hour later.
Fall officially begins at 1:44 PM PDT on Sunday, September 22, 2013
Our first major storm of the fall will hit almost exactly at the same time.
After a weak front went through tonight (Friday), we will have a break (but with some showers and clouds) on Saturday. But Sunday will truly feel like fall as a strong front, with lots of rain and some wind, moves through the region. According to the UW WRF model, a strong front will be right off the coast at 11 AM (18 UTC) Sunday morning, with strong southerlies along the coast and a BIG wind shift to westerlies behind it (see map). A fairly strong low pressure center is moving into the Gulf of Alaska with this front, producing a decent pressure gradient along the coast and in the Strait of Georgia.
You like a nice blow? Fairly strong winds (sustained to 35 kt) will precede the front on the coast and equally strong flow will strike the NW marine area, particularly around the San Juans and norther Whidbey Island. These NW interior strong winds result from the large north-south pressure difference with the front and the effects of the Olympics and mountains on Vancouver Island.