Wednesday, October 20, 2010
Wet and Windy Conditions by the Weekend
The upper ridge which has given the Pacific northwest sunny and warm Fall weather will shift east Thursday and Thursday night. This will allow an increasingly strong westerly jet stream to impact the northwest over the weekend.
The first storm is expected to impact the coast Thursday night and Friday with a glancing blow to northwest Oregon. Rain and wind will be mostly along the north coast.
A second storm system is anticipated around Saturday morning. This system will bring increasing rain ahead of a warm front as a weakening surface low sweeps in from the southwest.
Computer models show a strong low pressure system developing in the Gulf of Alaska on Saturday... fueled by moisture of tropical origin. A very strong westerly jet stream associated with this low is currently expe cted to push a strong frontal system into western Oregon and southwest Washington Saturday night. There is a potential for heavy rain and strong winds with this system... especially along the Oregon and Washington coast.
Snow levels will remain above pass levels through Saturday with snow falling on the higher Cascade peaks. The snow level should lower Sunday and Monday with significant snow expected in the Cascades down to near pass levels.
People planning outdoor activities... especially in the mountains and along the coast should be ready for deteriorating weather conditions... heavy rain... strong gusty winds... cooler weather and snow at the higher elevations. These conditions are expected to last into next week.