Final evening and this morning, a entrance moved by means of bringing rain and gusty winds. As proven by the water vapor imagery on Saturday (under(, this entrance was tapping into an enormous plume of water vapor stretching 1000’s of miles throughout the Pacific that has been current for weeks.
The important thing problem function driving our cool, cloudy climate has been the existence of the persistent space of low strain over the Gulf of Alaska (see the higher level–500 hPa/about 18,000 ft– map for in the present day at 5 AM under, the temperature on the stage is proven by shading, orange/pink is hotter).
With low strain over the Gulf of Alaska and better strain within the subtropics, the result’s a big change of strain, which ends up in a robust western jet stream. Which brings in moisture from the west. The ambiance is absolutely like an enormous Rube Goldberg machine!
Fortuitously, there will probably be a major break on Tuesday afternoon as a modest ridge of excessive strain builds over the area (see upper-level map under, with an arrow indicating the high-pressure ridge). You notice the tongue of heat air shifting northward over the West Coast.
Based on the Nationwide Climate Service’s prime forecasting support, the Nationwide Mix of Fashions, temperatures at SeaTac may surge to 71F on Tuesday…think about that! Earlier than falling again into the 60s.
The massive drawback is that our outdated pal, the Gulf of Alaska trough, will rebuild, resulting in an excellent wetter system on the finish of the week (the higher stage map at 5 AM subsequent Saturday is proven).
That is getting very outdated. The UW WRF mannequin’s 48-h complete rainfall ending 5 PM Saturday reveals heavy rain over the mountains (the orange to pink colours) and average rain elsewhere.
Controversial Word:
Much less Controversial Word:
I will probably be giving a chat and do a ebook signing on the Northgate Barnes and Noble in Seattle on Saturday, June twenty fifth at 1 PM.
