The only story in the West of big importance weather-wise is the impending chance of rain next week over much of California. An early season closed low will bring the chance of some rain for much of central and Southern California for at least several days next week along with temperatures well-below normal.
The ideas remain the same from my two previous posts. I am not going to rehash what I have been saying. I do want to give you a visual look at each day Monday through Thursday next week to show you the stability of the REX block. Because we cannot redistribute the European model data in graphical form, and the fact that there really is no important large-scale differences between it and the GFS, I give you the 500 mb graphics from the 12Z run of the GFS for each day.
As with any closed low where precipitation occurs, it is very hard to forecast even a day or two out. It is obvious that there is a good chance for scattered showers, and even a thundershower, somewhere around this closed low each day. It is also likely in this pattern that temperatures will stay well below normal for some time to come.
With such high amounts of water vapor, thunderstorms will bring locally very heavy rain that can cause flash flooding.
Many areas east of the Cascades this weekend will be over 100 F.
some of the moisture from Andres and newly formed Blanca could influence the weather in the Southwest
A powerful second punch is offshore right now and comes inland during the early morning hours. It will bring moderate to heavy rain for the Friday morning rush.
The main storm will move in off the Pacific Thursday and Friday.
Last year by the end of April the drought in California was very bad. Since then it has become even worse.