Some big changes will take place from the weather experienced today to the weather by the weekend and early next week up and down the West Coast.
In central and Southern California and the Southwest, the above-normal temperatures, and in some areas just plain old hot weather, of late will be going about a bit of a cooling process. By the weekend, temperatures will be near normal in the Desert Southwest but below normal for coastal and coastal valley areas. High temperatures by Saturday and Sunday in places like Los Angeles and San Diego will be 20-plus degrees lower than today. A return of morning low clouds is also likely in these areas. In the Central Valley, it won't be quite as dramatic but a good 10 to 15 degrees of cooling is likely.
In the Northwest, wetter, and in some areas whiter, weather is likely along with colder temperatures. A strong and cold upper-level trough will develop south of the Gulf of Alaska. This will eventually form a cold upper-level high off the Northwest coast early next week. This is likely to bring periods of rain west of the Cascades and some showers east along with a big drop-off in temperatures. Snow is likely to fall in the Cascades with snow levels dropping below pass level in Washington state by Sunday. Next week it's likely to get even chillier with even lower snow levels and additional showers or rain along with snow in the mountains.
Parts of Southern California are likely to have temperatures near 90 degrees again by Monday and Tuesday.
A prolonged rain-free pattern is setting in.
By this time in 1998 there was twice as much rain that had occurred to date compared to 2015-2016.
Could an unusual El Nino precipitation pattern be as simple as looking at the state of water temperatures?
One thing that I find interesting is that the pattern since fall has not been your typical El Nino storm pattern.
There are signs of a possible stormier pattern beginning the week of Jan. 18.