Happy Friday to you! We're starting the morning out mostly clear and not too cold in the valley areas.
BUT, plan on a chance for scattered rain showers and thunderstorms mainly in the mountains and foothills today and Saturday as one low pressure system moves east and another drops in to take its place.
Heavy rain is possible, with more widespread showers or thunderstorms on Sunday and Sunday night with snow higher Sierra elevations.
Afternoon mountain showers continuing through mid week.
Low pressure is shifting mainly south and east so we'll start the day with dry conditions and fair skies most locations.
A low pressure system dropping southward into the Pacific Northwest this afternoon will bring instability and a threat of showers or thunderstorms this afternoon and evening.
Most of this activity will be over the mountains but some shower activity may slip into the valley areas.
We're talking about a tenth of an inch or so today and into tomorrow, but possible thunderstorms could bring heavier rainfall - by Sunday, some areas could see more than an inch total
Daytime highs today should come in similar to Thursday which is near or a little below normal for this time of year.
On Saturday the Pacific Northwest trough drops south, so the biggest chance of showers or thunderstorms will be over the eastern half of the forecast area.
Rain should be light but heavier showers are possible.
We'll see cooler air between storms bringing us to below normal temperatures.
A stronger low pressure system is forecast to drop southward down the Pacific Northwest coast and into northwest California on Sunday.
Showers and thunderstorms will again be likely but over the entire area this time.
This system will usher in still cooler air with daytime highs down to 10-15 degrees below normal.
Snow levels will likely drop to below pass levels with enough snowfall forecast over the Sierra passes to bring travel impacts right in the middle of the coming Memorial day weekend.
The upper low shifts eastward into the Great Basin on Monday.
This will shift the shower threat back eastward by Monday afternoon so main shower activity will be over the mountains.
By the afternoon, snow levels should be above pass levels with daytime highs climbing a bit although remaining below normal.
Unsettled pattern continues through the period as ensembles support troughing across the area.
Chances for showers or thunderstorms expected over higher terrain throughout the week, mainly in the afternoon and early evening hours.
Elsewhere, dry conditions are expected. Temperatures will be on the rise through the period with Valley highs in the upper 70s to low 80s Tuesday, reaching into the mid and upper 80s by late next week.
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