June 8, 2018 – Dry and warm today. Cooler temperatures and the chance for showers and isolated thunder north of Redding on Saturday. Dry weather for Sunday into mid-week with substantial warming trend.
Discussion
Temperatures will warm several degrees today with zonal flow across the area. Trough then moves east across California on Saturday, bringing onshore flow, cooler temperatures, and the chance for a few showers and thunderstorms north of Redding.
System isn’t bringing substantial moisture with it so not expecting widespread activity. Accompanying the system will be breezy winds.
In the wake of the trough, ridging begins to build in for Sunday into next week. Flow turns more northerly with breezy conditions again on Sunday across the valley. Temperatures will warm substantially with valley highs back into the 90s by Monday.
Extended discussion (Tuesday through Friday)
Extended forecast starts out very warm under building upper ridge over the west coast. Daytime highs Tuesday are forecast to run from 10 to 15 degrees above normal with near 100 degree readings throughout the central valley. Upper ridge shifts east on Wednesday as a Pacific trough moves into the northeast Pacific. Most locations will see a slight cool off but highs will remain well above normal.
The upper low is forecast to push into the Pacific Northwest on Thursday. At this time, it looks like any precipitation associated with this system will stay north of the forecast area. Breezy onshore flow and airmass cooling should however bring daytime highs Thursday down close to normal for this time of year.
Forecast remains dry for next Friday but daytime highs will remain near or below normal as upper low remains over the Pacific Northwest.