Warm weather continues today and Friday. Cooler and windier this weekend through next week with a chance of showers on Saturday. Gusty winds, dry fuels and low humidity will facilitate fire starts and the potential for new or existing fires to spread rapidly.
Clear skies cover the interior of NorCal as the ridges sit overhead and the low cut remains well off SoCal. Offshore to flow continues to prevail and local north to east wind gusts of 15-30 mph are present again early this morning over the foothills and northern Sierra. Another day of unseasonably warm temperatures is expected with highs predicted to reach the mid-80s to mid-90s in the Central Valley.
A series of short waves passing north will further weaken the Crete Friday, bringing some modest cooling to the region, but it will still be unseasonably warm.
Highs will drop from about 10-15 degrees above average today to only about 5-10 degrees above Ordinary Friday.
Much bigger changes are expected this weekend as sets dig a fort hollow in the west bringing cooler and windier conditions with a chance of showers. NorCal will be at the rear of this fast moving system with showers mostly expected along the east side of the valley into the northern Sierra Saturday morning with persistent showers in the Sierra through Saturday evening.
QPF it is expected to be generally light with only a few hundredths of an inch in the valley and up to about half an inch through the higher elevations of the Northern Sierra.
Northeast surface pressure gradients increase again behind the system on Sunday, and the result will be windy to windy with widespread gusts of 25 to 35 mph possible in the valley and locally in the northern Sierra.
In-depth discussion (Monday to Thursday)
Sets show an eastern pacific Crete developing early next week with NorCal under dry northwest to flow. Weak disturbance moving southeast to northwest to flow could bring some mountain showers on Wednesday as well as cooler temperatures. Then weak ridges develop late next week.
Projected highs in the valley will be in the low to mid-70s throughout the period.