This blog will be issued every Monday, Wednesday, and Saturday morning and updated if the weather is changing or critical or interesting weather events are occurring.
Cooler weather is on the way. Today the foothills and higher elevations will see temperatures about like yesterday. However, marine air is moving through the delta and up the valley. Most of the cooling from the marine air will be south of Red Bluff but Redding should be a couple of degrees cooler. Sunday we will see a few degrees more cooling. This morning's satellite picture shows a weak upper level low pressure area off the coast. This system will trigger afternoon and evening thunderstorms today over the Sierra from Tahoe southward. Sunday the low will lift northeastward and all of the higher elevations of Northern California will have a chance of isolated afternoon and evening thunderstorms.
Monday through Wednesday there will be a low pressure area over western Canada, which will keep the high pressure ridge suppressed (see map below). During this time the inland areas of the north state will be mostly sunny and temperatures will be near normal. There is a chance of isolated afternoon thunderstorms over Siskiyou, Modoc, and Lassen counties Monday.
Thursday through the weekend the high pressure ridge will push back northward. This will warm temperatures back to a few degrees above normal.
The Old Forecaster.