Showers and thunderstorms moved from east to west over the Sierra toward the west slope foothills and the valley today. There have been a few lightning strikes and fire danger remains very high. Much hotter weather is ahead, too. An area of low pressure remained over California today as expected, and it brought the increased shower and thunderstorm activity to northern California. The active weather will come to an end after the sun goes down tonight, and we can expect a quiet beginning to Friday. Lows will range from the 40s in the mountains to the 60s in the valley. Friday will be mostly sunny and hotter with only isolated mountain thunderstorms. Highs will range from the 80s in the mountains to the lower 100s in the valley.
Friday will be a hot day, but it will get much hotter this weekend through most of next week as a strong ridge of high pressure builds over the West Coast, and its grip on our weather really won't loosen for quite a while. Excessive Heat Warnings will be in effect from Saturday afternoon through Wednesday night for most of northern California, with widespread highs ranging from 95 to 115 degrees. Most areas should remain at or below 110 degrees. Please prepare for this dangerously hot weather by completely most of your tasks during the morning, staying out of the sun, drinking plenty of water, seek air conditioning, check on seniors, children and pets, and be sure to wear sunscreen if you do have to go out in the sun this week.