Dangerous heat continues today. Smoke from local wildfires continues to affect parts of the interior of Northern California. Thunderstorms are possible in the northern Sierra Nevada this weekend and early next week.
This will be the last day of record heat and dangerous fever inside. The mountains and foothills are getting cooler this morning, but it’s still a little warm in the valleys as of 3am.
Smoke from the mosquito wildfires has spread across the southern Sacramento Valley and could affect today’s high temperature forecast. Radar and satellite thermal images show the wildfires are still very active this morning.
Smoke is forecast to be pushed eastward this evening as winds from the delta pick up and improve air quality in the valleys and foothills south of Sacramento.
Isolated showers or thunderstorms are likely again today, mainly south of Alpine County.
Tonight we’ll see the return of Delta Breeze, which is moderate to strong in intensity, so expect a faster interior cooldown tonight.
Humidity from the current Hurricane Cay will roll over the area on Saturday, bringing temperatures down significantly this week, with highs expected in the mid-80s to mid-90s in the valley. This also means showers and thunderstorms are possible this weekend. At this time, thunderstorm activity appears to be limited to the Sierra Nevada Mountains and primarily south of Lake Tahoe, with forecasts expected daily through Monday. There is a possibility.
Mostly cloudy conditions will continue on Sunday, and a proper trough of low pressure off the coast will also help bring synoptic cooling to the region.
Extended Discussion (Tuesday to Friday)
A long-wave trough will be present off the west coast throughout the extended forecast period as a series of short waves move inland. Increased onshore currents and general cooling result in normal high temperatures in the 80’s in the Central Valley. A slight chance of afternoon showers and thunderstorms in the Sierra Nevada on Tuesday and Wednesday.