Storm Tracker Forecast: Staying toasty with mountain thunderstorms ahead

The heat persists and the potential for mountain thunderstorms is ramping up across northern California for the rest of this week.

Posted: Jun 30, 2021 6:19 AM

Be prepared for the hot temperatures to continue and the threat of mountain thunderstorms returning to our region this week. Temperatures will stay very hot through our extended forecast, but are not expected to be quite as hot as we've been over the last week. The Excessive Heat Warning has now been removed for most of our region, but will continue in portions of Siskiyou and Modoc Counties through 11pm Thursday. A Heat Advisory will stay in effect in Lassen and Plumas Counties through 10pm Wednesday, and Trinity County & western Siskiyou County will be under a Heat Advisory through tonight as well. High pressure centered to our northeast is not as strong as it was early this week, but will be keeping our region hot and mostly dry. Low pressure off the coast of the Pacific Northwest will help to drive onshore flow, and bring modest relief from the heat as the Delta Breeze returns. We also have an area of low pressure to our south that will push some moisture into our far eastern zones over the next few days, and that will bring the threat of thunderstorms to the northern Sierra and southern Cascades each afternoon and evening through this weekend. We have clear conditions over most of northern California this morning, and the vast majority of us will exclusively have sunshine today. The exception is for portions of the Sierra & Cascades closest to the Oregon and Nevada borders, where some clouds and the threat of thunderstorms will be this afternoon and evening. Temperatures are starting out in the 60's to 70's in the valley and foothills, while mountain areas start out in the 50's to 60's this morning. Wind will mostly be out of the south to 15mph, with gusts up to around 20mph this afternoon and evening. Humidity will stay a littler higher today, with our lower values dropping into the 12 to 25 percent range this afternoon. High temperatures are projected to top out in the upper 90's to around 106 degrees in the valley, upper 80's to mid 90's in the foothills and Sierra, and 90's to lower triple digits in the Northern Mountains this afternoon. Fire danger will stay elevated as we have a hot and dry airmass over very dry fuels. The threat of mountain thunderstorms elevate fire danger further closer to the Nevada border.

The trend of hot and mostly dry conditions will persist through our extended forecast, and the threat of thunderstorms will become somewhat more widespread late this week and this weekend. Thunderstorms will be possible along the northern Sierra crest on Thursday, and then will shift further west into the eastern side of the valley from Friday through this weekend. Our temperatures will stay within a few degrees of today's through at least early next week. Make sure you're dressed for the heat, staying hydrated, and staying cautious with elevated fire danger persisting across northern California through our extended forecast.

Chico
Cloudy
46° wxIcon
Hi: 50° Lo: 43°
Feels Like: 46°
Oroville
Cloudy
47° wxIcon
Hi: 51° Lo: 43°
Feels Like: 47°
Paradise
Cloudy
46° wxIcon
Hi: 49° Lo: 43°
Feels Like: 46°
Chester
Partly Cloudy
47° wxIcon
Hi: 46° Lo: 21°
Feels Like: 47°
Red Bluff
Cloudy
47° wxIcon
Hi: 49° Lo: 37°
Feels Like: 45°
Willows
Cloudy
46° wxIcon
Hi: 50° Lo: 38°
Feels Like: 46°
The fog tucked us in last night, leaving for some surreal driving conditions on the roads. We see the potential for a repeat situation this evening for the valley.
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