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Cooldown expected this week, thunderstorms possible across all of Northern California

Thunderstorm development is likely every day this week in the Sierra and some of those storms may make their way into the valley in the coming days
Credit: Denis Rozhnovsky - stock.adobe.com
A lightning strike on the cloudy sky


A short-lived period of high pressure sent temperatures into the upper 90s over the weekend, but a low pressure system off the central coast will help to cool things off by the time Monday rolls around. 

High temperatures in the valley on Monday will be in the upper 80s to low 90s with more thunderstorms expected in the Sierra.

Not only will the low pressure system help to drop temperatures, but the counterclockwise rotation will pump abundant atmospheric moisture into the region. The moisture will aid in the formation of thunderstorms in the Sierra, a few of which may slide their way into the Sacramento Valley, although chances of that are low. If it does happen, storms will slide off the mountains from the east during the afternoon hours, with the highest chances of this happening on Tuesday.

The Storm Prediction Center puts much of the state in general risk of thunderstorm development. Even though this means that thunderstorm development is only around 10% in the valley, the threat of lightning and heavy rain will be present. 

Thunderstorm chances are greatest in the Sierra, foothills, and northern Sacramento Valley. Hazards associated with any thunderstorm development will be lightning, gusty winds, downpours and small hail. When thunder roars, go indoors.

In the valley, the moisture will aid in increasing cloud cover this week and the Delta breeze will return, in turn helping keep temperatures cool for June standards.

By Tuesday, temperatures will have dropped further, into the upper 70s and lower 80s for the valley and 50s and 60s across the Sierra. 

Mild temperatures, highs in the 70s and 80s, will remain through the rest of the week and extended forecast. The Climate Prediction Center's 6-10 and 8-14 day outlooks, released daily, show the next two weeks being cooler and wetter than average. 


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