Parts of Northern California could experience record heat Monday afternoon, followed by thunderstorms just hours later.
A high-pressure system that centered itself over the Pacific Northwest on Sunday and brought 90-degree temperatures to parts of Washington and Oregon is predicted to shift eastward Monday, but not before another day of heat. The area of high pressure is too far away to prevent cool, cloudy skies in San Francisco, but the northern Sacramento Valley is on the outskirts of the blocking weather pattern. A heat advisory remains in effect until 11 p.m. Monday in Redding, Red Bluff (Tehama County) and Paradise (Butte County) for highs up to 108 degrees.
The city of Mount Shasta is forecast to reach 95 degrees, which would break a June 9 maximum temperature record that dates back to 1948.
High-pressure systems often result in clear skies beneath them, but that won’t be the case in Northern California’s mountains Monday. Precipitable water, a measure of atmospheric moisture, is predicted to be around 200% of normal across the Sierra Nevada and Southern Cascades, raising the chance of thunderstorms…