Overview

• Monsoonal moisture will trigger storms after midday along the Sierra crest and eastern slope, with heavy rain, frequent lightning, small hail and gusty winds possible.
• Forecasters expect storm activity to ramp up through the afternoon and taper after sunset, with localized flooding remaining a concern.
• KCRA designates today a weather Impact Day for mountain hazards that could affect outdoor plans and travel from Lassen to Mono counties, including Lake Tahoe and Donner Summit.
• Valley and foothill areas should stay mostly dry and seasonably warm, with highs near 90 in the valley and upper 80s in the foothills.
• A slight chance of storms lingers Thursday mainly southeast of Tahoe, then a drier pattern returns Friday with a warmer weekend ahead.