Northern California is waking up to a cooler morning under scattered clouds and showers in some areas. Meteorologist Tamara Berg says showers will be on-and-off for the morning commute, with some areas staying dry. Parts of Northern California could have thunderstorms in the afternoon. (Watch a livestream of our newscasts in the video below from 4 p.m. to 5:30 p.m. and again from 6 p.m. through 7:30 p.m.) Temperatures will remain cool into the afternoon, with highs Wednesday peaking in the low to mid-50s. Latest updates on storm impactsWednesday updates:4:52 p.m.: I-80 traffic has been released.4:30 p.m.: Westbound I-80 traffic is being held from Truckee to 2 miles east of Baxter because of an overturned vehicle, Caltrans says. 3:49 p.m.: 50 mph winds and pea-sized hail are possible in the Modesto and Turlock area through 4:30 p.m., the National Weather Service says. 2:33 p.m.: Here's a view of the flooding that's impacting the I-680 traffic in Fairfield. 1:17 p.m.: Chain controls have been lifted over Donner Summit. 12:56 p.m.: Fairfield police say to avoid Interstate 680 between Gold Hill Road and Marsh View Road because of flooding. 12:29 p.m.: San Joaquin County parks officials have closed Dos Reis Regional Park and Mossdale Crossing Regional Park over flooding concerns. Both are on the San Joaquin River. 12:16 p.m.: Some Sierra chain controls dropped on I-80. 12 p.m.: Here's a look at the latest snow totals. 11 a.m.: Sutter County says some roads are closed because of flooding. Learn more by clicking the link below. 6:20 a.m.: Grass Valley School District will have a late start on Wednesday to allow city plows and maintenance crews to clear walkways and roads.What to know about the forecast ON-AND-OFF SNOW IN THE SIERRASnowfall will also be on-and-off throughout the day, with levels around 2,000 feet. Sierra passes may see an additional 3 to 5 inches of snow. CHANCE FOR THUNDERSTORMS IN THE VALLEYAreas that get sun breaks in the afternoon could see some thunderstorms pop up that may produce heavy downpours and hail. “I just can't stress enough, if you work outside for a living, be on your guard on a day like today, looking for those dark clouds and take shelter if you do hear thunder and you see some lightning,” Berg said.Showers will linger in parts of Northern California up until around lunchtime and taper off after sunset. There’s a good chance of thunderstorms developing in the Sacramento area by about 6 p.m. | MORE | Here's what it takes to get a thunderstorm to developLOOKING AHEADThe mountains will see some showers Thursday afternoon, while the Valley will dry out. Thursday and Friday also look dry for the Valley.Download our app for the latestHere is where you can download our app for the latest weather alerts.Track interactive, Doppler radar(App users, click here to see our interactive radar.)Real-time traffic map(App users, click here to see our real-time traffic map.)Follow our KCRA weather team on social mediaChief meteorologist Mark Finan on Facebook and TwitterMeteorologist Tamara Berg on Facebook and TwitterMeteorologist Eileen Javora on FacebookMeteorologist Dirk Verdoorn on FacebookMeteorologist/climate reporter Heather Waldman on Facebook and TwitterWatch our forecasts on TV or onlineHere's where to find our latest video forecast. You can also watch a livestream of our latest newscast here. The banner on our website turns red when we're live.We're also streaming on the Very Local app for Roku, Apple TV or Amazon Fire TV.