First Alert Weather: Heavy rain, snow, flooding hit Northern California; thunderstorms still on deck

Boreal has received nearly three feet of new snow since Saturday morning, the National Weather Service says.

Caltrans says Plumas County drivers should expect Highway 70 to be closed for an extended period of time from Jarbo Gap to Greenville Wye due to a big rockslide. 

No estimated time of reopening is known at this point. 

Isolated thunderstorms are still in store for the region on Monday. 

CBS13 Meteorologist Tracy Humphrey has the breakdown of what kind of weather is on deck: 

Southbound Highway 99 continues to be a problem spot for drivers Monday morning. 

Along with the flooding just north of Tuolumne Road, which is significant enough to be blocking the middle and slow lanes, California Highway Patrol says they're also now dealing with a big rig crash at Kansas Avenue. 

Officers are urging drivers to avoid southbound Highway 99.

Caltrans is warning drivers in the Modesto area that there is localized flooding going on along southbound Highway 99 near Tuolumne Road. 

Drivers are being urged to use a different freeway for now.

The National Weather Service has issued a Flood Advisory for Stockton and parts of Modesto until noon on Monday. 

Moderate to heavy rain is expected to persist through the morning, forecasts show. 

Localized urban flooding is possible. People are being urged to drive with extra caution and slow down. 

A big rig has jackknifed on southbound Interstate 5 in Sacramento as wet weather continues to impact traffic Monday morning. 

The crash happened just after 4:30 a.m. near the J Street offramp. 

Caltrans is warning that they may need to close I-5 for a short time to remove the wreck. 

Drivers all across the region should leave themselves a little extra time to get to where they're going Monday.

Chain controls went into effect on Interstate 80 in the Sierra late Sunday night. 

Eastbound travelers are required to have chains on all vehicles except 4-wheel-drive vehicles with snow tires on all four wheels from Cisco to the Donner Lake Interchange. 

Those same requirements apply to westbound travelers from the Donner Lake Interchange to Nyack. 

As of 11 p.m., no chain requirements were in effect on Highway 50.

Heavy rain is starting to fill in between Yuba City and Stockton.   

    

Here's a look at radar. You can see the steady-heavy rain starting to fill in from Yuba City down towards Stockton. Be careful on the roads tonight. #cawx @CBSSacramento pic.twitter.com/yt0G2yVt3z
— Ashley Nanfria (@ashleynanfria) January 22, 2024

  
 

Rain has hit the valley and will continue through the night into early Monday morning. There will be rounds of heavy rain over the next several hours and winds could gust up to 35 mph across the valley. 

The heaviest rain could happen around 9 or 10 p.m., the National Weather Service says.

    

Rain rates will be increasing starting now through Monday morning. We'll be see rounds of moderate to heavy rain over the next several hours. 
A wet and windy evening with gusts up to 35 MPH across the valley. #cawx @CBSSacramento pic.twitter.com/97OviZOoXa
— Ashley Nanfria (@ashleynanfria) January 22, 2024

  
 

A Flood Watch will go into effect Sunday night through Monday night.

    

A Flood Watch is in effect tonight through Monday night. 
We don't expect widespread flooding from this event, but flooding may occur in areas with poor drainage, especially on roads. #cawx @CBSSacramento pic.twitter.com/BHPk3TFEha
— Ashley Nanfria (@ashleynanfria) January 22, 2024

  
 

As a second storm is making its way to the valley and Sierra, the last 48 hours have brought rain and snow.

Here's the 48-hour snow report as of Sunday morning:

• Boreal: 16"
• Sugar Bowl: 13"
• Palisades Tahoe: 9"
• Northstar: 8"
• Dodge Ridge: 6"
• Sierra at Tahoe: 4"

Here's the 48-hour rain report as of Sunday morning:

• Auburn: 1.46"
• Sacramento: 1.03"
• Folsom: 1.02"
• Davis: 0.92"
• Modesto: 0.73"
• Stockton: 0.45"

    

The last 48 hours have been beneficial across the region! Here's a look at rain and snow reports thus far. 
We'll add more to reports tonight with our next wave moving in. 🌧️❄️ #cawx @CBSSacramento pic.twitter.com/7ZXSkiPB2R
— Ashley Nanfria (@ashleynanfria) January 21, 2024

  
 

On Interstate 80 in the Sierra Sunday afternoon, eastbound trucks must carry chains in order to continue past Applegate. For trucks heading west, chains are being screened five miles west of Reno. 

Chain controls were lifted on I-80 over Donner Summit at about 10 a.m. Sunday. 

As for Highway 50, there were no chain restrictions as of 2:45 p.m.

The UC Berkeley Central Sierra Snow Lab reported that it received nearly eight inches of snow in the last 24 hours, bringing the storm total to nearly 9 1/2 inches.

    

We've received 7.7" (19.5 cm) of #snow in the last 24 hours, which brings our storm total to 9.4" (24 cm). 
We are seeing light snow showers this morning and are expecting a break in the heavier snowfall rates until later this afternoon/evening.#CAwx #CAwater pic.twitter.com/NyqySIneN4
— UC Berkeley Central Sierra Snow Lab (@UCB_CSSL) January 21, 2024

  
 

The Sierra Avalanche Center said Saturday's storm did not meet expectations but that there was enough to make triggering avalanches more likely on Sunday. 

Avalanches are possible where weak snow sits below the surface or in places where wind-blown snow has piled up. 

Experts believe the next storm, moving in Sunday night, will create impacts and the avalanche danger could reach 'high.' They are concerned about large to very large avalanches over the next several days, leading to an Avalanche Watch being placed into effect.

Sunday's backcountry forecast:

• Below treeline: Considerable
• Near treeline: Considerable
• Above treeline: Considerable

Monday's backcountry forecast:

• Below treeline: High
• Near treeline: High
• Above treeline: High

The South Placer Fire District responded to a neighborhood in Granite Bay where firefighters had to divert water from entering homes.

Firefighters said no homes were damaged. 

Eastbound I-80 has been released at Castle Peak after multiple crashes and spin-outs. 

Chains are required on Highway 50 from Twin Bridges to Meyers in the Sierra. This is required for all vehicles except 4-wheel-drive vehicles with snow tires on all four wheels. 

Due to multiple crashes and spin-outs, the CHP Truckee said eastbound I-80 was being held at Castle Peak at about 7:45 p.m. There is no estimated time the eastbound side of the interstate will reopen. 

Chain controls went into effect on westbound Interstate 80 from the Donner Lake Interchange to Rainbow. Eastbound travelers will run into chain controls from Kingvale to the Donner Lake Interchange, the CHP said. 

The CHP added that trucks are at minimum restrictions. 

Around 3 p.m., CBS13 heard reports from Caltrans of roadway folding near Cal Expo at Highway 50 East and Howe Avenue off-ramp.

Caltrans is asking anyone who may be traveling in the mountains to delay their travel through the weekend due to the storms.

A thunderstorm developed over Rocklin, producing lightning, gusty winds and heavy rain around 3:30 p.m. About an hour later, thunderstorms developed near Turlock.

The heaviest rain was seen right up against the foothills where it is starting to change over into snow in the Sierra. 

    

A thunderstorm has developed north of Rocklin producing lightning, gusty winds and heavy rain. Isolated storms will be a possibility through the rest of tonight. #cawx @CBSSacramento pic.twitter.com/GtdIyb2vx7
— Ashley Nanfria (@ashleynanfria) January 20, 2024