SAN DIEGO — A slow-moving storm system arrived in San Diego County Monday night, with the heaviest of rain expected Tuesday, according to NWS. 

The system moving in from the southwest will bring a chance of rain throughout the county until Friday afternoon, with the most widespread rainfall expected on Tuesday and Wednesday, forecasters said.

Rainfall totals through Friday are expected to reach 2 inches in coastal and inland valley areas, while up to 3.5 inches are expected in the mountains and around 1 inch is expected in the deserts.

Families in the Southbay packed sandbags at the Bonita-Sunnyside Fire Station on Monday where Estella Castillo says heavy rains flood areas around her house, "The yard and sometimes it goes underneath the house so we have to have a pump."

Snow levels won't drop below 7,000 feet for the duration of the storm, meaning no snow is expected in the county.

Light rain could fall this afternoon throughout the county, but the first significant showers aren't expected until early Tuesday morning, according to the NWS.

There will also be a chance of thunderstorms in the inland valleys and the mountains on Tuesday and Thursday, while coastal areas will have a chance of thunderstorms on Tuesday and the mountains will have a chance on Thursday.

The Tijuana River Valley is prone to flooding. Street signs warning drivers are up. Equestrian ranches and horse owners at Driftwood Ranch are prepared

"They will prep their stalls with shavings or extra sand or dirt things of that nature," said Paul Hengst. 

He owns Driftwood and says a berm has helped keep the 10-acre ranch from flooding but knows others could need some help.

"Do our best to stay prepared and make sure that we keep an eye on everything. Everyone always look out for each other," said Hengst. 

High temperatures could reach 71 degrees near the coast, 70 in the western valleys, 68 near the foothills, 63 in the mountains and 74 in the deserts.

The system will move east out of the region by Friday night, but another storm system could bring a slight chance of rain on Sunday, forecasters said. 

An expectant mother who lives in Nestor wrote News 8, worried about the next storm. She and her husband live at Country Aire Apartments where it flooded on Thanksgiving. She says the manager has tried to contact the city to get them to clear the creek and it has not been cleared. During Thanksgiving the creek that runs near Hollister Street and Grove Avenue flooded several units causing major damage. 

RELATED: South Bay apartment complex floods as storm moves across San Diego

The Rains are Coming, Get Free Sandbags to Protect Your Home

The County of San Diego and CAL FIRE are providing free sand and bags to residents in unincorporated areas at numerous fire stations around the county.

People should call ahead to double-check availability and remember to bring a shovel to fill the bags. Some stations may have a limited supply. 

Sand and Bags

  • Bonita/Sunnyside: 4900 Bonita Road, Bonita, CA 91902 P: 619-479-2346
  • Boulevard: 40080 Ribbonwood Road, Boulevard, CA 91905 P: 619-390-2020
  • De Luz: 39431 De Luz Road, Fallbrook, CA 92028 P: 760-728-2422
  • Dulzura: 17304 Highway 94, Dulzura, CA 91917 P: 619-468-3391
  • Fallbrook: 4375 Pala Mesa Drive, Fallbrook, CA 92028 P: 760-723-2024
  • Julian: 3407 Highway 79, Julian, CA 92036 P:760-765-1510
  • Lakeside River Park Conservancy:12108 Industry Road, Lakeside CA 92040 P: 619-443-4770 *(Closed over the weekend; open Monday-Friday from 8:30 a.m. to 4 p.m.)
  • Palomar Mountain: 21610 Crestline Road, Palomar Mtn., CA 92060 P: 760-742-3701
  • Ramona: 3410 Dye Road, Ramona, CA 92065 P: 760-789-0107
  • Ramona: 24462 San Vicente Road, Ramona, CA 92065 P: 760-789-9465
  • Rincon: 16971 Highway 76, Pauma Valley, CA 92061 P: 760-742-3243
  • Valley Center: 28205 N. Lake Wohlford Road, Valley Center, CA 92082 P: 760-751-7605
  • Warner Springs: 35227 Highway 79, Warner Springs, CA 92086
    P: 760-782-9113

 Bags Only

  • Alpine: 1364 Tavern Road, Alpine, CA 91901 P: 619-445-2635
  • Deer Springs: 1321 Deer Springs Road, San Marcos, CA 92069 P: 760-741-5512
  • Campo: 31577 Highway 94, Campo, CA 91906 P: 619-478-5516
  • Campo (Lake Morena): 29690 Oak Drive, Campo, CA 91906 P: 619-478-5960
  • Deer Springs: 8709 Circle R Drive, Escondido, CA 92026 P: 760-749-8001
  • El Cajon: 551 Harbison Canyon Rd, El Cajon, CA 92019 P: 619-445-5001
  • Jacumba: 1255 Jacumba St., Jacumba, CA 91934 P: 619-766-4535
  • Jamul (Deerhorn): 2383 Honeysprings Road, Jamul, CA 91935 P: 619-468-3030
  • Mt. Laguna: 10385 Sunrise Highway, Mt. Laguna, CA 91948 P:619-473-8281
  • Ocotillo Wells: 5841 Highway 78, Borrego Springs, CA 92004 P: 760-767-7430
  • Potrero: 25130 Highway 94, Potrero, CA 91963 P: 619-478-5544
  • Ramona: (Intermountain) 25858 A Highway 78, Ramona, CA 92065 P: 760-789-3710
  • Ranchita: 37370 Montezuma Valley Road, Ranchita, CA 92066 P: 760-782-3467 *(Not staffed 24/7)
  • San Pasqual: 17701 San Pasqual Valley Rd, Escondido, CA 92025 P: 858-573-1322

ReadySanDiego.org’s Flooding webpage has more information about how to protect yourself and your property.

You may also want to check out this how-to video, “You’ve Got Your Sandbags, Now What?” that explains how to properly fill and use sandbags to protect your property.