SAN DIEGO - The National Weather Service (NWS) has issued a Flash Flood Warning for portions of North County in Southern California as an ongoing atmospheric river continues to bring heavy rainfall. The warning, which includes communities stretching from San Diego to Orange counties, was issued due to the anticipated rainfall rate reaching 0.75 to one inch per hour, with an additional one to two inches of rain possible.

The Flash Flood Warning, effective until 1 p.m. Tuesday, raises concerns of "life-threatening" flooding, particularly in areas near streams, creeks, and waterways. Low-lying urban regions, highways, streets, and underpasses are also at risk of flooding. A map outlining the affected areas can be found below.

While the warning remains in place, a Flood Watch has been issued for the rest of San Diego County, extending through Wednesday. In addition to the heavy rainfall, isolated thunderstorms may develop inland and off the coast throughout the afternoon.

As the storm intensifies, a Tornado Warning has been issued for parts of South Bay and East County. Localities including Chula Vista, National City, Spring Valley, El Cajon, Santee, and Lakeside should take precautions, as the warning remains in effect until 12:45 p.m. The NWS reports that the system has weakened below severe limits, and the likelihood of a tornado has diminished.

San Diego State University has responded to the warning by placing all students under a "Take Cover" alert. Individuals on campus or in the surrounding areas are advised to seek shelter indoors, away from windows, to protect themselves from potential flying debris.

The rainfall is expected to taper off to a light shower by Wednesday afternoon. However, as of Tuesday morning, many areas in the county have already experienced rainfall of up to two inches, with North County, including Oceanside, breaking single-day rainfall records.

Unfortunately, the severe flooding has resulted in at least one fatality. Authorities confirmed the death of a migrant who attempted to swim across the swollen Tijuana River at the US-Mexico border.

The FOX 5 news team is continuously monitoring the storm and will provide updates as necessary. Stay tuned for the latest information on this ongoing weather event.