SAN DIEGO — Tropical Storm Hilary‘s center moved right through San Diego County Sunday evening, making it the first tropical storm to hit Southern California in 84 years.

Sunday morning, Hilary was downgraded from a hurricane just hours before making landfall along Baja California’s coast, hitting about 150 miles south of Ensenada around 11:20 a.m.

The storm then continued on its northward trek, with its center hitting San Diego County by 5 p.m. By 6 p.m., meteorologists said the region had experienced its heaviest precipitation. Steady, intermittent rain was expected to continue through the evening as the back edge of the storm lifts out of the area, Alex Tardy with National Weather Service said to FOX 5.

Flash flood risk, however, will remain in place, particularly for residents in the mountains and deserts. The storm was then on track to head north into inland desert areas.

Initial forecasts from the National Weather Service about Hilary’s impact put estimated rainfall totals from three to six inches in parts of the county, with isolated amounts around 10 inches.

While rain was expected to continue into Monday morning, some mountain areas — like Mt. Laguna — had already received upwards of six to eight inches in the last 24 hours, according to NWS’s latest calculations on precipitation totals. Areas west of the mountains average about 10 inches of rain per year, according to the San Diego County Water Authority.

Sunday afternoon, NWS issued several flash flood warnings as far east as Jacumba and as far north as Mount Laguna.

Thousands of San Diego Gas & Electric customers lost power throughout the afternoon and evening, with power expected to be restored in many areas by Sunday night.

Around 3:40 p.m., NWS also issued a brief tornado warning in Alpine and Descanso. The warning was lifted by 4 p.m.

Trees and branches knocked over by strong winds were reported across the city in areas including La Jolla, Mission Hills and Allied Gardens.

The storm prompted San Diego Unified to postpone the first day of its school year until Tuesday. Across the county, many public beaches and parks, businesses and facilities were closed Sunday.

California Gov. Gavin Newsom proclaimed a state of emergency Saturday evening, and San Diego County officials also proclaimed a local emergency shortly thereafter.

Helpful links

Real-time updates

5 p.m. — Hilary’s center has moved through San Diego County, making it the first tropical storm to hit Southern California in 84 years.

4:30 p.m. — Gov. Gavin Newsom delivered an update on storm impact, reiterating that residents should continue to take precautions until Monday night. “Take nothing for granted,” Newsom said. “If you think, well, the skies are clear and I can go on a long jog or walk … just be cautious, wait until this time tomorrow night.”

3:50 p.m. — Flash Flood Warning issued for eastern San Diego County, including El Cajon, Santee and Poway, until 5 p.m.

3:40 p.m. — A Tornado Warning was issued for the mountain communities of Alpine and Descanso. The warning lasts until 4 p.m.

1:30 p.m. — San Diego Unified School District announces delay of first day of school until Tuesday “out of an abundance of caution”

1:04 p.m. — Flash Flood Warning issued for northeastern San Diego County, including Borrego Springs, until 4:15 p.m.

12:48 p.m. — Flash Flood Warning issued for central San Diego County, including Descanso, until 4 p.m.

11:25 a.m. — Flash Flood Warning issued for southeastern San Diego County, including Mount Laguna, Jacumba and Boulevard, until 2:30 p.m.

11:20 a.m. — Tropical Storm Hilary makes landfall along Mexico’s Baja coast

9:50 a.m. — Widespread rain continues to stream northward across Southern California

7:38 a.m. — Hilary “very near” the west coast of Baja California, says National Hurricane Center

7:30 a.m. — Hilary downgraded from hurricane to tropical storm with winds up to 70 mph

5:30 a.m. — Gusty east to northeast winds begin to strengthen along and below the coastal slopes of the mountains with gusts exceeding 40 mph at Crestwood in the San Diego County mountains and Fremont Canyon in the Santa Ana Mountains, says NWS

5:25 a.m. — Rain continues to overspread the region with NWS warning of heavy rainfall expected during the late morning hours

1:30 a.m. — Mostly light rainfall spreads into Southern California

Associated Press contributed to this report.