San Diego increases flood preparations as multi-day storm brings heavy rain, wind, mountain snow risks

City crews target flood-prone areas ahead of early-week storm

San Diego is expanding flood-readiness operations as a winter storm system is expected to move into San Diego County early in the week, bringing periods of rain, gusty winds and the potential for heavier precipitation in some locations. City officials say the preparations are focused on neighborhoods with a history of flooding, including Southcrest, as well as low-lying corridors such as Mission Valley and other areas where stormwater can quickly overwhelm drainage infrastructure.

As part of the response plan, the city is increasing monitoring of nearly 46,000 storm drains and prioritizing maintenance intended to keep runoff moving through channels rather than backing up into streets and yards. Work described by city officials includes clearing debris and vegetation from stormwater channels, cleaning inlets, and staging equipment used during high-flow events.

Drainage maintenance, pump deployments and reporting channels

Officials said maintenance has been ongoing throughout the year, with added attention in South San Diego along Chollas Creek. The aim is to reduce blockages that can cause water to pond during intense downpours. City staff are also preparing to deploy pumps and sandbags in vulnerable areas as conditions warrant, and to respond to service calls during the storm period, including on the Presidents Day holiday.

Residents are being asked to report flooding, blocked drains and storm-related hazards through the city’s Get It Done reporting system so crews can be dispatched. The city has emphasized that it cannot monitor every location in real time and relies on reports to identify emerging problems quickly.

Countywide flood monitoring and warnings

San Diego County maintains an ALERT Flood Warning System with more than 100 monitoring stations that include rainfall sensors, stream gages, reservoir level sensors and weather stations. The system supports situational awareness during storms and helps inform warnings and messaging when water levels rise in creeks, rivers and other channels.

What the storm could mean for travel and neighborhoods

Forecasts for the incoming system indicate widespread rain potential and the possibility of heavier totals in the mountains, where snow levels can fall low enough to create hazardous driving conditions on higher-elevation routes. For urban areas, the primary concern is street flooding in poor-drainage locations, especially if rainfall rates intensify or debris restricts flow into storm drains.

• Flooding risk is typically highest in low-lying streets, underpasses and near channel crossings.
• Blocked storm drains can rapidly increase ponding even during short bursts of heavy rain.
• Mountain travel can be affected by snow, reduced visibility and strong winds.

City officials say crews will be positioned to respond to flooding and storm-related issues as reports come in, while ongoing drain and channel maintenance is intended to reduce backups once rainfall begins.

Local and county agencies are expected to continue adjusting staffing and field operations as the storm approaches and evolves, with conditions monitored through drainage inspections and the region’s sensor network.