Environment
Midweek storm to bring widespread rain and cooler temperatures
A significant cooldown and the season’s first storm are expected to change Southern California’s weather this week, with widespread rain likely from Tuesday night or Wednesday through Thursday.
The National Weather Service said forecast timing still carries uncertainty, but the system is expected to bring roughly 12 hours of rain and a slight chance of thunderstorms as it moves through the region.
Timing: Tuesday night or Wednesday through Thursday
Expected rainfall: 0.75 to 1 inch in many areas
Foothills and coastal slopes: Up to 2 inches possible
Cooler days and a chance of thunderstorms
Highs are forecast to fall into the mid-60s to lower 70s on Wednesday and Thursday. Forecasters said rainfall rates do not currently appear hazardous unless thunderstorms develop, though totals could end up higher than the main forecast.
Marine conditions may also deteriorate during the storm. The weather service noted a 10% to 20% thunderstorm chance over coastal waters Wednesday afternoon and night, with possible lightning, erratic winds and waterspouts.
Forecast details can change as the system approaches. Residents should check current alerts and local forecasts before traveling.
Official forecast: Read the National Weather Service discussion →
Independent local coverage: Read the ABC7 forecast →