The National Weather Service in San Francisco predicts the return of rain by Wednesday as a significant weather system forms off the West Coast. A “deep trough” developing in the northeastern Pacific is expected to bring the heaviest rainfall from late Wednesday into Thursday, with a slight chance of thunderstorms, according to the latest NWS San Francisco update.
Lighter showers may persist into Friday and the weekend. Residents are advised to prepare for potential impacts, including wet roadways, rising creek and stream levels, and minor flooding. The NWS recommends using the current dry stretch through Tuesday to complete outdoor preparations. Rainfall totals remain uncertain, with forecasts outlining a “reasonable low-end scenario and a reasonable high-end scenario,” to be refined as the system nears.
The Area Forecast Discussion highlights a warming trend through Monday before the unsettled pattern returns midweek. Offshore flow continues to keep conditions clear and dry, pushing temperatures well above normal for this time of year. Notably warmer temperatures may develop along the western side of the coastal ranges and the Berkeley–San Leandro hills if offshore winds strengthen beyond current projections.
Mariners should also take heed as the marine forecast calls for changing conditions. Winds will shift and strengthen from the south late Wednesday, combining with a building northwesterly swell to create rough seas. Wave heights could reach up to 15 feet before gradually easing through the weekend. Moderate to strong breezes will return to a northwesterly direction later Thursday.
The NWS urges residents to stay updated as the storm approaches and prepare for rapidly changing conditions. With thunderstorms and lingering showers possible after the main rain event, continued caution is advised—especially in low-lying or flood-prone areas.
Leave a Reply