The National Weather Service in San Francisco is forecasting the return of rain starting this Wednesday, with a potentially significant weather system approaching the West Coast. As a "deep trough" develops in the northeastern Pacific, San Franciscans should anticipate the most intense rain late Wednesday into Thursday and see a slight chance for thunderstorms, according to an update provided by the NWS San Francisco.
With lighter showers possibly continuing on Friday, spilling into the weekend, residents are cautioned about potential impacts which include, "wet roadways, elevated levels on creeks and streams, and nuisance flooding." The NWS suggests taking advantage of the current favorable weather through Tuesday to finish any outdoor preparations. Information on the expected precipitation totals indicates a range between a "reasonable low end scenario and a reasonable high end scenario," with rain accumulation clarity anticipated as the system draws closer.
Adding to the mix, the Area Forecast Discussion from the National Weather Service details a warming trend through Monday, with unsettled patterns returning midweek. Offshore flow has kept conditions clear and dry, with expected temperatures to reach well above seasonal averages today. However, "there is some scope for significantly warmer temperatures on the western side of the coastal ranges and the Berkeley-San Leandro hills, particularly if stronger offshore flow develops than the current forecast."
Regarding the marine forecast, mariners are also warned of an upcoming shift in conditions. Winds will transition and strengthen from the south late Wednesday. The combined force of these winds with a building northwesterly swell will generate "rough waves," with notable sea heights reaching up to 15 feet before gradually diminishing through the weekend. This shift brings moderate to strong breezes that, will gradually return to northwestern later on Thursday.
The NWS advises residents to stay current with the latest forecasts as the storm approaches and to prepare for the impending shift in weather conditions. With the possibility of thunderstorms and subsequent showers lingering post the main rain event, continued vigilance is advisable for those particularly in flood-prone areas. Details on rainfall amounts and further weather developments promise to become more defined as the situation progresses.
