Today there are scattered showers in the Bay Area, and from Santa Cruz northward, there may be a few thunderstorms.
The National Weather Service says that This weather action is happening in San Francisco, CA because an upper trough is making the mid and upper levels sharper. This makes the low-level CAPE higher and the lapse rates steeper.
There won’t be much rain; many places will only get a few hundredths to a tenth of an inch.
From the North Bay to the Bay Area, winds could hit 30 to 40 miles per hour, and the rainiest parts of the day will happen in the late morning and afternoon.
It’s still raining in Sonoma and Marin counties, with amounts between a few hundredths and tenths of an inch.
According to the National Weather Service, a cold front will bring even colder weather starting tonight. By tomorrow morning, the whole area will be in the 30s and 40s.
It’s going to be even colder over the weekend. It’s possible that there will be a Freeze Watch because temperatures could drop to or below freezing in many places inside on Saturday and Sunday mornings.
“A cold front will begin to push south through our area later tonight, dropping max temperatures another 5 degrees or so for Friday after a chilly start to the day,” the Weather Service says.
Friday will bring strong northwesterly winds, with gusts that could reach gale force for those going out to sea. The Marine section says that rough seas will last until Saturday because of a buildup of northwest swell.
This comes with a High Surf Advisory that will last until 11 AM PST on Saturday. This is also the start of the king tide season, when tides are up to 1-1.5 feet higher than usual.
People who live or go to the beach along the coast are warned by the National Weather Service that areas that usually flood during king tides will probably flood a couple of hours before or after the daily biggest tides.
Aviation predictions say that VFR-MVFR conditions will stay in place because of scattered showers, some of which could be heavy, near the north central coast tonight and Friday morning.
The coming cold mid- to upper-level trough could have an effect on airport operations. If reports say so, the current 12z KMRY and KSNS TAFs will need to be changed.
