"The shower activity is going to continue throughout the day, National Weather Service meteorologist Lamont Bain said. As it pertains to thunderstorm risk, there's probably a 10-to-15 percent chance. There is a lot of instability between the upper low pressure and the lower air. That upper low is going to spin out there and not move much, and that's why the rain showers are going to be scattered throughout the day and why the best chances for thunder are out over the ocean."
"The heaviest rain came in the Santa Cruz Mountains, with more than 1 inches falling at Mt. Umunhum, Ben Lomond and Loma Prieta in the 24 hours before 7 a.m. Wednesday. Elsewhere, San Francisco received one-third of an inch, while Oakland and San Jose had a quarter-inch. Mount Diablo received about a half-inch but the cities in its shadow did not get much. Concord received just four-hundredths of an inch, the most of the nearby cities."
"As it does so, it is expected to weaken and the winds associated with Tuesday's rain are expected to calm down. The weather service said the system also will carry with it lift, instability and moisture, the three elements needed for thunderstorms. By Thursday, the rain from this low pressure system is expected to be finished. Another storm system then is expected to descend from the north over the weekend, bringing more rain."
A slow-moving low-pressure system off the Central Coast produced scattered light showers across the Bay Area and heavier totals in the Santa Cruz Mountains. Mt. Umunhum, Ben Lomond and Loma Prieta recorded more than 1 inch, while San Francisco saw about one-third inch and Oakland and San Jose about a quarter-inch. Instability between the upper low and lower air raised thunderstorm chances to roughly 10-to-15 percent, especially over the ocean. The system is expected to weaken and exit by Thursday, and another storm is forecast to move in from the north over the weekend.
Read at www.mercurynews.com
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