stephanie padres works in a near by school. >> it's just warned everybody to stay indoors. there's a tornado warning and we just weren't to go outside until they heard other wise. >> reporter: plenty of people were outside in downtown san mateo despite the warning and the weather. >> it's been torrential i just came from sunnyvale. it's been very scary on the freeway. >>> this is near milpedas see that rooster tail of a splash. those cars are driving through 3-inches of water according to the chp. >> people just need to take it really slow. >> reporter: we talked to chp officer lori gonzalez at the scene of a dual trailer crash on highway 101 near mountain view. the truck smashed a highway sign and ended up in the bushes backing up traffic for about a mile. the driver is okay. fortunately his fuel truck was empty. >> the car in front of him applied their breaks, he also tried to apply his breaks. it skidded on the wet roadway. >> here in the santa cruz mountains when weather rolls in, it's not unusual to see accidents here on the roadway. i checked with the chp a short time