Yes, that was thunder you woke to Wednesday morning and perhaps Thursday as well.
Even California gets the occasional thunderclap. But this was a pretty mild patch, spun off from a tropical depression off the Mexican coast that worked its way north where it broke up in the cooler waters off California and sent waves of moist clouds over the state.
"This will continue on through (Thursday)," said National Weather Service forecaster Diana Henderson, "with an isolated chance of something hitting the ground, either lightning or precipitation."
The storm remnants began moving on shore overnight Wednesday with slight patchy rainfall and occasional lightning.
"There's not enough moisture in it to reach the ground but enough instability in it that the lightning reaches the ground," Henderson said.
The Santa Cruz area got the most of the slight rainfall -- two hundredths of an inch -- while Half Moon Bay got about half as much, Henderson said. Traces of rain were recorded at the San Jose and Oakland airports.
There were several reports of cloud-to-cloud and cloud-to-ground lightning strikes, but no reports of damage, Henderson said.
By Wednesday evening most of the storm activity had moved east to the Sacramento area and Sierra foothills, but offshore patches were still moving shoreward.
Thursday's forecast calls for isolated chances of thunderstorms with clearing by Friday and a return to normal late-summer weather
"The muggy instability will move on," Henderson said.
Contact John Woolfolk at 408-975-9346. Follow him on Twitter at Twitter.com/johnwoolfolk1.