In the meantime, parts of the Bay Area saw rain throughout the day. There were light showers on Highway 101 in Palo Alto, a thunderstorm reported in San Jose, and several reports of pea-sized hail in Fremont at about 7:25 a.m.
A light, steady rain fell in San Jose in the afternoon. Wet roads slowed drivers down on Saratoga Avenue near Prospect Road.
And high winds caused problems in the North Bay on Thursday. The winds knocked down power lines near Highway 116 outside Petaluma. Crews were on the scene to repair the lines and get the power back on for more than a dozen customers who were without for a time. Most of the power has been restored.
VIDEO: ABC7 Weather Forecast
In the evening, ABC7 News Meteorologist Sandhya Patel reported that most of the showers were concentrated in the South Bay and Monterey Bay areas. She says showers will diminish overnight with sunnier conditions expected for Friday and mild weather for Mother's Day.
A funnel cloud was reported in Sonoma County at 5:54 a.m. It was later determined that despite its ominous appearance, it wasn't a funnel cloud.
"There were lots of cumulous clouds and they were forming into a big head," said Sebastopol resident David Myrick.
Photos showed a swirling mass, which looked like a funnel cloud forming north of Sebastopol near Lake Sonoma.
Myrick was pretty startled.
"I was worried about my greenhouse blowing over because there was wind in all kinds of directions," he said.
TRACK THE RAIN: Street level interactive map
Luckily there was no damage at Myrick's place or anywhere else around the city, according to police. Fellow Sebastopol resident Bob Jones took notice, too
"It's scary to think about because I've been in tornadoes," he said.
PHOTOS: Sierra hit with snow, Bay Area sees rain
The National Weather Service says it wasn't a funnel cloud. Instead, it was a downdraft of precipitation known as virga.
Myrick says it was still impressive, whatever it was.
"I've never been around funnel clouds," he said. "But you can tell me right now that it wa definitely something to consider."
It's easy to track the storm on Live Doppler 7 HD anytime! Click here to download the ABC7 Weather App for free on Apple's App Store or Google Play.
ABC7 News Meteorologists Mike Nico and Sandhya Patel and reporter Cornell Barnard contributed to this report.
Pretty good rain in some areas south of us! pic.twitter.com/lR8kR5wRMW— Sandhya Patel (@SandhyaABC7) May 8, 2015
Some areas had measurable rain here but others nothing. Showers wind down overnight. pic.twitter.com/DnO2IHXPYI— Sandhya Patel (@SandhyaABC7) May 8, 2015
Hints of blue from Emeryville cam peaking through the clouds. pic.twitter.com/EqqHtaUewX— Sandhya Patel (@SandhyaABC7) May 7, 2015
Radar returns are increasing in S & E Bay now. I hope you have your umbrellas handy. pic.twitter.com/rVgz9GyuwF— Sandhya Patel (@SandhyaABC7) May 7, 2015
Radar's tracking snow in the Sierra. Chains required on SR 4. Winter Weather Advisory until 5am FRI. pic.twitter.com/C6OI19DxqN— Sandhya Patel (@SandhyaABC7) May 7, 2015
The storm that brought us showers today is diving southward, leaving us only a minimal chance of more rain tomorrow. pic.twitter.com/dFi3D6SDdv— Spencer Christian (@SpencerABC7) May 7, 2015