Webthe warning has expired, but heavy rain and lightning were still possible. The san diego region remains under a flood watch through tonight because of. Webmore than 120 mudslides spread soggy dirt and debris through the steep hillside neighborhoods of los angeles on monday after an atmospheric river dumped. Webhurricane hilary is moving toward southern california. Here’s how to prepare and stay safe before and during the storm, heavy rain and potential flooding. Webthe mature stage is the most likely time for hail, heavy rain, frequent lightning, strong winds, and tornadoes. Eventually, a large amount of precipitation is produced and the. Webwet winter storm hits california, closing regional airport and trapping people in swollen rivers. A wet winter storm swamped california with heavy rainfall on monday,. Weba sunday update from the national weather service weather prediction center predicted risks of rainfall exceeding flash flood guidance across swaths of the. A truly unprecedented storm in modern history. Weba powerful atmospheric river storm unloaded more than 10 inches of rain across portions of southern california sunday and monday, triggering flash flooding,.