Local authorities urged residents Tuesday to get prepared for what could be a potentially dangerous storm set to slam the region, potentially triggering flooding, mudslides or debris flows, particularly in the recent wildfire burn zones.
“I want to really urge everyone to take the alerts seriously here,” National Weather Service meterologist Ariel Cohen said during a Tuesday morning news conference with Mayor Karen Bass at Los Angeles City Hall. “… We have a return to some potentially dangerous weather conditions across the area. Most places are not going to experience those dangerous weather conditions, and it’s possible we get through this rain event without any significant problems, but the potential is there. And those across the region … are encouraged to be taking the weather alerts seriously.”
The NWS has already described the multi-day storm system as likely to be “the biggest precipitation producer so far this season.” Cohen said it will be the “most significant storm” of the year, with the NWS already issuing a flash flood watch for the bulk of the Southland that will be in place from Thursday afternoon through late Thursday night.
Clouds are expected to cover most of the region starting Wednesday, with as much as a half-inch of rain possible. But the brunt of the storm will arrive Thursday, with widespread rain likely to impact the area for about 36 hours.
Cohen said the primary concern will be from 2 p.m. Thursday through 2 a.m. Friday.
“That 12-hour window is when we’re going to be looking at bursts of heavy rain,” he said.
Bass and Cohen both urged residents to be prepared to evacuate if necessary. Bass urged people to sign up for emergency alerts though notifyla.gov. And while the primary concern locally is in the recent burn areas, Bass stressed that the warning “is for all of Los Angeles,” so residents across the city and region should be prepared.
Cohen said residents should `have an evacuation plan prepared,” noting that “seconds mean the difference between life and death when it comes to those orders and warnings.”
While urging people to have evacuation plans and escape routes pre-planned, he reminded residents that there is a chance of some “pretty significant urban flooding” from the storm, which could leave to streets and freeways being flooded.
“Do not ever drive through a flooded roadway,” he said.
Forecasters said the storm overall could drop 1.5 to 3 inches across much of the region, with 3 to 6 inches in the coastal foothills and mountains.
Snow levels will be at about 5,000 feet Wednesday, rising to 7,000 feet Thursday then falling back to about 5,000 feet. Higher elevations could see “several feet” of snow.
High temperatures will be in the 50s each day of the storm, which is about 5 to 10 degrees below normal, according to the NWS.