Sierra Madre issues evacuation warnings and readies shelters as heavy-storm forecast raises mudflow risk

At the city council meeting, Sierra Madre officials warned residents to prepare for a significant storm that could produce mudflows and urged people in high-risk zones to follow evacuation notices.

City staff presented National Weather Service guidance and local modeling showing 2 to 4 inches of total rainfall with peak intensities up to 1 inch per hour, and cited county briefings that indicated some hours could reach as much as 2 inches per hour in the storm's early-morning window. Senior management analyst James Carlson told the council the city is aligning its actions with Los Angeles County forecasts and urged readiness for nighttime conditions when evacuations are most dangerous.

The warnings matter because heavy, concentrated rainfall can trigger debris and mudflows down canyons and channels that threaten homes and block streets. Officials described measures already in place to reduce risk: more than 500 feet of K-rail has been installed, thousands of sandbags have been distributed, and county crews have removed hundreds of thousands of cubic yards of material from debris basins. Carlson said the city and county still expect some mudflow into streets despite those efforts.

Council and staff outlined the operational details residents need now. The city said it is aligning evacuation orders and warnings with the county; an evacuation warning and order cycle was described as starting at 7 a.m. on the day after the meeting and modeled to expire the following day at 6 p.m., though officials said the timing could change with updated forecasts. The city identified the Sierra Madre Room, adjacent to the YMCA, as the evacuation shelter location coordinated with the Red Cross.

Officials also described temporary service changes for canyon neighborhoods under evacuation orders. The city said trash collection (Athens services) will not occur in canyon areas while an evacuation order is in effect. There were two statements about street parking: council-level comments emphasized enforcement of parking restrictions in identified red-flag zones to keep access for emergency vehicles, while staff noted that overnight parking restrictions would be lifted citywide for people who must move vehicles because of the evacuation. The council asked staff to clarify and publicize the final, map-based impact zones.

Public comment reflected those concerns. A resident, Yvette Del Corazon, said the Yucca Trail debris basin is at capacity and noted she believed the basin had been turned over to the city in 2015; she asked for more attention to that site. Councilmembers asked staff to return with an update on Yucca Trail/retention structures at a future meeting.

The council also reminded residents that evacuation warnings are the signal to prepare and that evacuation orders are mandatory; officials warned that ignoring an order can put residents and first responders at risk.

Looking ahead, the council requested a specifically focused update on the Yucca Trail retention structure at a future meeting so residents could get clearer maps and contingency plans.