City of Sierra Madre Issues Green Flag Alert, 5/16/11, 3:30pm

The City of Sierra Madre has issued a Green Flag Alert for mudslides and debris flows in the hillside communities. The National Weather Service has forecasted 90% precipitation for tonight and 80% for tomorrow (5/17/2011).

A Green Flag Alert is issued when there is an 80% chance or more of precipitation. Affected residents should get ready for potential evacuation and keep close watch on weather forecasts. This includes residents of the Upper and Lower Canyon as well as any resident whose property abuts the hillsides.

Stage One: GREEN FLAG – Activated under a prediction of 80% – 100% chance of precipitation. Affected residents should get “READY” for potential evacuation. This includes keeping a close watch on weather forecasts.

Stage Two: YELLOW FLAG – Activated with an LA County Phase 1 mudflow forecast. This is described as small, isolated debris and mudflows possible at specific locations. Affected residents should get “SET” to leave their homes and may choose to voluntarily evacuate. Please note that all vehicles must be off the streets in potential mudflow areas during Yellow Flag alerts.

Stage Three: RED FLAG – Activated with an LA County Phase 2 or 3 forecast. Phase 2 includes moderate debris and mudflows at more widespread locations. Phase 3 – the potential exists for significant debris and mudflows to be widespread. Affected residents should “GO”, meaning they should immediately evacuate, and vehicles should not be parked on the streets.

For more information about mudslide and debris flow preparations, please visit and click “Emergency Preparedness Information” and on the home page. Updates will also be issued on SMTV3 (Time Warner-channel 3), Sierra Madre Community Radio (AM 1630), and the City’s Emergency Blog (