Angeles Forest Highway, Big Tujunga Canyon Road and Upper Big Tujunga Canyon Road will be closed to all traffic except emergency vehicles.
Residents living in the burn areas will not be permitted to use the roads until the closures are lifted.
After the storm systems have passed, Public Works will reopen the roads after inspecting for debris and damage.
Residents in the burn areas were advised to remove their vehicles from streets where possible, and to monitor weather reports.
"Worst case scenario is if the mountain actually lets loose and we have a sea of mud that is very unforgiving, moving very fast and people can be overwhelmed very quickly if we don't act in advance," said Lt. Len Jundshamer with the Sierra Madre Police.
The current threat level in the burn areas was at green Friday night but officials said it could be raised to yellow over the weekend with the height of the storm expected to come at 2 a.m. Sunday.
Residents in the previously burned areas can obtain sandbags from the following locations:
- Fire Station 24, 9411 Wentworth Street, Sunland
- Fire Station 91, 14430 Polk Street, Sylmar
- Council District 2 field office, 7747 Foothill Boulevard, Tujunga
- Sand and sandbags are available at the vacant lot located at the intersection of Day Street and Pali Avenue, Tujunga
In the event that evacuations orders are issued, the following locations (which are accessible to persons with disabilities) will be used as shelters:
- Sunland Park Recreation Center, 8651 Foothill Blvd., Sunland, (818) 621-2321
- Sunland Senior Citizens Center, 8640 Fenwick St. Sunland, (818) 353-9571