The National Weather Service provides helpful tips to Santa Clarita Valley residents to be prepared for the upcoming thunderstorm with possibilities of flash floods and landslides.

The National Oceanic Atmospheric Administration (National Weather Service  has issued a Flash Flood Warning for Northeastern Los Angeles County including Acton, Angeles Crest Highway between Mount Waterman and Wrightwood and Mount Wilson and Mount Waterman, Big Pines, Lake Palmdale and Valyermo effective until 3:15 p.m. PDT on Wednesday, Sept. 9, 2015.

Structures in Acton wash downriver in the Great Flood of March 2, 1938. (File photo/SCVHistory.com)

NWS Doppler radar indicates a thunderstorm producing heavy rainfall in the warning areas. Flash flooding is expected and may possibly trigger debris and mud flows. The following are some safety tips to help prepare residents, who live in or below the burn and warning areas, for this storm system and potential debris mud flows:

If a flash flood occurs move immediately to higher ground.

* Be aware of streams, drainage channels, canyons, and other areas known to flood suddenly. Flash floods can occur in these areas with or without warnings such as rain clouds or heavy rain.

* If a landslide and/or debris flow occurs, danger is imminent, quickly move away from the path of the slide. Getting out of the path of the slide and/or debris mudflow is your best protection. Move to the high ground in a direction away from the path.

* Be aware of any sudden increase or decrease in water level on a stream or creek that might indicate debris mudflow upstream. A trickle of flowing mud may precede a larger flow. Look for tilted trees, telephone poles, fences or walls, and for new holes or bare spots on hillsides. Listen for rumbling sounds that might indicate an approaching landslide or mudflow. Be alert when driving. Roads may become blocked or closed due to collapsed pavement or debris.

Los Angeles County residents and businesses, including persons with disabilities and others with access and functional needs, may call 211 LA County for emergency preparedness information, and other referral services. The toll-free 2-1-1 number is available 24 hours a day and seven days a week.