NEVADA COUNTY (CBS13) — Portions of Nevada County are under an evacuation advisory due to Sunday’s incoming storm.

The National Weather Service has issued a Flash Flood and Debris Flow Watch through Monday. Heavy rain is possible over the River Fire burn scar, which could create ash and debris flows.

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Debris flows occur over recently burned areas where is no longer vegetation to absorb water and keep soil in place.

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Additionally, a fast-moving mix of mud, ash, and debris can form and move downslope even faster than one could run or drive, according to the Nevada County Office of Emergency Services.

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The areas under an advisory are located west of Colfax.