November 26, 2012 - A major shift in the weather pattern will bring wet and windy weather to Northern California beginning midweek and lasting through the weekend. Heavy precipitation is expected with high rainfall rates first on Wednesday then again on Friday. Mud and debris flows are possible, especially near areas burned during recent wildfires. Urban and small stream flooding is likely, with weir overflow and runoff through bypasses possible.
Main stem rivers will rise, though major flooding of larger rivers is not as likely due to low levels at reservoirs.
Snow levels above 7000ft, so most precipitation will fall as rain. Expect local power outages due to downed limbs and trees.
Heavy precipitation is expected with high rainfall rates first on Wednesday then again on Friday. Mud and debris flows are possible, especially near areas burned during recent wildfires. Fresh burn scars are the most susceptible to these mud and debris flows because wildfires clear out most of the vegetation that helps consolidate soils and absorb water. The charred remains of wildfires typically consist of loose hydrophobic soils that resist absorbing water leading to further risk of debris flow. Gravity then pulls the viscous debris mass downslope which can crush anything caught in front of debris flow.
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