The U.S. National Weather Service has issued a tornado warning for parts of Northern California. The NWS told people to "take shelter now." Video above from Scotts Valley tornado. The warning was for people in northern central Tehamd County and southern central Shasta Count and is in effect until 6 p.

Athens was under a severe thunderstorm warning Dec. 28 when a brief tornado struck downtown, causing heavy damage.

The National Weather Service issued the warning for northern Tehema County and southern central Shasta County, but it expired at 6 p.m. The agency then issued a special weather statement cautioning residents in Shingletown, Lyonsville, Paynes Creek and Manton about a strong thunderstorm that would impact the areas through 7 p.m.