National Weather Service Radar is tracking several large and severe thunderstorm cells in Northern California.
The largest one is currently active along the crest of the Mendocino Range from just west of Lake Pillsbury to an area north east of Covelo.
A smaller cell is currently over State Route 299 in the vicinity of Big Bar.
A third, larger cell is over the Trinity Alps Wilderness Area.
Heavy rain, lightning strikes and thunder, accompanied by hail as large as a quarter is possible.
Smaller scattered thunderstorm cells are active over the Sierra Crest and Eastern Slope. One is approaching Burney.