At least nine people were hit by lightning on a crowded beach at Boyd Lake Sunday, a day after extreme weather was blamed for a fatal boating accident there.Four people were transported to the hospital, Capt. Allen Simons of the Thompson Valley Emergency Medical Service said. Their conditions weren't immediately known.The five other people hit by lightning were treated at the beach.The afternoon storm also caused wind gusts up to 75 mph in parts of northern Colorado and tornados near Holyoke and Watkins in the eastern half of the state. No damage was reported.In northwestern Colorado, lightning strikes from thunderstorms in recent days were blamed for sparking 23 fires. The largest, between Rangely and Meeker, was burning on about 130 acres, the Northwest Colorado Fire Management Unit said Sunday.Strong winds are believed to have caused a boat to capsize on Saturday on the lake. A man and five women were on the boat as part of a family outing. The two women who died weren't identified. Four others were taken to the hospital, where one person was hospitalized in the intensive care unit in critical condition. The other three were treated and released.