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JEFFERSON COUNTY, Colo. — A woman is in critical condition after being found unresponsive at the swim beach at Chatfield Reservoir on Friday afternoon.

Hope Casell, an OB/GYN from Parker, was paddle boarding with her three sons, ages 14, 13 and 11, along with a friend of the boys, 11, about 1 p.m. Friday when a storm came up, the Jefferson County Sheriff’s Office said.

Heavy wind, rain, lightning, thunder and hail occurred, quickly causing large waves.

The four boys, who were wearing life vests, were able to make it to shore safely.  Casell was found in the water and unresponsive.

She was wearing an inflatable life ring that could be activated by pulling a cord, but it was not inflated when she was found, the sheriff’s office said.

The family dog, a golden retriever, was also on the board with Casell and has not been found.

She was transferred to Littleton Hospital where she remains in critical condition.