May I meekly point out: it is possible they hit a hail shaft many miles from the CB radar signature. I am reminded of the Valujet DC-9 that hit hail external to the clouds going from ATL to Chattanooga many years ago.
"Between 10,000 and 12,000 feet, the flight was cleared to continue the climb to 23,000 feet. At that time, the crew asked for and received a 330-degree heading to remain clear of weather. The pilots stated that they were in visual meteorological conditions at this time and that their radar showed a light area of precipitation west of the line of weather. They stated that their radar also showed an approximately 10-mile gap between two storm cells in the line of weather and that, through this gap, they were able to see that no adverse weather conditions were on the other side.
"The flight crewmembers reported that as they proceeded through the gap, they observed an egg-sized piece of hail hit the center windshield, causing its outer pane to shatter. At the same time, they began experiencing turbulence that lasted about 10 seconds. They stated that approximately 1 to 2 seconds after the encounter with the first piece of hail, the airplane encountered significant hail, which lasted about 3 to 5 seconds and shattered the outer panes of the captain's and first officer's windshields. Both pilots stated that the hail caused significant damage to the skin of the airplane but that no control problems were noted. They stated the nose radome cover was torn off and that the noise level in the cockpit was high. They also stated that the airspeed indication was zero and the altimeter indications were erratic."
http://www.ntsb.gov/_layouts/ntsb.aviation/brief2.aspx?ev_id=20001211X10040&ntsbno=DCA98MA045&akey=1