http://www.dagbladet.no/nyheter/2001/07/25/271074.html
This link is to a page (norwegian language) containing a picture of the nose of a SAS MD-81 that encountered severe hail at 15000 feet over Finland. The plane had 63 people onboard and made an emergency landing at Helsinki airport. The aircraft also got big dents in the wings. No engine trouble is reported. The crew wasn't prepared for/able to avoid the hail because they didn't have the weatherradar on, which supposedly isn't required when the weatherforecast is good (which it was, before the suprise hail was encountered) to minimize pilot workload and wear on the system. (Information taken from various newspaperwebsites.)
[ 25 July 2001: Message edited by: Dash8100 ]