From RRCA Maryland (Dwight Mikilus): Bad News. The 10 Mile Challenge has been cancelled for this Sunday. Repeat, the 10 Mile Challenge will not be held this Sunday. This was a joint decision between the HC Howard County Striders and the Howard County Police. This has been a tough winter for scheduled races. Unknown at this time if/when the race can be held. We had a full house of nearly 900 registered club runners. Old Man Winter is showing his fury.