Key notes: Structural Buildings WISSOTA Challenge Series officials were forced to cancel Friday's event at Grand Rapids Speedway, after a rain shower hit just following heat race action. ... Pat Doar of New Richmond, Wis., Derek Vesel of Hibbing, Minn., and Darrell Nelson of Hermantown, Minn., each earned heat race victories before the rain came. ... No date has been announced for a possible reschedule of the 27th annual WISSOTA Classic. ... The tour's four-race weekend continues on Saturday and Sunday at Hibbing (Minn.) Raceway.

Points chase: Before Halvor Lines: 1. Darrell Nelson (1,178); 2. Jeffrey Massingill (1,126); 3. John Kaanta (1,114); 4. Jake Redetzke (993); 5. Pat Doar (694).

Current weather: Overcast Mist, 59°F

Car count: 21

Polesitter: Jeff Provinzino

Heat race winners: Pat Doar, Derek Vesel, Darrell Nelson,  ,  ,  ,  ,  

Next series race: September 4, Hibbing Raceway (Hibbing, MN) $3,500