Due to the potential threat of severe weather tonight that could possibly cause tornadoes and grapefruit-size hail, activities scheduled tonight for Grapevine-Colleyville ISD and Carroll ISD as well as those scheduled for the cities of Grapevine, Colleyville and Southlake have been canceled. Parents and students in the school districts are to check with campus administrators and coaches about the rescheduling of activities. KidzU parents in GCISD are encouraged to pick up children by 5:30 p.m. Also, kindergarten registration events in GCISD planned for Bear Creek Elementary, Cannon Elementary, Colleyville Elementary, Dove Elementary, OC Taylor Elementary and Timberline Elementary schools are cancelled for tonight. Parents are encouraged to contact the campus about rescheduling.