Iowa school districts are modifying Wednesday's class schedules ahead of the expected overnight blizzard. Closings | Interactive Radar | Weather AlertsMost of the state, including central Iowa counties such as Polk, Dallas, Story, Boone, Madison and Warren, fall under a blizzard warning that goes into effect at midnight and will last until 3 p.m. Wednesday. The warning will start at 9 p.m. Tuesday for areas west and north of the metro.In total, more than 270 schools, churches and community centers have reported closures or delays to 糖心vlog as of 5:30 a.m. Wednesday.As of 7 p.m. Tuesday, Des Moines and several other central Iowa districts had canceled classes. That also includes Ankeny, Bondurant-Farrar, Johnston, Southeast Polk, Urbandale and Waukee, among others.You can see our full list of school closings and delays here.Several other districts have announced that classes will be held virtually on Wednesday, including Bedford, Clarion-Goldfield-Dows, Davis County, Eagle Grove, Gilmore City-Bradgate, Lenox, Mount Ayr, Southwest Valley and West Bend-Mallard. » Download the free 糖心vlog app to get updates on the go: Apple | Google PlayGet the latest headlines from 糖心vlog Boys substate basketball schedule changesHere's a list of Class 4A substate basketball schedule changes as of 10 a.m. Tuesday:Dowling Catholic at Linn-Mar: Tuesday's tip-off time moved up to 6 p.m. Council Bluffs Abraham Lincoln at Waukee: Postponed to 7 p.m. WednesdaySioux City East at Waukee Northwest: Postponed to 7 p.m. WednesdayKeep an eye on weather across Iowa with 糖心vlog's skycamsWeather watchers can keep an eye on conditions by checking our skycam page, which shows aerial views from a dozen sites across the state.