The National Weather Service issued a series of severe-thunderstorm warnings and watches Monday for large sections of eastern Colorado and northern Illinois, cautioning that the fast-moving systems could unleash golf-ball-size hail, wind gusts up to 70 mph and torrential rainfall. In Colorado, warnings were successively posted for Lincoln, Adams, Arapahoe, Cheyenne, Kit Carson, Logan, Phillips, Sedgwick, Washington and Yuma counties between mid-afternoon and early evening MDT. A broader watch covers eastern Colorado, western Kansas and southwestern Nebraska until 10 p.m. MDT as storms track eastward across the High Plains. Farther east, NWS Chicago placed Cook, DuPage and a dozen other northern Illinois counties under a watch through 6 p.m. CDT and warned that storms moving at 20–25 mph could produce 70 mph straight-line winds and heavy downpours. The agency said saturated ground from weekend storms heightens the risk of flash flooding, and the region is still working to restore electricity after hundreds of outages.