DES MOINES, Iowa (AP) — Tornado warning sirens have sounded in the central Iowa counties of Polk, Dallas and Madison — as well as in Des Moines — as strong storms sweep the area. The Des Moines Register reports that the sirens went off between about 5:35 p.m. and minutes before 6 p.m. Thursday as the National Weather Service issued tornado warnings for those counties, southwestern Story County and southeastern Boone County.

The service says the storms are capable of producing a tornado and that a trained spotter saw a funnel cloud near Dallas Center-Grimes High School just after 5:40 p.m. No reports of tornadoes touching down were immediately reported.