MASON CITY, Iowa (AP) — Thousands of people lost power when a powerful thunderstorm swept through several communities in northern Iowa. Howling winds of up to 70 mph were reported Monday evening as hail pounded the Clear Lake-Mason City area. Several trees were toppled, power lines were knocked down and a dock was destroyed on Clear Lake. No injuries have been reported.

Alliant Energy says the outages peaked at just over 10,000 customers, but power was expected to be restored to all by late Tuesday morning. Street flooding also was reported in low-lying spots, especially under viaducts.