A Severe Thunderstorm Watch has been issued for areas west of Omaha until 11 p.m.; however, the metro area will likely have thunderstorms on and off throughout the overnight.
A train derailment has forced residents to leave their homes in and around Lester in the northwest corner of Iowa.
Twenty-five 25 cars left the tracks around 4:15 a.m. Sunday.
No injuries were reported, but a tank car carrying highly flammable liquefied petroleum gas was among the derailed cars, prompting special precautions.
Residences within a mile of the derailment were evacuated, and a hazardous-materials team was called to the scene.
It's unclear when the residents will be allowed back in their homes.
The cause of the derailment is being investigated.