A powerful and dangerous late season storm system has generated more than 50 tornadoes and killed at least 3 people across the US midwest, and will continue to develop over the evening hours. The town of Washington, Illinois has been effectively flattened, and the National Weather Service is warning that millions remain at risk as the system moves east. Chicago is in the range of the enormous system, which stretches from the middle south into the northern Midwest and is expected to sweep into the mid-Atlantic states within hours.

Stay ahead of the weather with the Unknowncountry Climate Watch section, where violent autumn storms were predicted for the US last summer.