How new research led to North Dakota tornado's EF5 upgrade

A powerful tornado struck Enderlin, North Dakota, on June 20, causing significant damage and leading to a rare EF5 classification after new research. Here's what went into the new research that led to the upgraded classification.

Monday night forecast

Mostly cloudy tonight with mild October air. Lows in the 60s. Highs climb back into the low 80s Tuesday. Scattered showers return Wednesday, followed by a cooler, fall-like finish to the week. Here’s the forecast.