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.

Hurricane Erin moves closer to US

Hurricane Erin rapidly intensified last week, going from a Category 1 hurricane to a Category 5 hurricane with winds of 160 mph in a matter of hours.