Warm oceans strengthened Hurricane Francine and could power more Fall storms

Warm water in the Gulf of Mexico helped quickly strengthen Hurricane Francine, creating danger for Louisiana residents rushing to buy supplies and secure their homes ahead of the storm's landfall Wednesday.

Warm ocean water is essential for forming and strengthening hurricanes. Heat helps the water evaporate faster, fueling the storm and producing more rainfall.

Mid-September is typically the peak of hurricane season and Francine moved through a part of the ocean that held an exceptional amount of energy.

As of Wednesday afternoon, Francine had strengthened to a Category 2 hurricane with sustained winds of nearly 100 mph (161 kph).