Low wind shear and very warm water in the Atlantic Basin will spark a dramatic increase in hurricane formation in August and September, according to a newly updated hurricane forecast.

This morning forecasters William Gray and Phil Klotzbach of Colorado State University released their prediction that 18 named tropical storms will form before hurricane season ends November 30.

The pair thinks ten of those storms will become hurricanes, with winds of at least 74 miles (119 kilometers) an hour. Five of those will strengthen into major hurricanes, with winds exceeding 110 miles (177 kilometers) an hour, the forecasters predict.

The updated forecast is based in part on the recent