Hurricane Erin raced from a Category 1 to a Category 5 storm. If Erin keeps ramping up, is there a Category 6?

Storms that ramp up so quickly complicate forecasting and make it harder for government agencies to plan for emergencies. Hurricane Erick, a Pacific storm that made landfall June 19 in Oaxaca, Mexico, also strengthened rapidly, doubling in intensity in less than a day.

Anyone who rides out a Cat 5 storm in a high-rise should be prepared for an eyes-wide-open nightmare and an apocalyptic aftermath, one expert warns. The higher up you are, the stronger the winds

Hurricane Erin is moving east of the U.S. coast and will bring strong waves and rip currents to Florida's east coast – and it comes as the National Center is eyeing two more tropical waves in the Atlantic.