If you wait until the coastal storm becomes a hurricane and has an official name, it is likely too late to cover the cost of your trip. (trustedchoice.com)
Finally, tropical storms officially become hurricanes when their sustained wind speed exceeds 118 kilometers per hour. (physicalgeography.net)
This means that of the 6 to 10 named storms for this season, 1 to 4 storms are likely to become hurricanes in 2015. (edition.cnn.com)