The 2017 Atlantic hurricane season is forecast to be more active than historical averages with regard to the number of named storms, according to the latest forecasts released by Colorado State University, the National Oceanic Atmospheric Administration and The Weather Company, an IBM Business.
The 30-year historical average (1981-2010) for the Atlantic Basin is 12 named storms, six hurricanes and three major hurricanes. A major hurricane is of Category 3 strength or higher on the Saffir-Simpson Hurricane Wind Scale.
NOAA issued its forecast at the end of May and called for:
Eleven to 17 named storms – including April's Tropical Storm Arlene.
Five to nine of which would become hurricanes.
Two to four of which would become major hurricanes.
An important note is that Tropical Storm Arlene, which formed in April, is included in the seasonal forecast numbers in the outlooks.