NHC now forecasts 13 to 18 named tropical systems, 5 to 9 could become hurricanes, and 2 to 5 could become major hurricanes.

Hurricane forecasters were tracking three disturbances in the Atlantic Ocean Sunday afternoon, one of which is expected to briefly become the season's fourth named storm as it moves away from the U.S. UPDATE: Tropical Storm Dexter forms in Atlantic as forecasters track two other disturbances

Atlantic hurricane season is about to hit its stride. August through mid-September is historically the most active stretch of the season, and while there have been a handful of short-lived named storms,