The satellite map shows the upper level wind differences in the atmosphere as hurricane seasons approaches:
The effect of wind shear on hurricane formation is well documented. While most hurricane activity occurs in the tropics, strengthening develops during an El Niño or strong Pacific Ocean El Niño. These factors increase the odds that tropical storms and hurricanes will develop off the U.S. coast. The Atlantic hurricane season typically runs from June 1 through November 30.
THIS SEASON
The average number of named storms in the Atlantic basin over a 5-year period beginning in 1995 (the latest year for which data are available) is between 10 and 15. This is in line with the past five years. Since May 1, 2005, the Atlantic basin has seen 9.0 named storms, including 6.4 hurricanes. The same period (with the possible exception of 2012) has seen 6.3 named storms, including 3.2 hurricanes. There are 12 named storms within 74 days of May 1. There were 18 named storms within 35 days. There were 13 named storms within 45 days. There were 8 named storms within 30 days.
Atlantic Hurricane Season: Summary
North Atlantic
May 1, 2015-April 30, 2016 (average, 8 named storms, 2 hurricanes
Monthly avg. Atlantic activity, 1979-2015
6 named storms
5 hurricanes
2 major hurricanes
Upper Central Atlantic
May 1, 2015-April 30, 2016 (average, 1 named storm, 0 hurricane
Monthly avg. Atlantic activity, 1979-2015
4 named storms
3 hurricanes
2 major hurricanes
Triple Crown Monthly avg.
May 2015-April 2019
3 named storms
2 hurricanes
2 major hurricanes