In June we typically look for tropical storm formation in the Gulf of Mexico, Western Caribbean Sea and off the Southeast United States coast. We look for development in those areas during the month of July as well, but we also start looking to the east over the tropical Atlantic. The developments over the tropical Atlantic come from tropical waves that emerge off the coast of African every three or four days. The graphic below shows the formation points of tropical storms during the month of July from the National Hurricane Center’s historical data set.
The historical data set shows that 105 tropical storms have formed in July from 1851 through 2008. Since the age of aircraft reconnaissance started in 1944, on average we have seen approximately one named storm form somewhere in the Atlantic Basin during July. 2005 had five storms form in July while many years have had no storms develop in this month.