Increase in 500 mb drying of the Tropical Atlantic basin became noticeable around 2011. This feature has been common since then during the  June to September period. Numerous systems during the peak of the hurricane season have had issues with dry air. The 2011-2016 era has experienced the driest air on record extending across the MDR region of the Atlantic and Caribbean. This dry air is a bit of a mystery to forecasters with some theories revolving around tropical drying related