Delta is strengthening steadily due to presence over 85-86F water, light shear and excellent upper ventilation. The improving environment allowing Delta to intensify is in-part due to the heat release of weakening Gamma. The heat release strengthened the Florida subtropical ridge which is now pushing Delta more quickly west-northwestward. The warmer mid-to-upper atmosphere has also caused the upper shear near Delta to ease. The position of the jet stream and upper shear axis across the western Gulf of Mexico coupled with the anti-cyclone over Florida has provided Delta with excellent upper ventilation to allow Delta to fully express itself as a category-2 hurricane.