 During the latter part of July 10, Dennis traversed an area with lower ocean heat content. Coupled with entrainment of mid- to upper-level dry air, notable weakening took place as the hurricane approached the Florida Panhandle. Around 19: 30 UTC, Dennis made its third and last landfall as a major hurricane over Santa Rosa Island, between Navarre Beach and Gulf Breeze, with estimated winds of 120 mph (195 km / h) and a pressure of 946 mbar (hPa; 27.94 inHg). A Florida Coastal Management Program tower in Navarre observed sustained winds of 99 mph (159 km / h) and a gust to 121 mph (195 km / h). Dramatic weakening ensued once the hurricane moved onshore, with winds falling below tropical storm-force in just 12 hours. Upon weakening to a depression on July 11, handling of operational advisories was transferred from the NHC to the Weather Prediction Center (formerly the Hydrometeorological Prediction Center).
