Bay of Campeche
The depression initially moved to the northwest under the influence of a mid-level trough. Around 00:00 UTC on August 5, about 24 hours after developing, the cyclone intensified into a tropical storm while offshore northeastern Honduras; the National Hurricane Center assigned the name Diana to the system. Diana would subsequently strengthen further, with winds reaching 65 mph (105 km/h) before the storm made landfall near Felipe Carrillo Puerto, Quintana Roo, around 20:00 UTC later that day. The storm weakened while crossing the Yucatán Peninsula, and emerged into the Bay of Campeche early on August 6 with winds of 50 mph (80 km/h). Upon entering the Bay of Campeche, Diana began moving nearly due west as a result of a weakening trough of low pressure. With conditions being more favorable in the Bay of Campeche, Diana quickly intensified, becoming a hurricane around 06:00 UTC on August 7. Twelve hours later, the cyclone intensified into a Category 2 hurricane and attained its peak intensity with maximum sustained winds of 100 mph (165 km/h) and a minimum barometric pressure of 980 mbar (hPa; ). At 19:00 UTC on August 7, just one hour after attaining peak intensity, Diana made landfall in Tamiahua, Tamaulipas, at the same intensity.