 Tropical Storm Erin formed on August 16 in the Gulf of Mexico from a persistent area of convection . Based on reconnaissance data received from an NOAA plane investigating the depression , it was upgraded to Tropical Storm Erin on August 15 . It weakened to a tropical depression as it made landfall near Lamar , Texas , on August 16 , and the NHC issued its last advisory on the system shortly thereafter as it moved inland . Early on August 19 after entering Oklahoma , the remnants of Erin suddenly re @-@ intensified to maximum sustained winds of 60 mph ( 95 km / h ) a short distance west of Oklahoma City . 
