Heavy rain dropped by Hurricane Hanna caused flash floods in South Texas on Sunday. Radar estimates of the rainfall indicated that 10-15 inches (3 to 5 meters) of rain fell on parts of Lower Rio Grande Valley during the passage of former Hurricane Hanna. A weather station in McAllen, Texas measured 8.24 inches (209 mm) of rain. Flash Flood Warnings were in effect for West Central Cameron County, Southern Hidalgo, Southwest Jim Hogg County, and Central Zapata County. The Arroyo Colorado in Harlingen, Texas rose from 5.2 feet (1.6 meters) to 20.72 feet (6.3 meters) and it was still rising.
Rain was still falling over parts of the Lower Rio Grande Valley even though the center of former Hurricane Hanna had moved over northeastern Mexico. At 5:00 p.m. EDT on Sunday the center of Tropical Depression Hanna was located at latitude 25.6°N and longitude 100.6°W which put it about 35 miles (55 km) west-southwest of Monterrey, Mexico. Hanna was moving toward the west-southwest at 9 m.p.h. (15 km/h). The maximum sustained wind speed was 35 m.p.h. (55 km/h) and there were wind gusts to 45 m.p.h. (75 km/h). The minimum surface pressure was 1002 mb.
The center of Hurricane Hanna officially made landfall on Padre Island 15 miles (25 km) north of Port Mansfield, Texas at 6:00 p.m. EDT on Saturday. At 6:00 p.m. EDT on Saturday the center of Hurricane Hanna was located at latitude 26.8°N and longitude 97.4°W which put it 15 miles (25 km) north of Port Mansfield, Texas. Hanna was moving toward the west-southwest at 8 m.p.h. (13 km/h). The maximum sustained wind speed was 90 m.p.h. (150 km/h) and there were wind gusts to 110 m.p.h. (175 km/h). The minimum surface pressure was 973 mb.
A Hurricane Warning was in effect for the portion of the coast from Port Mansfield to Port Aransas, Texas. Tropical Storm Warnings were in effect for the portions of the coast from Barra el Mezquital, Mexico to Port Mansfield and from Port Aransas to Port O’Connor, Texas.
Hurricane Hanna strengthened during Saturday and the maximum sustained wind speed at the time of landfall was 90 m.p.h. (150 km/h). The minimum pressure decreased to 973 mb during the day. A circular eye with a diameter of 35 miles (55 km) developed at the center of circulation. Winds to hurricane force extended out 30 miles (50 km) from the center of Hanna. Winds to tropical storm force extended out 90 miles from the center of circulation. A storm surge of up to 6 feet (2 meters) was occurring along the coast of Texas north of where the center made landfall. There were reports of minor wind damage in Port Mansfield.
Hurricane Hanna will move south of a strengthening high pressure system over the southern U.S. The high will steer Hanna toward the west-southwest during the next two days. On its anticipated track the core of Hurricane Hanna will pass north of Brownsville, McAllen and Harlingen, Texas. The center of Hanna will pass near Monterrey, Mexico on Sunday. Hurricane Hanna will weaken gradually while it moves inland. Hanna will drop heavy rain over South Texas and northeast Mexico. Flash floods will likely occur in parts of the Lower Rio Grande Valley.