A reconnaissance plane investigated Marty on Monday afternoon and the data showed that Marty was a hurricane. At 5:00 p.m. EDT on Monday the center of Hurricane Marty was located at latitude 16.7°N and longitude 102.1°W which put it about 75 miles (125 km) south-southwest of Zihuatanejo, Mexico. Marty was moving toward the northeast at 6 m.p.h. (10 km/h). The maximum sustained wind speed was 80 m.p.h. (130 km/h) and there were wind gusts to 95 m.p.h. (155 km/h). The minimum surface pressure was 986 mb.
The government of Mexico has issued a Hurricane Warning for the portion of the coast from Tecpan de Galeana to Lazaro Cardenas. A Tropical Storm Warning has been issued for the coast from Tecpan de Galeana to Acapulco. A Tropical Storm Watch has been issued for the portion of the coast from Lazaro Cardenas to Punta San Telmo.
Although an upper level trough over Mexico has been producing southwesterly flow and causing moderate vertical wind shear over Marty, the vertical integrity of the circulation has been maintained. So, instead of blowing the top off the circulation, the southwesterly winds have pushed the entire circulation toward the northeast. As Marty moved over water where the Sea Surface Temperature was near 30°C, it extracted enough energy from the water to intensify into a hurricane. The southwesterly winds inhibited upper level divergence on the western side of the circulation, but the upper level divergence east of Marty pumped out mass and the pressure decreased.
The environment is not favorable for much more intensification. The upper level trough is expected to continue to cause vertical wind shear. In addition, Marty is close enough to the coast of Mexico that the hurricane will begin to pull in some drier air from land. Marty could intensify a little more, but it is likely to weaken on Tuesday. If Marty makes landfall, it will weaken quickly.
The upper level trough is pushing Marty northeastward toward the coast of Mexico. Unless the shear blows the upper part of the circulation away from the lower portion, it will continue to move toward the coast. Marty could make landfall in 12 to 24 hours, which is why the government of Mexico issued warnings for the coast. Hurricane Marty could bring strong winds and locally heavy rainfall when it moves inland.