Former Tropical Depression One-E strengthened to Tropical Storm Andres southwest of Mexico on Sunday morning. At 11:00 a.m. EDT on Sunday the center of Tropical Storm Andres was located at latitude 14.1°N and longitude 107.9°W which put it about 620 miles (1000 km) south-southeast of the southern tip of Baja California. Andres was moving toward the northwest at 6 m.p.h. (10 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1005 mb.

The circulation around former Tropical Depression One-E strengthened on Sunday morning and the National Hurricane Center designated the system as Tropical Storm Andres. The circulation around Andres was exhibiting more organization. Storms near the center of the circulation generated upper level divergence that pumped mass away from the tropical storm. Bands of showers and thunderstorms were revolving around the center of Andres. The strongest rainbands were in the eastern half of the circulation. Winds to tropical storm force extended out 70 miles (110 km) in the northeastern quadrant of Tropical Storm Andres. The winds in the other parts of the circulation were blowing at less than tropical storm force.

Tropical Storm Andres will move through an environment favorable for intensification during the next 24 hours. Andres will move over water where the Sea Surface Temperatures will be near 28°C. It will move under the center of an upper level ridge southwest of Mexico. The winds are weak near the center of the ridge and there will be little vertical wind shear. Tropical Storm Andres could strengthen during the next 24 hours. An upper level trough over the Eastern North Pacific Ocean will approach Andres from the west on Monday. The trough will produce southwesterly winds which will blow toward the top of the tropical storm. Those winds will cause the vertical wind shear to increase. More wind shear will cause Tropical Storm Andres to weaken early next week.

Tropical Storm Andres will move around the southwestern part of a subtropical high pressure system over the Gulf of Mexico and Mexico. The high will steer Andres toward the northwest on Sunday. Tropical Storm Andres will move southeast of a large high pressure system over the Eastern North Pacific Ocean during the early part of next week. That high pressure system will steer Andres toward the west. On its anticipated track Tropical Storm Andres will remain south of Baja California.