Tropical Storm Darby formed over the Eastern North Pacific Ocean south of Baja California on Saturday. At 11:00 p.m. EDT on Saturday the center of Tropical Storm Darby was located at latitude 14.3°N and longitude 114.9°W which put it about 680 miles (1090 km) south-southwest of the southern tip of Baja California. Darby was moving toward the west at 17 m.p.h. (28 km/h). The maximum sustained wind speed was 45 m.p.h. (75 km/h) and and there were wind gusts to 60 m.p.h. (95 km/h). The minimum surface pressure was 1004 mb.

A well defined low pressure system formed in a tropical wave located south of Baja California on Saturday and the National Hurricane Center designated the system as Tropical Storm Darby. A small, well defined center of circulation was evident on visible and infrared satellite images. Bands of showers and thunderstorms were revolving around the center of Darby. Storms near the center generated upper level divergence that pumped mass away from the tropical storm. Winds to tropical storm force extended out 35 miles (55 km) from the center of circulation.

Tropical Storm Darby will move through an environment favorable for intensification during the next 48 hours. Darby will move over water where the Sea Surface Temperatures are near 28˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Tropical Storm Darby will intensify during the 48 hours and it could strengthen to a hurricane.

Tropical Storm Darby will move around the southern side of a high pressure system over the Eastern North Pacific Ocean. The high pressure system will steer Darby toward the west during the next 48 hours. On its anticipated track Tropical Storm Darby will move farther away from Baja California.

Elsewhere over the Eastern North Pacific Ocean, the National Hurricane Center designated former Tropical Storm Bonnie as a Post Tropical Cyclone. At 5:00 p.m. EDT on Saturday the center of former Tropical Storm Bonnie was located at latitude 19.5°N and longitude 129.4°W which put it about 1275 miles (2055 km) west of the southern tip of Baja California. Bonnie was moving toward the west at 21 m.p.h. (33 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1009 mb.