A tropical wave entered the eastern Pacific Ocean on July 17.
Two days later, the wave spawned a low pressure area while located several hundred miles south-southeast of the Gulf of Tehuantepec.
The National Hurricane Center began issuing Tropical Weather Outlooks (TWOs) and initially noting that slow development was possible within the next 48 hours.
Convective activity increased and Dvorak satellite classifications began early on July 21.
Another TWO issued later that day indicated that the circulation was becoming better-defined.
After additional development, it is estimated that Tropical Depression Seven-E formed at 0000 UTC on July 22, while about 460 miles (740 km) south of Manzanillo, Colima.
A strong upper-level high pressure area generated moderate shear, though the National Hurricane Center noted that it would not interfere with intensification.
However, the depression initially failed to strengthen significantly.
It remained disorganized, with the circulation elongated northeastward to southwestward and deep convection displaced to the west.
Early on July 23, a burst of deep convection occurred southwest of the center of circulation, while satellite imagery indicated that development of banding features.

Until late on July 23, it was predicted that the depression would strengthen significantly and peak with winds of 70 mph (110 km/h), just slightly under hurricane intensity.
Finally, the depression strengthened into Tropical Storm Dalila by 0000 UTC on July 24.
Due to an anticipated decrease in wind shear, Dalila was again predicted to peak with winds of 70 mph (110 km/h) early on July 26.
However, at 0000 UTC on July 25, Dalila attained its peak intensity with maximum sustained winds of 60 mph (95 km/h) and a minimum barometric pressure of 995 mbar (29.4 inHg).
Shortly thereafter, it passed over or very close to Socorro Island.
Later on July 25, Dalila curved west-northwestward and began entering a region of colder sea surface temperatures, resulting in weakening as the cloud pattern became less organized.
Due to the quick deterioration of the storm, the National Hurricane Center noted that, "Dalila is winding down faster than anticipated".
Early on July 27, it weakened to a tropical depression.
Later that day, the storm became devoid of deep convection for over 12 hours.
As a result, the National Hurricane Center ceased advisories on Dalila late on July 27, since it degenerated into a remnant low pressure area while located about 460 miles (740 km) west of the southern tip of Baja California.
The remnant low moved west-northwestward during the next few days and then curved west-southwestward on July 29.
It drifted southward on July 30 and dissipated about 700 miles (1,100 km) west of the southern tip of Baja California later that day.
A tropical wave entered the eastern Pacific Ocean on July 17. Two days later, the wave spawned a low pressure area while located several hundred miles south-southeast of the Gulf of Tehuantepec. The National Hurricane Center began issuing Tropical Weather Outlooks (TWOs) and initially noting that slow development was possible within the next 48 hours. Convective activity increased and Dvorak satellite classifications began early on July 21. Another TWO issued later that day indicated that the circulation was becoming better-defined. After additional development, it is estimated that Tropical Depression Seven-E formed at 0000 UTC on July 22, while about 460 miles (740 km) south of Manzanillo, Colima. A strong upper-level high pressure area generated moderate shear, though the National Hurricane Center noted that it would not interfere with intensification. However, the depression initially failed to strengthen significantly. It remained disorganized, with the circulation elongated northeastward to southwestward and deep convection displaced to the west. Early on July 23, a burst of deep convection occurred southwest of the center of circulation, while satellite imagery indicated that development of banding features.
Until late on July 23, it was predicted that the depression would strengthen significantly and peak with winds of 70 mph (110 km/h), just slightly under hurricane intensity. Finally, the depression strengthened into Tropical Storm Dalila by 0000 UTC on July 24. Due to an anticipated decrease in wind shear, Dalila was again predicted to peak with winds of 70 mph (110 km/h) early on July 26. However, at 0000 UTC on July 25, Dalila attained its peak intensity with maximum sustained winds of 60 mph (95 km/h) and a minimum barometric pressure of 995 mbar (29.4 inHg). Shortly thereafter, it passed over or very close to Socorro Island. Later on July 25, Dalila curved west-northwestward and began entering a region of colder sea surface temperatures, resulting in weakening as the cloud pattern became less organized. Due to the quick deterioration of the storm, the National Hurricane Center noted that, "Dalila is winding down faster than anticipated". Early on July 27, it weakened to a tropical depression. Later that day, the storm became devoid of deep convection for over 12 hours. As a result, the National Hurricane Center ceased advisories on Dalila late on July 27, since it degenerated into a remnant low pressure area while located about 460 miles (740 km) west of the southern tip of Baja California. The remnant low moved west-northwestward during the next few days and then curved west-southwestward on July 29. It drifted southward on July 30 and dissipated about 700 miles (1,100 km) west of the southern tip of Baja California later that day.
Tropical Storm Dalila (2007)