In Mexico, two people drowned in Cabo San Lucas, and another five died in the cities of Puerto Vallarta and Mazatlán.

A large cyclonic circulation was located within the eastern Pacific Ocean throughout early August.

Containing a low pressure area, it eventually became a tropical depression with 35 mph (55 km/h) winds at approximately 12:00 UTC on August 7, while roughly 300 miles west–southwest of Acapulco.

It proceeded to move west–northwest over the next day, and at 18:00 UTC on August 8, the depression strengthened further to a tropical storm.

[1] Wind shear around the storm decreased, aiding development, and by 06:00 UTC on August 10, Flossie strengthened into a hurricane.

Around this time, Flossie made its closest approach to land, being located around 75 miles (121 km) southwest of the Baja California Peninsula.

[12] Flossie brought hurricane-force wind gusts,[13] 0.75-inch (1.9 cm) hail,[14] and up to 4 inches (100 mm) of rain to Arizona.

[15] A total of eight people were injured in a five-car pileup on Interstate 19; fallen power poles blocked some portions of the highway, and a 6-mile (9.7 km) stretch had to be closed for several hours.

[19] A reservoir providing water to 50,000 people in Tucson was contaminated by the storm and had to be closed;[20] it resumed service 17 days later.

[25][26] Moisture from Flossie caused a flash flood warning to be issued in Cibola County, New Mexico.