The second named storm of the season, Boris developed from the interaction of a low-level trough and a Kelvin wave south of Mexico late on June 2.

About six hours later, Boris peaked with maximum sustained winds of 45 mph (75 km/h) – indicative of a weak tropical storm.

Later that day, Boris degenerated into a remnant low pressure, before fully dissipating over the Gulf of Tehuantepec on June 5.

As Boris approached land, tropical cyclone warnings and watches were issued, school classes were canceled, and evacuations occurred in Southwestern Mexico and portions of Guatemala.

In Mexico, overflowing streams left minor damage in Chiapas; four people were injured when a house partially collapsed.

[4] In conjunction with a ship observation and satellite intensity estimates, the disturbance acquired enough organization to be deemed a tropical depression at 2100 UTC on June 2.

[5] Over the subsequent hours after its formation, little change in organization was noted, with multiple low-level centers rotating within a broader circulation positioned on the south side of the deepest convection.

[9] Thereafter, the system degenerated into a trough of low pressure about 80 mi (130 km) east-northeast of Salina Cruz, Mexico.

[17] Boris and its precursor disturbance brought heavy precipitation to Guatemala, peaking at 9.27 in (235 mm) in Mazatenango, Suchitepéquez.