On June 14, satellite imagery revealed an increase in thunderstorm activity to the south of the Gulf of Tehuanpec. Moving little, a broad surface low developed with the cloud mass, and a tropical wave moved through the area. Although the disturbance remained disorganized, a second tropical wave moved into the region on June 18, when the cloudiness there became better concentrated. According to a post-storm analysis of satellite data and synoptic reports, it is noted that a tropical depression formed at 0600 UTC on June 18, while located approximately south-southeast of Huatulco, Mexico. Quickly strengthening, the depression intensified a tropical storm six hours later based on a ship report, earning the name Beatriz. Moving generally towards the northwest, partially due to Tropical Storm Arlene's large circulation in the Gulf of Mexico, Beatriz reached a peak intensity of by 1800 UTC on June 19. Shortly thereafter, the system made landfall near Puerto Escondido, Oaxaca and rapidly weakened to a tropical depression over the mountainous terrain of Mexico. Beatriz dissipated at 0600 UTC on June 20, although the remnant cloudiness and associated convection from the storm spread across portions of the western Gulf of Mexico that same day. Beatriz caused extensive damage in southwest Mexico, especially from heavy rains and flooding, with highest rainfall totals of between five and ten inches occurring in Oaxaca, with even higher totals of 11.97 in (304 mm) and 15.46 in (393 mm) from Las Pilas and Salina Cruz. Six deaths were reported in the Mexican states of Morelos and Veracruz from flooding and downed trees attributed to Beatriz.