Hurricane Diana was a deadly tropical cyclone which struck Mexico in August 1990. The fourth named storm and second hurricane of the season, Diana developed from a tropical wave in the southwestern Caribbean on August 4. Forming as a tropical depression, the system brushed Honduras before intensifying into a tropical storm the following day. Continuing to gradually strengthen, Diana made its first landfall in Mexico's Yucatán Peninsula as a strong tropical storm late on August 5. The cyclone weakened slightly due to land interaction, before emerging into the Bay of Campeche on August 6. Once over water, warm sea surface temperatures allowed Diana to quickly become a hurricane and later peak as a Category 2 on the Saffir–Simpson hurricane scale on August 7. Shortly thereafter, the storm made landfall near Tampico, Tamaulipas, with winds of . Rapid weakening ensued once the storm moved over the high terrain of Mexico, with Diana diminishing to a tropical depression roughly 24 hours after moving onshore. The cyclone later emerged into the Gulf of California on August 9 shortly before dissipating. The remnant disturbance was monitored until losing its identity over Arizona on August 14. Diana left relatively minor impacts in the Yucatán Peninsula. Some locations observed tropical storm-force sustained winds and gusts, while heavy rains left street flooding in the Chetumal area. Along the Gulf Coast of Mexico, the hurricane produced torrential rains exceeding in some places. The ensuing floods left about 3,500 people homeless and destroyed roughly of farmland. Numerous roads and railways were either washed out or blocked by debris, cutting communication with several communities. In all, Diana killed 139 people in Mexico and resulted in approximately $90.7 million (1990 USD) in damage. The remnant disturbance caused street flooding in Arizona. Meteorological history Hurricane Diana originated from a tropical wave which emerged into the Atlantic Ocean from the west coast of Africa on July 27. Unfavorable conditions initially prohibited tropical cyclogenesis, with the wave remaining disorganized until reaching the eastern Caribbean Sea. The system entered the Caribbean Sea through the southern Windward Islands, where barometric pressures fell slightly, decreasing by 3.5 mbar (hPa; 0.1 inHg) in 24 hours. Upper-level air data from the Lesser Antilles indicated that the tropical wave was associated with an upper-level anticyclone. The first reconnaissance aircraft flight into the wave indicated no low-level circulation, but a relatively large and increasing amount of thunderstorm activity. The system continued