In anticipation of Diana's first landfall, a tropical storm warning was issued on August 5 for Cancún, Mexico, southward to Belize City, Belize, on August 5, including the offshore islands from both nations; a tropical storm warning indicates that tropical storm force winds, , are expected within 24 hours. Eleven hours later, the tropical storm warning was extended as far as Carmen, but was discontinued for the entire east coast of Belize. Civil defense officials in Quintana Roo recommended that residents in coastal areas and in homes with weak construction to evacuate. The civil defense also set up emergency shelters in Punta Allen, Punta Herrero, and Xcalak. The Mexican Coast Guard was placed on alert and shipping activity around Quintana Roo ceased during the evening of August 5, as tides were expected to range from above normal. Additionally, officials expressed concerns about flash flooding due to the possibility of of rainfall in areas near the storm's path. After Diana made landfall on the Yucatán Peninsula on August 6, all of the tropical storm warnings in place were discontinued. Diana then threatened the mainland east coast of Mexico. A hurricane watch was issued for Tuxpan to Boca de Jesus Maria at 21:00 UTC on August 6; a hurricane watch notes the possibility of hurricane conditions within 48 hours, such as winds of at least . Early on August 7, the National Hurricane Center anticipated hurricane conditions within 24 hours, and as a result, a hurricane warning was issued for Nautla to Le Pesca. Simultaneously, a tropical storm warning was issued for La Pesca to Boca de Jesus Maria. Later that day, a hurricane warning had been issued for a similar area, stretching from Nautla to Lerdo de Tejada. The National Hurricane Center also predicted precipitation totals of and emphasized that flash floods and mudslides would likely occurred in the vicinity of where Diana was projected to make landfall. According to Miguelangel Rebolledo, the captain of the port of Tuxpan, about 300 people fled low-lying areas. State and federal officials prepared 10,000 packages of emergency supplies, food, and medicine and moved them to several locations along the coast. Police and Armed Forces were placed on alert. By 00:00 UTC on August 8, all of the watches and warnings in place were officially discontinued. Impact Mexico Offshore Quintana Roo, the island of Cozumel reported sustained winds of . While crossing over the Yucatán