Hurricane Calvin (1993)

Hurricane Calvin was one of three Pacific hurricanes on record to make landfall along the Mexican coast during the month of July. The fourth tropical cyclone, third named storm, and second hurricane of the 1993 Pacific hurricane season, Calvin developed from an area of convection to the south of Mexico on July 4. The following day, the system intensified into a tropical storm, which was named Calvin. Continued strengthening ensued as Calvin curved from its initial westward track northward, and was upgraded to a hurricane on July 6 Calvin eventually turned northwest, and became a Category 2 hurricane on the Saffir–Simpson hurricane wind scale (SSHWS). By July 7, Hurricane Calvin made landfall near Manzanillo at peak strength. Calvin rapidly weakened after landfall, and was a tropical storm when it reemerged into the Pacific Ocean on early on July 8. Despite this, the hurricane did not reintensify, and continued to weaken as it headed rapidly northwestward. As Calvin made a second Mexican landfall near the southern tip of Baja California peninsula late on July 8, it weakened to a tropical depression. Early on July 9, the depression dissipated shortly after entering the Pacific Ocean for a third time.

Calvin was only the third July hurricane on record to make landfall on the west coast of Mexico. Throughout the nation of Mexico, Calvin dropped heavy rainfall, especially in the southwestern portion of the country. Heavy rainfall produced flooding, which, in turn, caused mudslides. In the wake of Calvin, 37 fatalities were reported. Most of the casualties were due to flooding or car accidents. In the state of Michoacán, 700 homes were destroyed. In addition, a storm surge was reported. Many boats and shoreline structures from Acapulco to Manzanillo were damaged. Heavy seas near Lázaro Cárdenas in western Mexico caused a ship, which contained sulfuric acid, to leak. The cleanup effort took one month to complete. In all, 30,000 people were displaced by the storm. Overall, Calvin caused $32 million (1993 US$) in damage.

Background

A trough steered Calvin northward to hit Mexico as a hurricane in the month of July, making Calvin one of only three Pacific hurricanes to strike the nation since HURDAT started keeping records during the 1949 Pacific hurricane season. The other ones were Hurricane Eugene in 1987 and the third storm in 1954.

Meteorological history

Hurricane Calvin originated from an area of disturbed weather, characterized with scattered deep convection, that developed south of the Gulf of Tehuantepec on the second day of July. Despite the lack of concentrated convection, the system was classified using the Dvorak technique, a tool used to measure a tropical cyclone's intensity. However, during the morning hours of July 4, banding features formed on the southern semicircle of the disturbance, and it is estimated that the system attained tropical depression status at 1200 UTC while centered approximately southeast of Acapulco. Initially, the storm was expected to stay offshore and attain winds of . Intensifying within a favorable atmospheric environment, the depression attained tropical storm status at 0000 UTC on July 5, receiving the name ''Calvin''.

A period of rapid intensification ensued shortly thereafter, and banding-type eye formed in association with Calvin later that day. By July 5, the National Hurricane Center (NHC) was predicting winds of . Later that day, the NHC reported winds of . Continuing to intensify, the system was upgraded to a hurricane at 0000 UTC on July 6 while becoming the second hurricane of the season, though operationally, it was believed to have become a hurricane three hours earlier. Upon becoming a hurricane, the NHC revised their forecast and was now expecting Calvin to become a Category 3 hurricane on the SSHWS. Around this time, Hurricane Calvin was embedded within the northeastern portion of a large, monsoon-like deep-layer-mean, which stretched from the Intertropical Convergence Zone to the southwest Mexican coastline. Furthermore, Calvin was a fairly large cyclone as surface winds of were reported over from the storm's center.

During the late morning hours of July 6, Calvin briefly slowed down before quickly accelerating to the northwest, bringing Calvin's gale-force winds south-southwest of Acapulco. Later that day, the NHC upgraded Calvin into a Category 2 hurricane. At 1200 UTC on July 7, Calvin reached its peak intensity of and a minimum barometric pressure of . Shortly thereafter, Calvin made landfall, approximately west-northwest of Manzanillo.
The storm quickly weakened over land, and by the evening, it had weakened into a tropical storm. After weakening greatly due to land interaction with the mountainous terrain of Mexico, Calvin reentered the Pacific at 0000 UTC on July 8. Although initially expected to turn west, this did not occur. Instead, Calvin continued northwest, accelerating while emerging into the Gulf of California. Calvin weakened to a tropical depression late on July 8 as it made a second landfall along the extreme southern Baja California peninsula. After crossing the coast, Tropical Depression Calvin dissipated the next day atop of cold sea surface temperatures.

Preparations

Prior to making landfall, a tropical storm warning and hurricane watch was issued for a portion of the Mexican coast on July 6. Six hours later, a hurricane warning was issued. By July 8, all hurricane warnings were discontinued. Six hours later, all hurricane watches were dropped. By 1800 UTC that day, all watches and warnings were dropped. In addition to the watches and warnings, flash floods and mudslides to occur. In Acapulco, hundreds of police and emergency workers were on stand by in advance of the storm. Meanwhile, the city's airport and ports were closed. Further south, in Oaxaca, the ports of Puerto Escondido, Puerto Ángel, Bahias de Huatulco, and Salina Cruz were closed. As a precautionary measure, the port of Zihuatanejo was also closed. In all, many sea ports were closed and airplane flights were canceled leaving many vacationers stranded. Multiple hotels were closed in the cities of Acapulco, Puerto Angel, and Huatulco. While weakening, the storm also threatened ports such as Mazatlán along the Gulf of California coast.

Impact

Due to the storm's large size, Hurricane Calvin was responsible for heavy flooding along much of the coast of Mexico, and after moving onshore as a hurricane, two locations (El Marques, Japala Del) reported as high as of rain. The flooding led to mudslides, killing 28 people on land, with 30,000 people displaced. Most of the casualties were indirect. In all, 37 people perished due to Hurricane Calvin. Nationwide 42,063 people were evacuated from their homes. Numerous seaside restaurants were washed off their respective foundations. Banana, mango, and corn plantations were also destroyed by the strong winds. Coconut trees were reportedly brought down as well.

In Puebla, a peasant died. Inland, 16 persons were killed in the states of Mexico and San Luis Potosí, where heavy rains caused mudslides across higher elevations. In the latter, 11 deaths were reported as two rivers had overflowed their banks while in the former, five people died. Moreover, six people riding in a taxi died in Veracruz during Calvin. Across Nayarit, Calvin brought heavy rains to the state. Later in its duration, Calvin struck the Baja California peninsula, though the storm had weakened considerably by that time Offshore, three ships containing 659 immigrants were intercepted by the storm, but the ship sustained no damage.

In all, the damage from Hurricane Calvin amounted to over 100 million new pesos, or $32 million (1993 USD). Despite the devastation, many vacationers did not alter their plans because of the hurricane.

Oaxaca

Prior to affecting Guerrero, Hurricane Calvin was responsible for heavy rains and widespread flooding across Oaxaca. An estimated 7,000 were left homeless along the Oaxacan coast and on the Isthmus of Tehuantepec. In addition, travel from the isthmus was cut off due to mudslides that blocked portions of the Pan-American Highway. Two rivers threatened to overflow their banks while the Benito, Juarez, and Yosocuta dams attained peak capacity and thus the gates were opened to prevent overflowing. A total of 42 communities were flooded. The cities of Tehuantepec, Salina Cruz, Juchtianm, and Tuxtepec were flooded due to extended periods of torrential rains. Across the state, the rains blocked highways and knocked out electrical, telephone, and water services. About 3,000 people took refuge to shelters and one person was killed.

Guerrero

In Acapulco, waves of moved through the city. In several states, between to inches of rain was recorded. However, in Las Pilas, the highest rainfall total was observed, at .

Prior to landfall, the storm's outer rainbands began to spread over the region, resulting in flooding. Throughout Acapulco, the storm uprooted 100 trees and caused some damage to roads. Although the city escaped significant damage, many huts were damaged and 1,600 people were left homeless. Citywide six people were killed while two other fisherman were missing. A mudslide killed a man and a son one person was reported dead after trying to save his boat from sinking. In addition, 13 boats sunk due to high waves, which impeded all maritime activity along the coast. In the city of Zihuatanejo, heavy rains flooded streets; consequently, "waist-deep" water was reported in some parts of the city. As a result, tourists were evacuated to higher ground. A total of 2,000 people were forced to abandon their homes. Two people sustained minor injuries when a tree was uprooted. Many neighborhoods throughout Acapulco were flooded. Overall, several beach communities were destroyed, almost 1,000 dwellings were destroyed, thousands of people were left homeless, and many areas remained without electricity.

Statewide, the majority of storm damage occurred over a stretch of road, which was situated about north of Acapulco. About a dozen small wood-built restaurants were swept away by high waves. At a nearby small beach resort, four cottages were damaged due to the winds and were later swept away. One two-story hotel was nearly destroyed as all that remained undamaged after the storm was a swimming pool. In a resort town situated northwest of the city, high waves pounded many small resorts.

Colima

Following Calvin's closest approach to Manzanillo, the Mexican Weather Service station in the city recorded a minimum barometric pressure of , as well as surface winds as the center of Calvin passed a little to the west. The Instituto Oceanografico del Pacifico in Manzanillo reported a minimum central pressure of in addition to gale

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