Caribbean and Central America The tropical wave from which Alex developed produced rainfall across the
Greater Antilles in the central Caribbean Sea. In nearby
San Juan de la Maguana, more than 500 homes were inundated. In neighboring
Haiti, minor flooding was reported in
Gonaïves. The
Jamaica Meteorological Service issued a flash flood warning for its entire island in response to the tropical wave producing thunderstorms across the nation. Fourteen people were killed in
Central America as a result of flooding related to Alex: six in
Nicaragua, six in
El Salvador, and two in
Guatemala. In El Salvador, the national chapter of the
Red Cross evacuated over 150 families from
La Paz and
Sonsonate departments. The El Salvador government reported nine injuries, and 5,000 people in the country evacuated their residences; the majority of the evacuees was temporarily relocated to 55 shelters. Alex inflicted damage to 349 homes, 31 schools and 10 bridges, and 27 highways were compromised or blocked. In Guatemala, 350 homes and eight highways were damaged, affecting 9,000 people; 2,000 sought shelter in the country. A landslide was reported in a village in
Santa Lucía Utatlán, along with flooding in
Flores. Corn, bean, and potato crops were damaged in
Suchitepéquez,
San Marcos and
Jutiapa departments. The National Emergency Management Organization of Belize reported that property damage in the country was minimal. The storm was expected to impact operations regarding the
Deepwater Horizon Oil Spill, with both containment and cleanup operations being affected by repercussions from the storm (such as wave action and wind direction). Although Alex stayed relatively away from the site, the storm caused
BP to delay plans to increase oil capture from the leak by a week.
Tarballs from the spill as large as apples washed onshore around
Grand Isle, as well as other parts of
Louisiana,
Alabama and Florida, from high
storm tides created by the hurricane.
Southern Mexico In
Chiapas, one person from Guatemala died and four others were injured when their bus rolled over as it traveled over a damaged highway. The state's civil defense system reported that 984 families from 17 municipalities were evacuated to shelters, and that Alex's torrential rainfall also produced 23 landslides in six counties of the state. In
Yucatán, a boat carrying seven passengers capsized; all were eventually rescued. In
Campeche, 937 dwellings suffered minor damage as a result of the storm.
Northeastern Mexico The storm's most significant effect in Northeastern Mexico was excessive rainfall, which was reported throughout the region. In Tamaulipas, between of precipitation were reported at weather stations statewide. in Arroyo Seco, in
San Pedro Garza García, a total of of precipitation was recorded between June 29 and on July 1. Other rainfall stations in Monterrey recorded between of rain, while Santa Catarina recorded of precipitation. The Comisión Nacional del Agua (CNA) noted that the storm rainfall totals greatly exceed the totals produced by
Hurricane Gilbert in 1988, which only produced of rain in the city. the dams were at 98%, 114%, and 124% of operating maximum capacity, respectively. Cuchillo Dam saw water inflows of . The water releases from these dams raised a state of alert in Tamaulipas, which was slated to receive the discharged water. In Coahuila, the rainfall caused La Frakcjhuto release of water into the
Rio Grande, and
Amistad Dam to reach 119% of normal operating capacity. In the case of the latter dam, the excess storage in Amistad Lake sparked fears of flooding in downstream municipalities, although the possibility of overtopping of the dam was discarded by the Mexican section of the
International Boundary and Water Commission. However, contingency plans were put in place to prepare for the crest of the Sabinas River, a tributary of the Rio Grande, and the subsequent crest on the Rio Grande itself, which was expected to carry at least At one point, the Rio Grande was clocked at due to its many flooded tributaries. The river's rise forced the evacuation of 40 families in
Piedras Negras, and required the closure of the
Gateway to the Americas International Bridge and
Colombia–Solidarity International Bridge between
Nuevo Laredo, Tamaulipas and
Laredo, Texas on July 8. The bridges were expected to be closed until at least July 10. The rise of the Escondido River forced the evacuation of 1,000 families in Villa de Fuente, as the river rose to carry through the town. The rest of the gates were unable to be opened due to lack of electrical power, sparking fears of a potential dam overtopping or rupture. The municipality of
Anáhuac in Nuevo León was evacuated after reports early on July 6 that the dam had overtopped; Anáhuac's
municipal president stated that the flood could cause the "total destruction" of the city. the town was reported to be underwater, with more discharge expected. Personnel from the
Mexican Army and the city's prison population were evacuated from Anáhuac that same day. In
San Luis Potosí, the rainfall from Alex was beneficial, as it caused increases in dam water levels of up to 20% in very dry areas. Throughout the state, 256,000 people were left without electricity. Heavy winds and rainfall knocked down billboards and trees in the capital, but no injuries were reported in the city. The storm dropped of rainfall in
Matamoros, flooding 120
colonias, and leaving six of the 120 underwater. The San Fernando River also breached its banks, flooding communities in
San Fernando and
Méndez. The overflow of the
Rio Grande following water discharges from Nuevo León isolated two communities in
Miguel Alemán. One death was reported in the state on July 7 when a man died while trying to cross a flooded river. Throughout the state, the storm and resultant floods damaged at least 6,000 homes, 202 schools, and 500 businesses. Additionally, 28 roadways and bridges were damaged, and left over 193,000 power consumers lost electric service.
Nuevo León ,
Nuevo León In
Nuevo León, fifteen people were confirmed to have died: one bricklayer who died after a housing unit under construction collapsed on top of him; two men and a woman who died after their vehicle rolled over and crashed into a
semi-trailer truck due to the intense rainfall; a 25-year-old who was swept away by swift currents and pinned against a fence; an elderly man who died after a wall toppled over him, a woman who died after a large boulder from a rock slide fell on her home, and a young man who fell onto the
Arroyo Topo Chico. Eight more bodies were found after floodwaters began receding, although one is believed to have been washed away from a cemetery. Twenty people in Nuevo León were reported missing. According to the
Comisión Federal de Electricidad, 4,000 customers lost electric power in the Monterrey metropolitan area, as did 61,000 people statewide. 18 wells lost power, leaving 110,000 without water service in the municipalities of
Santa Catarina and
García. Heavy flooding occurred along the Santa Catarina River in Monterrey, normally a dry river bed that flows into the
Rio Grande, causing it to reach a record flow of . a popular
flea market, and sport facilities built within a riverside
greenway. The Santa Catarina River also destroyed about of Monterrey's main arterial streets. In
San Nicolás de los Garza, the Arroyo Topo Chico exceeded its banks, forcing multiple street closures. An explosion and fire occurred on a bridge in the
Guadalupe municipality when a
transformer fell on an old gas pipe. No injuries were reported due to the fire. A bridge on the Pilón River collapsed in
Montemorelos, rupturing a 24-inch
oil pipeline in the process. However, the valves on both ends of the pipeline section were closed, minimizing the leak over the river, and the leak was not expected to adversely impact drinking water supplies in El Cuchillo Dam. Hurricane Alex affected the infrastructure of 1,077 schools in the state, 60 of which were severely damaged and 552 held intermediate damage. Nationwide disruption in Internet connection and cell phone services was caused by damage to optical fibers,
backbone nodes and telephonic central stations in Monterrey. Additionally,
Telefónica reported damage to its network in Monterrey and Saltillo, causing intermittent unavailability of telecommunication services. Preliminary estimates of the damage in the state rose to $10 billion (2010 MXN; US$762 million); final damage estimates released on August 5 totaled $16.9 billion (2010 MXN; US$1.35 billion) statewide.
Coahuila In
Coahuila, rainfall from Alex's remnants caused a small dam in an
ejido in
Castaños to
overtop, forcing the evacuation of 50 people in the municipality's seat. The ensuing flood rose and damaged 15 homes. The coal-producing region of the state was left isolated after the Álamos River broke its banks. Hundreds of residents in
Nueva Rosita and
Sabinas were evacuated; Some bridges on
Mexican Federal Highway 57 were covered in water. Thousands of citizens in
Ciudad Acuña were evacuated when the Arroyo Las Vacas flooded after of rain fell on nearby mountain ranges. The flood damaged 1,000 homes, damaging urban infrastructure, power, water and telecommunication services; 500 people sought refuge in shelters. The loss of power caused 40
maquiladoras to suspend their activities, stopping 16,000 workers. The rainfall caused damage in 15 municipalities of Coahuila, affecting 10,000 people, The feeder bands also produced heavy rainfall, leading to flooding on South Padre Island. A
storm surge of was reported on the island, causing moderate
beach erosion. However, more significant damage was avoided as the bulk of the
storm tide hit South Padre and
Port Isabel at low tide. Nine tornadoes were confirmed to have touched down in the state in association with the storm, one of which overturned a mobile home. Other tornadoes caused mainly minimal damages to trees and shrubbery. About 9,000 customers lost power throughout Texas. In
Houston, more rain fell on the first two days of July than the average rainfall for the entire month of July. Some parts of the city received nearly of rain over three days, causing scattered street flooding. Flooding caused by the rainfall from the remnants of Alex caused the
Rio Grande at Foster Ranch, in far western Texas, to exceed , well above the flood stage at and the record stage at . Combined with the rainfall produced by
Tropical Depression Two, the Rio Grande was under flood conditions for much of the month of July. About $10 million (2010 USD) of agricultural damage was reported in
Hidalgo County from Alex. ==Aftermath and records==