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|Tropical Storm (SSHWS/NWS)|
|Formed||August 4, 2018|
|Dissipated||August 7, 2018|
|Highest winds||1-minute sustained: 65 mph (100 km/h) |
|Lowest pressure||998 mbar (hPa); 29.47 inHg|
|Damage||≥ $737,000 (2018 USD)|
|Areas affected||Western Mexico|
|Part of the 2018 Pacific hurricane season|
Tropical Storm Ileana was a tropical cyclone that affected Western Mexico, causing multiple deaths and flooding. The ninth named storm of the 2018 Pacific hurricane season, Ileana originated from a tropical wave that the National Hurricane Center began monitoring on July 26 as it left the west coast of Africa. The wave travelled across the Atlantic Ocean with no thunderstorm activity, before crossing into the Eastern Pacific Ocean on August 4. The disturbance quickly and unexpectedly organized into a tropical depression later in the day. Initially, the depression was well defined, but it soon degraded due to unfavorable conditions. It began to strengthen on August 5, becoming Tropical Storm Ileana. On August 6, Ileana peaked with winds of 65 mph (100 km/h) and a pressure of 998 mbar (29.47 inHg). Ileana began to develop an eyewall structure soon after, but became intertwined with nearby Hurricane John. John disrupted Ileana and ultimately absorbed it on August 7.
Ileana prompted the issuance of multiple watches and warnings along the coast of Baja California Sur and Western Mexico. Ileana caused a total of four deaths in Guerrero, with two occurring in Chilpancingo and the remainder in Acapulco. Additionally, Ileana caused flooding in the Mexican states of Oaxaca, Guerrero, and Mexico.
The origins of Ileana can be traced back to a tropical wave that the National Hurricane Center (NHC) began monitoring on July 26 as it departed from the west coast of Africa. The wave had virtually no convection as it crossed over the Atlantic. Once the wave entered the Eastern Pacific Ocean early on August 4, thunderstorm and convective activity rapidly increased. At 17:00 UTC, the NHC raised its development chances to 50% after satellite imagery indicated an area of low pressure had formed a few hundred miles south of the Gulf of Tehuantepec and was showing signs of organization. At 18:00 UTC, the system was designated as a tropical depression. Around that time, the NHC noted the depression had a well defined low pressure center and a distinct, curved band of deep convection. Six hours later, the structure of the depression had degraded due to wind shear from the north. The low-level center had become exposed in the northwest and convection in the east and south had decreased. Despite the disruptive wind shear, the depression then began to strengthen, reaching tropical storm status on August 5, afterwhich it was assigned the name Ileana. At that time, Ileana had a fairly symmetrical shape and a central dense overcast-like feature had developed over the system.
Ileana continued to strengthen over the next day after entering an area with sea surface temperatures of 30 to 31 °C (86 to 88 °F). On August 6 at 12:00 UTC, Ileana reached peak intensity with maximum sustained winds of 65 mph (100 km/h) and a minimum central pressure of 998 mbar (29.47 inHg). Around the same time, the NHC reported that Ileana had strong deep convection with cloud temperatures of −85 to −90 °C (−121 to −130 °F). Additionally, a banded eye feature had developed within the central dense overcast. Soon after, microwave imagery and Acapulco radar showed the emergence of an eyewall structure at the mid-levels of the system. By 21:00 UTC, Ileana was becoming increasingly intertwined in the outer bands of Hurricane John to the west as the two systems began to experience the Fujiwhara effect. At 12:00 UTC on August 7, Ileana was completely absorbed by John.
As a precautionary measure, the Government of Mexico issued a Tropical Storm Watch for the coast of Mexico from Lazaro Cardenas to Cabo Corrientes on August 5 at 22:40 UTC. At 03:00 UTC, the watch was upgraded to a Tropical Storm Warning. Six hours later, the Government of Mexico issued a Hurricane Watch for Punta San Telmo to Playa Perula and a Tropical Storm Watch was also issued for the southern tip of Baja California Sur from Los Barilles to Todo Santos. At 12:00 UTC, the Tropical Storm Warning was extended eastward to include Lazaro Cardenas to Tecpan de Galeana. All watches and warnings were gradually discontinued after Ileana was no longer forecast to strengthen.
In the Mexican state of Guerrero, Ileana caused a total of four deaths. On August 5, the body of 35-year-old man was discovered in the Huacapa River in Chilpancingo. The man had reportedly been pushing a car when a strong current pulled him down to the river where he drowned. Additionally, an 8-year-old and a 15-year-old fell into the Laguna de Tres Palos in Acapulco and drowned after their fishing boat capsized. There, multiple power outages occurred due to a fallen tree. A peak rainfall total of 3.54 inches (90 mm) was recorded at the Acapulco International Airport. The lowest rainfall total in the area, 0.46 inches (11.75 mm), was recorded at Renacimiento. In the municipality of Coyuca de Benítez, at least 20 homes were inundated and numerous streets were flooded. Rip currents along the coast of Chilpancingo resulted in the death of a tourist at La Condesa beach. He was rescued by lifeguards, but later died despite receiving medical treatment. In the municipality of Santiago Choapam in Oaxaca, heavy rains from Ileana caused a landslide that left a house buried. While in the Mexican state of Chiapas, Ileana caused another four deaths. In Jiquipilas on August 6, a car containing 18 individuals was dragged away by the current while attempting to cross a flooded bridge. Three children and one adult were later found dead. In Michoacán, the state required MX$13.6 million (US$737,000) to repair the road and highway.
In the state of Mexico, heavy rains from Ileana caused severe flooding. The Anillo Periférico and several other roads in Mexico City experienced flooding. As a result of the rains, the Mexico City Metro (STC) implemented safety measures for several of its lines. The San Jerónimo Canal overflowed in the El Rosal neighborhood in Magdalena Contreras. Additionally, two trees fell and total of 33 structures were inundated throughout Mexico City. In the Huixquilucan municipality, a sewage pipe overflowed and two homes were flooded.
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