Tropical Storm Agatha (2010)
Encyclopedia
Tropical Storm Agatha was a weak, but catastrophic tropical cyclone
Tropical cyclone
A tropical cyclone is a storm system characterized by a large low-pressure center and numerous thunderstorms that produce strong winds and heavy rain. Tropical cyclones strengthen when water evaporated from the ocean is released as the saturated air rises, resulting in condensation of water vapor...

 that brought widespread floods to much of Central America
Central America
Central America is the central geographic region of the Americas. It is the southernmost, isthmian portion of the North American continent, which connects with South America on the southeast. When considered part of the unified continental model, it is considered a subcontinent...

 and was the deadliest tropical cyclone in the eastern Pacific since Hurricane Pauline
Hurricane Pauline
Hurricane Pauline was one of the strongest and deadliest Pacific hurricanes to make landfall on Mexico. The sixteenth tropical storm, eighth hurricane, and seventh major hurricane of the 1997 Pacific hurricane season, Pauline developed out of a tropical wave on October 5 about 250 miles ...

 in 1997
1997 Pacific hurricane season
The 1997 Pacific hurricane season was a very active hurricane season. With hundreds of deaths and billions of dollars in damage, this season was the costliest and one of the deadliest Pacific hurricane seasons. This was due to a strong El Niño...

. The first storm of the 2010 Pacific hurricane season
2010 Pacific hurricane season
The 2010 Pacific hurricane season was the least active Pacific hurricane season, in terms of the number of named storms and hurricanes, on record, due to a moderate La Niña, unlike the 2010 Atlantic hurricane season, which was one of the most active on record...

, Agatha originated from the Intertropical Convergence Zone
Intertropical Convergence Zone
The Intertropical Convergence Zone , known by sailors as The Doldrums, is the area encircling the earth near the equator where winds originating in the northern and southern hemispheres come together....

, which is a region of thunderstorms across the tropics. It developed into a tropical depression on May 29 and tropical storm later, it was dissipated on May 30, reaching top winds of 45 mph ( and a lowest pressure of 1000 mbar
Bar (unit)
The bar is a unit of pressure equal to 100 kilopascals, and roughly equal to the atmospheric pressure on Earth at sea level. Other units derived from the bar are the megabar , kilobar , decibar , centibar , and millibar...

 (hPa
Pascal (unit)
The pascal is the SI derived unit of pressure, internal pressure, stress, Young's modulus and tensile strength, named after the French mathematician, physicist, inventor, writer, and philosopher Blaise Pascal. It is a measure of force per unit area, defined as one newton per square metre...

; 29.53 inHg
Inch of mercury
Inches of mercury, ' is a unit of measurement for pressure. It is still widely used for barometric pressure in weather reports, refrigeration and aviation in the United States, but is seldom used elsewhere....

). It made landfall near the Guatemala–Mexico border
Guatemala–Mexico border
The Guatemala–Mexico border is the international border between Guatemala and Mexico. It measures and runs between north and west Guatemala and the Mexican states of Quintana Roo, Campeche, Tabasco and Chiapas...

 on the evening of May 29. Agatha produced torrential rain all across Central America
Central America
Central America is the central geographic region of the Americas. It is the southernmost, isthmian portion of the North American continent, which connects with South America on the southeast. When considered part of the unified continental model, it is considered a subcontinent...

, which resulted in the death of one person in Nicaragua. In Guatemala, 152 people were killed and 100 left missing by landslides. 13 deaths also occurred in El Salvador. It soon dissipated over Guatemala
Guatemala
Guatemala is a country in Central America bordered by Mexico to the north and west, the Pacific Ocean to the southwest, Belize to the northeast, the Caribbean to the east, and Honduras and El Salvador to the southeast...

. As of June 15, officials in Guatemala have stated that 165 people were killed and 113 others are missing.

In all, Agatha caused 190 fatalities, and roughly $1.1 billion in damage throughout Central America.

Meteorological history

Tropical Storm Agatha originated from an area of convection, or thunderstorms, that developed on May 24, off the west coast of Costa Rica
Costa Rica
Costa Rica , officially the Republic of Costa Rica is a multilingual, multiethnic and multicultural country in Central America, bordered by Nicaragua to the north, Panama to the southeast, the Pacific Ocean to the west and the Caribbean Sea to the east....

. At the time, there was a trough
Trough (meteorology)
A trough is an elongated region of relatively low atmospheric pressure, often associated with fronts.Unlike fronts, there is not a universal symbol for a trough on a weather chart. The weather charts in some countries or regions mark troughs by a line. In the United States, a trough may be marked...

 in the region that extended into the southwestern Caribbean Sea
Caribbean Sea
The Caribbean Sea is a sea of the Atlantic Ocean located in the tropics of the Western hemisphere. It is bounded by Mexico and Central America to the west and southwest, to the north by the Greater Antilles, and to the east by the Lesser Antilles....

, associated with the Intertropical Convergence Zone
Intertropical Convergence Zone
The Intertropical Convergence Zone , known by sailors as The Doldrums, is the area encircling the earth near the equator where winds originating in the northern and southern hemispheres come together....

. The system drifted northwestward, and conditions favored further development
Tropical cyclogenesis
Tropical cyclogenesis is the term that describes the development and strengthening of a tropical cyclone in the atmosphere. The mechanisms through which tropical cyclogenesis occurs are distinctly different from those through which mid-latitude cyclogenesis occurs...

. On May 25, the convection became more concentrated, and the National Hurricane Center
National Hurricane Center
The National Hurricane Center , located at Florida International University in Miami, Florida, is the division of the National Weather Service responsible for tracking and predicting weather systems within the tropics between the Prime Meridian and the 140th meridian west poleward to the 30th...

 (NHC) noted the potential for a tropical depression to develop. The next day, it briefly became disorganized, as its circulation
Atmospheric circulation
Atmospheric circulation is the large-scale movement of air, and the means by which thermal energy is distributed on the surface of the Earth....

 was broad and elongated; however, the disturbance was in a very moist environment, and multiple low level centers gradually organized into one. The low continued to get better organized; however, there was a lack of a well-defined circulation. On May 29, after further organization of the circulation and convection, the NHC initiated advisories on Tropical Depression One-E while the system was located about 295 miles (475 km) west of San Salvador
San Salvador
The city of San Salvador the capital and largest city of El Salvador, which has been designated a Gamma World City. Its complete name is La Ciudad de Gran San Salvador...

, El Salvador
El Salvador
El Salvador or simply Salvador is the smallest and the most densely populated country in Central America. The country's capital city and largest city is San Salvador; Santa Ana and San Miguel are also important cultural and commercial centers in the country and in all of Central America...

.

Upon becoming a tropical cyclone
Tropical cyclone
A tropical cyclone is a storm system characterized by a large low-pressure center and numerous thunderstorms that produce strong winds and heavy rain. Tropical cyclones strengthen when water evaporated from the ocean is released as the saturated air rises, resulting in condensation of water vapor...

, the system was located in an environment with little wind shear
Wind shear
Wind shear, sometimes referred to as windshear or wind gradient, is a difference in wind speed and direction over a relatively short distance in the atmosphere...

 and waters of 30 °C
Celsius
Celsius is a scale and unit of measurement for temperature. It is named after the Swedish astronomer Anders Celsius , who developed a similar temperature scale two years before his death...

 (86 °F
Fahrenheit
Fahrenheit is the temperature scale proposed in 1724 by, and named after, the German physicist Daniel Gabriel Fahrenheit . Within this scale, the freezing of water into ice is defined at 32 degrees, while the boiling point of water is defined to be 212 degrees...

). As such, it was expected to strengthen, although the mountainous terrain of the Central American coastline limited significant intensification. The depression moved slowly northeastward around the western periphery of a ridge
Ridge (meteorology)
A ridge is an elongated region of relatively high atmospheric pressure, the opposite of a trough....

 located over northern South America. Several hours later, satellites monitoring the system discovered tropical storm-force winds, prompting the NHC to upgrade the depression to Tropical Storm Agatha. Around this time, it was noted that there was a 40% chance of the system undergoing rapid intensification
Rapid deepening
Rapid deepening, also known as rapid intensification, is a meteorological condition that occurs when the minimum sea-level atmospheric pressure of a tropical cyclone decreases drastically in a short period of time. The National Weather Service describes rapid deepening as a decrease of...

 within the following 24 hours as the only limiting factor was its proximity to land. However, the storm failed to intensify much, peaking in intensity with winds of 45 mph (75 km/h) and a barometric pressure of 1000 mbar (hPa; 29.53 inHg). Within two hours of reaching this strength, Agatha abruptly relocated northward and made landfall
Landfall (meteorology)
Landfall is the event of a tropical cyclone or a waterspout coming onto land after being over water. When a waterspout makes landfall it is reclassified as a tornado, which can then cause damage inland...

 near the Guatemala-Mexico border.

After landfall, Agatha continued to cause floods and landslides, however it did not bring a lot of tropical storm force winds on shore. The system weakened quickly after coming on shore, dropping its winds to (20 knots, and its pressure to (hPa
Pascal (unit)
The pascal is the SI derived unit of pressure, internal pressure, stress, Young's modulus and tensile strength, named after the French mathematician, physicist, inventor, writer, and philosopher Blaise Pascal. It is a measure of force per unit area, defined as one newton per square metre...

; ) before dissipating. A burst of convection re-emerged east of Belize
Belize
Belize is a constitutional monarchy and the northernmost country in Central America. Belize has a diverse society, comprising many cultures and languages. Even though Kriol and Spanish are spoken among the population, Belize is the only country in Central America where English is the official...

, in the Atlantic basin, on May 31. On June 1, the National Hurricane Center stated that the remnants of Tropical Storm Agatha had only a low chance of regeneration in the western Caribbean Sea. By the next day, the thunderstorm activity associated with Agatha in the western Caribbean had dissipated. However, the remnans of Tropical Storm Agatha persisted until June 6, causing death and destruction over Central America. On June 6, the remnants of Tropical Storm Agatha dissipated completely, after ravaging the Honduras
Honduras
Honduras is a republic in Central America. It was previously known as Spanish Honduras to differentiate it from British Honduras, which became the modern-day state of Belize...

 and El Salvador
El Salvador
El Salvador or simply Salvador is the smallest and the most densely populated country in Central America. The country's capital city and largest city is San Salvador; Santa Ana and San Miguel are also important cultural and commercial centers in the country and in all of Central America...

.

Preparations

As a developing tropical disturbance, the system produced heavy rainfall for several days along the Pacific coastline from Nicaragua
Nicaragua
Nicaragua is the largest country in the Central American American isthmus, bordered by Honduras to the north and Costa Rica to the south. The country is situated between 11 and 14 degrees north of the Equator in the Northern Hemisphere, which places it entirely within the tropics. The Pacific Ocean...

 to the Gulf of Tehuantepec
Gulf of Tehuantepec
Gulf of Tehuantepec is a large body of water on the Pacific coast of the Isthmus of Tehuantepec, southeastern Mexico, at . Most of the hurricanes that form in the Eastern Pacific organize in or near this body of water...

, with the possibility of life-threatening flash floods and mudslides. Upon becoming a tropical cyclone, a tropical storm warning
Tropical cyclone warnings and watches
Warnings and watches are two levels of alert issued by national weather forecasting bodies to coastal areas threatened by the imminent approach of a tropical cyclone of tropical storm or hurricane intensity. They are notices to the local population and civil authorities to make appropriate...

 was issued for the coast of El Salvador and Guatemala. In addition, Agatha was noted to have the potential for 250 to 500 mm (9.8 to 19.7 in) of rain in. Officials in Guatemala expected flooding from the storm to be more severe than the flooding that killed nine people a week before Agatha. Further north in Mexico, meteorologists predicted that Agatha would produce up to 100 mm (3.9 in) of rain in the southern states. Throughout El Salvador and Nicaragua, emergency officials evacuated about 2,000 residents due to the threat of flash flooding. In response to the approaching storm, a yellow alert was declared for all of El Salvador and it was estimated that roughly 89% of the country was at risk from flooding. Roughly 52,000 police, emergency rescue personnel and soldiers were placed on standby by the Dirección General de Protección Civil
Sistema Nacional de Protección Civil, Prevención y Mitigación de Desastres
The National Civil Defence System for Disaster Prevention and Mitigation of El Salvador , commonly known as "Protección Civil", is an entity created to prevent disasters or reduce their impact on society, and coordinate disaster relief efforts.The Salvadoran Civil Defence System is part of a Central...

.

Impact

Impact by country
Country Fatalities Damage (USD)
El Salvador
El Salvador
El Salvador or simply Salvador is the smallest and the most densely populated country in Central America. The country's capital city and largest city is San Salvador; Santa Ana and San Miguel are also important cultural and commercial centers in the country and in all of Central America...

12 $112.1 million
Guatemala
Guatemala
Guatemala is a country in Central America bordered by Mexico to the north and west, the Pacific Ocean to the southwest, Belize to the northeast, the Caribbean to the east, and Honduras and El Salvador to the southeast...

160 $982 million
Honduras
Honduras
Honduras is a republic in Central America. It was previously known as Spanish Honduras to differentiate it from British Honduras, which became the modern-day state of Belize...

18 Unknown
Mexico
Mexico
The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

0 Minimal
Total 190 ~$1.1 billion

Nicaragua

Prior to becoming a tropical depression, the system produced torrential rainfall in Nicaragua, resulting in the death of one person after she was swept away by a swollen river. Many homes and bridges were destroyed across the country. In Estelí Department, the Nicaraguan Air Force
Nicaraguan Air Force
The Nicaraguan Air Force continues the former Sandinista air units. Before 1979 the Nicaraguan National Guard had some air units .-Air force:...

 had to rescue 24 people trapped in their homes.

Guatemala

Two days before landfall, on May 27 the Pacaya
Pacaya
Pacaya is an active complex volcano in Guatemala, which first erupted approximately 23,000 years ago and has erupted at least 23 times since the Spanish conquest of Guatemala. Pacaya rises to an elevation of . After being dormant for a century, it erupted violently in 1965 and has been...

 volcano, roughly 25 mi (40.2 km) south of Guatemala City
Guatemala City
Guatemala City , is the capital and largest city of the Republic of Guatemala and Central America...

, erupted, killing one person and forcing over 2,000 people to evacuate, and causing the temporary closing of the main international airport. Excessive rainfall from Agatha in the region could exacerbate the situation and trigger lahar
Lahar
A lahar is a type of mudflow or debris flow composed of a slurry of pyroclastic material, rocky debris, and water. The material flows down from a volcano, typically along a river valley. The term is a shortened version of "berlahar" which originated in the Javanese language of...

s. However, people working in coffee fields considered the rain brought by the storm to be helpful, removing ash from their trees. According to meteorologists in Guatemala, at least 14 in (355.6 mm) of rain had fallen by the evening of May 29. Several landslides blocked roadways across southern areas of the country, hindering traffic. Following the storm, a three-story building was swallowed by a 30-meter (100-ft) diameter sinkhole
Sinkhole
A sinkhole, also known as a sink, shake hole, swallow hole, swallet, doline or cenote, is a natural depression or hole in the Earth's surface caused by karst processes — the chemical dissolution of carbonate rocks or suffosion processes for example in sandstone...

 caused by Agatha's rainfall.

A mudslide coming down the Agua volcano
Volcán de Agua
Volcán de Agua is a stratovolcano located in the department of Sacatepéquez in Guatemala. It has been inactive since the mid 16th century. At 3,760 metres, Agua Volcano towers more than 3,500 metres above the Pacific coastal plain to the south and 2,000 metres above the Guatemalan...

 left 9 deaths and 12 disappeared in the town of San Miguel Escobar.
In the town of Almolonga
Almolonga, Quetzaltenango
Almolonga is a municipality in the Quetzaltenango department of Guatemala, located on a road between Quetzaltenango city and Zunil. The majority of its population is indigenous, speaking the K'iche' language...

, department of Quetzaltenango
Quetzaltenango (department)
Quetzaltenango is a department in the western highlands of Guatemala. The capital is the city of Quetzaltenango, the second largest city in Guatemala. The inhabitants include Spanish-speaking Ladinos and the K'iche' and Mam Maya groups, both with their own Maya language...

, a mudslide triggered by the storm killed four people after destroying their home, and in total twelve people were killed in Guatemala, while another landslide left 11 people missing.

Officials in the country declared a state of emergency during the afternoon of May 29 as conditions worsened. Many rivers in the country were already swollen and close to over-topping their banks. Many other homes were destroyed in widespread floods and dozens of emergency rescues had to be made. In a press report, President Álvaro Colom
Álvaro Colom
Álvaro Colom Caballeros is the President of Guatemala for the 2008–2012 term and leader of the social-democratic National Unity of Hope .-Early years:...

 stated that, "We believe Agatha could wreak more damage in the country than Hurricane Mitch
Hurricane Mitch
Hurricane Mitch was the most powerful hurricane and the most destructive of the 1998 Atlantic hurricane season, with maximum sustained winds of 180 mph . The storm was the thirteenth tropical storm, ninth hurricane, and third major hurricane of the season. Along with Hurricane Georges, Mitch...

 and Hurricane Stan
Hurricane Stan
Hurricane Stan was the eighteenth named tropical storm and eleventh hurricane of the 2005 Atlantic hurricane season. It was also the sixth of seven tropical cyclones to make landfall in Mexico. Stan was a relatively weak storm that only briefly reached hurricane status...

". These storms were two of the most devastating tropical cyclones to impact the country, killing 384 and 1,513 people respectively.

By the afternoon of May 30, reports from the region stated that 15 people had been killed and 22 others were missing throughout Guatemala. Preliminary damage assessments showed that at least 3,500 homes were damaged. A total of 112,000 people were evacuated. Additionally, at least 20,000 people have been left homeless as a result of the storm. Some areas recorded the heaviest rainfall in over 60 years, measuring more than 36 in (914.4 mm). This also ranks Agatha as the wettest known tropical cyclone to ever strike the country, surpassing Hurricane Mitch. By the next day, the death toll had risen to 92, with another 95 people injured.

Mexico

Throughout southern Mexico, Agatha produced strong winds and heavy rain, as well as high waves, estimated between 2 and 4 m (6.6 and 13.1 ft) high. At least 120 families were evacuated from southeastern Chiapas
Chiapas
Chiapas officially Estado Libre y Soberano de Chiapas is one of the 31 states that, with the Federal District, comprise the 32 Federal Entities of Mexico. It is divided in 118 municipalities and its capital city is Tuxtla Gutierrez. Other important cites in Chiapas include San Cristóbal de las...

, near where the storm made landfall. A yellow alert was also declared for the state as significant flooding was anticipated.

Honduras

After moving inland over Guatemala and Mexico, torrential rains from the remnants of Agatha triggered flash flooding and landslides in parts of Honduras. At least 45 homes have been destroyed and one person was killed in the country. On May 31, the presidents of both El Salvador and Honduras declared a state of emergency for their respective countries.

El Salvador

In El Salvador, widespread flooding took place as heavy rains fell across the country. Throughout San Salvador
San Salvador
The city of San Salvador the capital and largest city of El Salvador, which has been designated a Gamma World City. Its complete name is La Ciudad de Gran San Salvador...

 and five other cities threatened by flooding, emergency officials urged residents to evacuate to shelters. A total of 140 landslides occurred. The highest known rainfall total in the country was 400 mm (15.7 in); however, further rains have fallen since this total was reported. A total of six people were killed in the country. At least two other people are reported missing in the country. By May 30, President Mauricio Funes
Mauricio Funes
Carlos Mauricio Funes Cartagena is the President of El Salvador. He won the 2009 presidential election as the candidate of the left-wing Farabundo Martí National Liberation Front political party and took office on 1 June 2009.-Biography:Funes is married to Dr. Vanada Pignado, who was involved in...

 declared a country-wide state of emergency due to the widespread damage caused by Agatha. According to the Office for the Coordination of Humanitarian Affairs
Office for the Coordination of Humanitarian Affairs
The United Nations Office for the Coordination of Humanitarian Affairs , is a United Nations body formed in December 1991 by General Assembly Resolution 46/182...

, a total of 12 people were killed by Agatha throughout El Salvador and roughly 120,000 individuals were affected across 116 municipalities. At one point, more than 15,000 people were housed in emergency shelters; however, by June 9, this number decreased to just 712. A total of 3162 acres (12.8 km²) of farmland was flooded by the storm, leaving $6 million in losses. Unlike Guatemala which suffered extreme damage in its educational sector, most schools in El Salvador were functional after the storm's passage. Of the 378 schools affected, 63 sustained severe damage. Overall, Agatha wrought $31.1 million in damage across El Salvador.

See also

  • Tropical Depression Eleven-E (2010)
  • List of Pacific hurricanes
  • 2010 Pacific hurricane season
    2010 Pacific hurricane season
    The 2010 Pacific hurricane season was the least active Pacific hurricane season, in terms of the number of named storms and hurricanes, on record, due to a moderate La Niña, unlike the 2010 Atlantic hurricane season, which was one of the most active on record...


External links

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