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Hurricane Beatriz (2011)
Hurricane Beatriz was a Category 1 hurricane that killed four people after brushing the western coast of Mexico in June 2011. Originating from an area of disturbed weather on June 19, several hundred miles south of Mexico, Beatriz gradually intensified. Gaining latitude, the system became increasingly organized and reached hurricane status on the evening of June 20. The following morning, Beatriz attained winds of 90 mph (150 km/h) as it passed roughly 15 mi (20 km) of Mexico. Due to its interaction with land, the hurricane abruptly weakened hours later. Early on June 22, Beatriz dissipated over open waters. Prior to Beatriz's arrival in Mexico, hurricane watches and warnings were issued for coastal areas. Hundreds of shelters opened across the states of Colima and Guerrero. Heavy rains from the storm triggered significant flooding along the Sabana River in Acapulco, killing four people. However, the overall effects of Beatriz were limited and the rains were largely beneficial in mitigating a severe drought.
==Meteorological history==
On June 16, 2011, a trough situated off the southern coast of Guatemala showed signs of possible tropical cyclogenesis. Though located within an area favoring development, the system remained broad and disorganized as it moved slowly west-northwestward. Gradually, convection consolidated around an area of low pressure. On June 18, a Tropical Cyclone Formation Alert was issued for the system as it was expected to develop into a tropical depression within 24 hours. On the following day, the low further developed and was declared Tropical Depression Two-E by the National Hurricane Center at 1500 UTC. Upon being declared, the depression was located about 335 mi (540 km) south-southeast of Lázaro Cárdenas, Mexico. However, after post-analysis, the depression had actually developed nine hours earlier. Maintaining a west-northwesterly track in response to a subtropical ridge to the north, the depression was forecast to move into a favorable environment, characterized by low wind shear and sea surface temperatures up to . Three hours after classification, the depression strengthened Tropical Storm Beatriz, the second named storm of the season.
Early on June 20, convection increased markedly with several overshooting tops (denoted by cloud-top temperatures below ) appearing on satellite imagery. A notable increase in southerly outflow also took place. As the subtropical ridge north of the storm weakened, Beatriz acquired a more northerly component to its track, bringing the center of the storm closer to Mexico. Convective bands gradually wrapped around the system throughout the day. During the afternoon hours of June 20, a hurricane hunter aircraft found Beatriz just below hurricane strength, and subsequently, the system was upgraded just a few hours later, while situated roughly 85 mi (140 km) southeast of Manzanillo, Mexico. Early on June 21, a wide eye developed within the central dense overcast. In light of this, the National Hurricane Center estimated Beatriz to have attained winds of 90 mph (150 km/h) along with a barometric pressure of 977 mbar (hPa; 28.85 inHg); however, it was noted that this could be conservative based on estimates of 105 mph (165 km/h) from the University of Wisconsin and the Satellite Analysis Branch.
Throughout the morning of June 21, Beatriz brushed the coast of Mexico, with the center passing roughly 15 mi (20 km) south-southeast of La Fortuna, Mexico. Centered just off the coast of Mexico, the system interacted with land and began weakening. Hours later, convection rapidly diminished as dry air became entrained in the circulation. In response to quick degradation of the system's structure, the NHC downgraded Beatriz to a tropical storm. Rapid weakening continued throughout the day and by the evening hours, the storm no longer had a defined circulation. Lacking an organized center and deep convection, the final advisory was issued on Beatriz. The storm's remnants persisted for several more hours before dissipating roughly 175 mi (280 km) southwest of Cabo Corrientes, Mexico.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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