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Hurricane Carla

Category 4 Atlantic hurricane in 1961

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Hurricane Carla
Unknown author · Public domain

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Through Flood, Cuba and Tornado

While crossing the Yucatán Channel, the outer bands of Carla brought high winds and local flooding in western Cuba and the Yucatán Peninsula. In Texas, sustained winds as high as 140 mph (230 km/h) and a storm surge of 22 feet (6.7 metres) were observed in Port Lavaca. Carla also spawned several tornadoes in the state, including an F4 tornado near Galveston which killed eight people.

Throughout Texas, Carla damaged or destroyed over 60,000 buildings and killed 34 people. Several tornadoes also touched down in Louisiana, killing six people and causing additional damage. Heavy rainfall from Carla impacted other states, especially Kansas and Missouri, where flash flooding severely damaged crops and killed six people. Overall, Carla resulted in over $470 million in losses and 46 fatalities. The name Carla was retired following the season.

Meteorological history

As early as September 1, a tropical disturbance – an area of convective activity – was observed tracking westward across the Caribbean Sea within the Intertropical Convergence Zone (ITCZ). Around that time, an anticyclone was situated over the western Caribbean Sea at the upper-tropospheric levels. Surface analysis indicated that a low-level circulation was developing early on September 3, and this became a tropical depression – a tropical cyclone with sustained winds of less than 39 mph (63 km/h) – about 175 miles (282 km) northwest of Barranquilla, Colombia at 1200 UTC.

The storm is estimated to have strengthened into a 40 mph (64 km/h) tropical storm by 1800 UTC on the September 4. Operationally, the system was not considered a tropical storm until midday on the 5th, at which point it was given the name Carla. A reconnaissance aircraft flight on September 5 found that Carla was continuing to intensify, with a central pressure of 998 mbar (29.5 inHg) and winds rising to 50 mph (80 km/h). Radar indicated that the system was an unusually large tropical cyclone, with convective bands extending about 520 miles (840 km) outward from the center. Around midnight on September 6, Carla passed near Swan Island, which reported a barometric pressure of about 995 mbar (29.4 inHg) and wind gusts of 60 mph (97 km/h) from the southwest. Aircraft reconnaissance that day found that the storm had deepened substantially, with the barometric pressure falling to 982 mbar (29.0 inHg), and Carla is estimated to have reached hurricane intensity earlier in the day.

The hurricane remained relatively steady for much of the next day, with the pressure measured by aircraft that morning remaining near 982 mbar (29.0 inHg). However, Carla began strengthening again late in the day, reaching Category 2 strength. Shortly thereafter, the hurricane crossed the Yucatán Channel and entered the Gulf of Mexico, where a strong high-pressure area forced Carla to resume its original northwesterly course.

Carla continued to strengthen, and by midday on September 8 the storm was a Category 3 major hurricane. Carla was a large hurricane, with a radius of maximum winds 40 miles (64 km) wide. The storm strengthened into a Category 4 hurricane on the morning of September 10, while approaching the Gulf Coast of the United States, and reached its peak intensity early on the 11th, with maximum sustained winds of 145 mph (235 km/h) and a minimum pressure of 927 mbar (27.4 inHg). Operationally, Carla was considered to have had peak winds of 175 mph (280 km/h), making it a Category 5 hurricane on the Saffir-Simpson scale, the highest classification. However, a reanalysis of the storm published in 2018 concluded that Carla never reached Category 5 intensity.

Late on September 11, Carla made landfall on the northeastern tip of Matagorda Island, Texas with winds of 145 mph (235 km/h) and a minimum pressure of 931 mbar (27.5 inHg). The winds were estimated using the pressure-wind relationship for a storm of its size and latitude as well as two reports of sustained winds near 140 mph (230 km/h) along the coast. Carla's landfall pressure was the lowest in Texas during the 20th century, and the second lowest on record in the state after the 1886 Indianola hurricane. Carla rapidly weakened inland, and fell below hurricane strength by noon on September 12. Late on that day, the storm curved just east of due north. As Carla moved inland, it spawned an outbreak of tornadoes, all of them occurring to the right of the track. After reaching Oklahoma on September 13, Carla transitioned into an extratropical cyclone while located over east-central Oklahoma. The remnants of Carla moved rapidly northeastward and brought heavy rainfall to some areas of the Great Plains and Midwestern United States. By September 14, the remnants moved over Lake Huron as an extratropical depression. On September 16, Carla's remnants briefly regained gale-force winds before dissipating shortly after midnight on September 18.

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