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South Atlantic tropical cyclone |
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A South Atlantic tropical cyclone is an unusual weather event. Strong wind shear (which disrupts cyclone formation) and a lack of weather disturbances favorable for tropical cyclone development make any hurricane-strength cyclones extremely rare. If a "hurricane season" were to be demarcated in the South Atlantic, it would most likely be the opposite of the North Atlantic season, from December to May with mid-March being the peak when the oceans are warmest in the Southern Hemisphere.
Below is a list of known South Atlantic tropical cyclones.
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| Category 2 tropical cyclone (SSHS) | |||
|---|---|---|---|
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| Duration | March 24—March 28 | ||
| Intensity | 155 km/h (100 mph) (1-min), 972 hPa (mbar) | ||
Cyclone (or Hurricane) Catarina was an extraordinarily rare tropical cyclone, forming in the southern Atlantic Ocean in March 2004. Just after becoming a hurricane, it hit the southern coast of Brazil in the state of Santa Catarina on the evening of March 28, with winds estimated near 155 km/h (100 mph), making it a Category 2 storm on the Saffir-Simpson Hurricane Scale. The cyclone killed 3-10 people and caused millions of dollars in damage in Brazil.
This event is considered by meteorologists to be a nearly once-in-a-lifetime occurrence.
On April 10, 1991, what was either a strong tropical depression or a weak tropical stormcitation needed formed in the eastern South Atlantic, recorded by weather satellites off the coast of Angola. It reached a peak on the 13th, and dissipated two days later, drifting west-southwestward from where it formed. Of the few South Atlantic tropical cyclones that have existed, this was the only one in the eastern Atlantic. This was also the first South Atlantic tropical cyclone ever observed.
A small area of convection developed on a trough of low pressure in mid January off Brazil. It organized and appeared to become a tropical depression on January 18. The next morning, it had a small CDO and well-defined bands, and the system, either a weak tropical storm or a strong tropical depression, likely reached its peak. Located 150 nautical miles (280 km) southeast of Salvador, Brazil, it weakened as upper level shear, typical for the basin, prevailed. The depression moved inland on the 20th as a circulation devoid of convection, and dissipated the next day over Brazil, where it caused heavy rains and flooding. This would mark the first time in recorded history that two tropical cyclones (Catarina and the January storm) have been seen during the same year in the South Atlantic, and may be considered to make up the 2003-04 South Atlantic hurricane season.1
A small area of convection 600 miles southeast of Rio de Janeiro was tracked into an area of relatively low shear and marginal 26°C waters on February 23, 2006. The wave had deep convection, was able to form a closed LLC and had 35 mi/h (56 km/h) winds as measured by Quikscat on February 24, 2006. These characteristics were operationally recognized for three hours before high shear began to tear the system apart, just short of the six hours required to be officially declared a tropical depression. It is possible that the system maintained these features longer and may have briefly been a tropical depression. While under study, the system was referred to as 90L Invest. The shear would eventually cause the system to dissipate later that night. Image
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