Journal article

The first South Atlantic hurricane: Unprecedented blocking, low shear and climate change

AB Pezza, I Simmonds

Geophysical Research Letters | AMER GEOPHYSICAL UNION | Published : 2005


In March 2004 the first-ever reported hurricane in the South Atlantic hit southern Brazil. Here we show that Catarina initiated as an extratropical cyclone in a frontal system, undergoing Tropical Transition two days later under persistent low vertical wind shear over near-average water temperatures. The trajectory derived from an automatic tracking scheme showed a rare loop before the cyclone approached the coast for a second time. The vertical structure presented anticyclonic relative vorticity above and a small 300 hPa warm core embedded in a cold area. A mid-to-high latitude-blocking index showed that the five days before the genesis were in the 0.6% first percentile of intensity conside..

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University of Melbourne Researchers