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Invest in S. Atlantic off Brazil


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There's some potential. Currently it's just a mostly inland area of low pressure, but it will drift SE with a developing upper level anticyclone. Slow organization next few days, then it might develop, but it's pretty rare to get a full tropical cyclone there (Hurricane Catalina 2004 is the only known case).

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Looking pretty good right now.

Named STS Arani

SPECIAL WARNING

ISSUED AT 1500 GMT - TUE - 15/MAR/2011

SUBTROPICAL STORM ARANI WITH 998HPA AT 24S037W ASSOCIATED CICLONIC WIND FORCE 8/9 AFFETING 180MN AROUND CENTER MOVING TO E/SE WITH 10/15 KT.

VALID TILL161500 GMT

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Is this highly unusual to have a named storm this early in the south Atlantic?

It's highly unusual to have a named storm ever in the South Atlantic.

In fact, speaking of names... when did the naming start down there? I wasn't aware of any formal name list.

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It's highly unusual to have a named storm ever in the South Atlantic.

In fact, speaking of names... when did the naming start down there? I wasn't aware of any formal name list.

Nah, they're not that uncommon. North Atlantic-like STSs happen about every other year down there (Braun et al. in publication). It was only recently, after Katarina, that the Brazilians started naming them. There is no formal WMO-approved list, it's just whatever the Brazilians want to call them.

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Nah, they're not that uncommon. North Atlantic-like STSs happen about every other year down there (Braun et al. in publication). It was only recently, after Katarina, that the Brazilians started naming them. There is no formal WMO-approved list, it's just whatever the Brazilians want to call them.

So an STS every other year and a TC once in a blue moon. Better than the SEPAC, I guess.

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