south atlantic storms

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rick-g
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south atlantic storms

#1 Postby rick-g » Sat Jan 03, 2004 10:18 pm

I saw on a TV special that the south atlantic has had a storm or two. I know that there is no hurricane season for the South Atlantic, does anyone have any info on storms there?
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Derek Ortt

#2 Postby Derek Ortt » Sat Jan 03, 2004 10:28 pm

A weak TS/strong TD formed near Congo in April of 1991. Didnt affect land though as it was sheared apart as it meandered in the open Atlantic
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Anonymous

#3 Postby Anonymous » Sat Jan 03, 2004 11:25 pm

Are waters warm, does high pressure ever form.... questions need to be answered to say they can form.
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weatherluvr
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#4 Postby weatherluvr » Sat Jan 03, 2004 11:52 pm

The waters get marginally warm enough, but the upper-level westerlies blow at a much lower latitude in the South Atlantic. Plus you have the Falkland current going up the southeast coast of South America, and another cold current (the Namib?) coming up the southwest coast of Africa, so it doesn't leave a lot of room for something to develop.
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Anonymous

#5 Postby Anonymous » Sun Jan 04, 2004 1:31 am

Somethings could spin up then die if waters get around 77-80 degrees.
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#6 Postby Hurricanehink » Sun Jan 04, 2004 10:02 am

I found a pic of the 1991 South Atlantic Tropical Storm. http://www.metoffice.com/sec2/sec2cyclo ... 910413.gif
On this site http://www.metoffice.com/sec2/sec2cyclo ... ages/Misc/ you can find other odd cylones, like the Medditterean Sea storm.
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rick-g
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#7 Postby rick-g » Mon Jan 05, 2004 7:07 am

I wish I can remember where I saw the image. It was on a tv show about hurricanes.

Thanks for the info
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#8 Postby Derecho » Tue Jan 06, 2004 2:01 am

The other main thing is in the Atlantic, the ITCZ is NEVER south of the equator, so it really limits what a storm can form from.

But, as has been mentioned, it's mainly a shear issue, not a water temp issue.

If you ever glance at a shear map for the South Atlantic it's nearly continuous screaming shear.

That said, I'd estimate the South Atlantic probably has a real TS every 30 years or so.

We've only had satellites for a limited time.
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