How do Invest storms get numbered?

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Michele B
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How do Invest storms get numbered?

#1 Postby Michele B » Sun Aug 11, 2019 10:37 pm

I mean, I get it...they’re called “invests” b/c they are going to. be investigated for tropical development.

But how do they get numbers? It seems like they ALL get numbers between 91 and 96 No higher- no lower. So what is the system for numbering them? Or is there one?

Thanks for taking the time to help a newbie with a dumb question!
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toad strangler
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Re: How do Invest storms get numbered?

#2 Postby toad strangler » Sun Aug 11, 2019 11:40 pm

Invests are numbered 90 through 99 and are rotated in chronological order. Once 99 is used it reverts back to 90. Also each basin has a distinct letter that follows the number. In the Atlantic, that letter is “L”
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wxman57
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Re: How do Invest storms get numbered?

#3 Postby wxman57 » Mon Aug 12, 2019 5:39 am

To further the explanation, all storms in the Atlantic are given a 2-digit number for identification (AL01, AL02, etc.) in a database. Those numbers are for designated systems (depressions, tropical storms, hurricanes). The NHC needed to use a classification range that was above the highest number of active storms that might be seen in a season, so they use 90-99 for invests. Test storms are given a range of 80-89, I believe. That leaves 0-79 for designated storms or for other testing purposes.
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