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General Discussion >> Hurricane Ask/Tell

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Weather Guru

Reged: Thu
Posts: 116
Loc: Port St. Lucie, Fl
INVEST Numbering
      #9265 - Sat Aug 16 2003 08:26 AM

Would someone explain the system they use when numbering and lettering the invest they post on NRL site?
It was a bit confusing with Erika when sometimes 91L and at other times 21L were showing. I thought maybe one of them was tracking the invisible LLC somewhere to the south while the other was for the convective mass and midlevel center that I was watching.

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Ed DunhamAdministrator
Former Meteorologist & CFHC Forum Moderator (Ed Passed Away on May 14, 2017)

Reged: Sun
Posts: 2565
Loc: Melbourne, FL
Re: INVEST Numbering
      #9299 - Sun Aug 17 2003 08:26 AM

I think that the 21L was an error, or at least something that should not have appeared on the NRL site (it may be an internal number, but I doubt it) - I've seen it once before myself. Normally the numbers are used in sequence starting with 90 and ending with 99 - then starting with 90 again, etc. The letter 'L' is used to designate a North Atlantic Ocean Invest. Probably the best answer is to send an email to NRL.

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