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What is an Invest?

August 20, 2014

On weather.com and The Weather Channel you may hear us use the term "Invest" (short for Investigation) followed by the numbers 90 through 99 and either the letter "L" for the Atlantic basin systems or "E" for the eastern Pacific systems. 

These full labels in the Atlantic would be displayed as Invest 90-L, Invest 91-L, etc. In the eastern Pacific, you would see Invest 90-E, Invest 91-E, etc.

This naming convention is used by the National Hurricane Center to identify features they are monitoring for potential future development into a tropical depression or a tropical storm.

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According to the National Hurricane Center, by designating a tropical weather system as an "Invest", the collection of specialized data sets and computer model guidance on the area of interest can begin. This collection and processing of data is shown on a number of government and academic websites for analyzing.

That said, the "Invest" assignment does not correspond to how likely a system may develop into a tropical depression or storm.

Once the end of the list is reached with either Invest 99-L in the Atlantic or Invest 99-E in the eastern Pacific, it starts back over again with Invest 90-L or Invest 90-E.

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