Updated at 10:45 a.m. ET on Wednesday, Sept. 24, 2025

The National Hurricane Center has designated two " invests " – tropical systems they are investigating with special computer models. Invest 93L is a large system in the central tropical Atlantic surrounded by dust and dry air. It already has winds over 40 mph, so it will become Tropical Storm Humberto as soon as the NHC determines there’s a closed circulation.

Invest 94L is a disorganized system nominally centered near Puerto Rico and the Virgin Islands that’s producing pockets of heavy rain over the entire northeast Caribbean.

WHAT IS AN INVEST DURING HURRICANE SEASON

The atmospheric pattern over the eastern U.S. and the western half of the Atlantic is extremely complex. Besides the two invests, there is a relatively small upper-le

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