(CNN) — Tropical Storm Humberto is spinning in the west-central Atlantic, but the bigger question for the United States is what’s brewing behind it.

Humberto is not a direct threat to the US, but it could rapidly intensify and grow into a major hurricane this weekend as it tracks northwest, most likely staying west of Bermuda by early next week.

All attention then turns to a mess of thunderstorms moving through the northern Caribbean, known as Invest 94L. It’s already drenching Puerto Rico, the Virgin Islands and Hispaniola, and it has a high chance of organizing into Tropical Storm Imelda.

The track of this potential storm and its level of impact on the Southeast coast is more uncertain than usual because of how many different factors are involved, including its potential interaction w

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