The disturbance in the tropical Atlantic, designated Invest 91L by the National Hurricane Center, is showing signs of organization. The NHC is still painting a large potential development area, however, because exactly when the system will become a tropical depression is still quite uncertain. If that ever happens.

The NHC's odds of development are very high, but that's become less certain as the system has lollygagged in the dry air.

A tropical depression is a low bar. It just means that the system has developed an organized circulation. As it moves slowly west, it will be plowing through patches of dusty air, which will likely keep it from intensifying quickly, and the dry air could do it in. If it does organize and the winds reach 40 mph, it will be named Tropical Storm Gabrielle.

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