(KMDL-FM) The National Hurricane Center continues to track three viable tropical systems in the tropical Atlantic Basin. nhc.noaa.gov nhc.noaa.govThe storm system that is of most concern to National Hurricane Center forecasters is the storm system that is shaded in red. The other system, shaded in yellow, has been given a very low 20% probability of growing stronger over the next week. Tropical forecasters have designated this system as Invest 92L. This puts the center of this storm system approximately 800 miles southwest of the Cabo Verde Islands.