Hurricane Humberto Could Merge Into Rare Monster Storm With Another CycloneNHC: Closely Eyeing Invest 94-L (X)TS Humberto, Hurricane Gabrielle & AL-94Tropical Storms Brewing In Atlantic Waters VIDEO: Cat 4 Hurricane Gabrielle & Two More Tropical DisturbancesGabrielle Now A Hurricane, No Landfall Threat To U.S. Mudslides Trap Drivers, Damage Homes In USGabrielle Expected To Become Hurricane This WeekendTropical Storm Gabrielle Has FormedTropical Depression 7 Forms In AtlanticHurricane Center Monitoring Two Systems In Atlantic Researcher: Storm Surge, Rainfall and Wind Should Determine Storm Category