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>> "world news tonight with david muir" is next. >> for sandhya patel all of us here, thanks for joi tonight, bracing for impact. the major tropical system that could become a dangerous hurricane. several states on alert. authorities warn the mississippi river has never been this high, with 20 inches of rain now coming. it will test the levees in new orleans. rob marciano live with the new track and the timing tonight. also tonight, the passenger jet rocked by sudden and severe turbulence 36,000 feet in the air. the jet plummeting. oxygen masks dropping. nearly three dozen passengers hurt. many hitting their heads on the ceiling. the u.s. coast guard and the high speed chase on open water, going after a suspected narco-submarine. the stunning discovery inside. in new york city tonight, the taxi slamming into a restaurant with customers inside right at lunchtime. multiple injuries. the deadly outbreak in a retirement community.