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down in florida, this powerful tornado ripping through ft. lauderdale, damaging structures and power lines. >> this is the first tornado i have ever seen in my life. >> reporter: the snow finally tapering off here. now the shift becomes the scramble of salt and sand trucks because we're worried about a flash freeze tonight. black ice potentially in the morning as commuters get back to work, kids get back to school. looking ahead to the middle part of the week, the warm rain coming in to melt all the snow, a serious flood threat ahead. linsey. >> a second winter wallop on the way. thank you. >> linsey: tonight, the faa says certain 737 max 9 jets will remain grounded until the agency is satisfied they're safe. federal investigators are trying to piece together what caused a door plug to come off just after takeoff from portland, oregon, leaving a gaping hole in the fuselage. fortunately, no one onboard was seriously hurt. here's abc's jaclyn lee. >> reporter: tonight the ntsb zeroing in on what caused a door