I went through the absolute worst of Andrew in Miami in 1992.It basically lasted from 3:30 am to 6:30 am but it came with 155 mph winds and 200 mph gusts,3 hours and it basically destroyed EVERYTHING,2 story houses became 1 story,roofs on houses were ripped off,trees down everywhere,pharmacy signs ripped from the storefront and ended up 2 miles away,all in 3 hours,it flooded somewhat but not as bad as I've seen in other storms that stay longer.So you could have storms that come really quick and some that stay for a day or two in the general area that could bring more rain,if you add winds of over 100 mph to a slow moving storm it could do a lot of damage as well.If a storm like Andrew would have "stuck around" for any longer I wouldn't be here writing this.