Video: Isaac?s winds to push water ashore in Biscayne Bay

>>> now to that big storm gathering strength tonight and threatening to disrupt the republican national convention in tampa . at this hour, there are new tropical storm watches in parts of florida. weather channel meteorologist jim cantore joins us at weather channel 's headquarters. this became a serious tropical system.

>> yes, and it's not done yet and large enough to impact areas in what we call the cone or forecast cone and certainly looks like it's going to impact tam tampa . here are the tropical storm watches which by tonight or tomorrow morning could become tropical storm warnings . we fully anticipate that. i'll tell you why those watches are on the east side in just a minute. here is the storm as you mentioned, david, this thing kind of grew into its shoes today so to speak and it's going to continue to travel up off into the northwest as we go through the next 24 to 48 hours before emerging on the north side of cuba. it is going to be kept tropical storm strength we think, the land is going to inhibit that but once it emerges north of cuba, probably passing over havana, eventually key west somewhere west of tampa , no question, there will be impacts in through here and up toward the gulf coast as we head towards tuesday evening. what's interesting about this storm is even outside the cone because it is so large we are going to have lots of wind coming in to biscayne bay , that means a good chance of flooding the areas that normally flood. watches are out, we expect them to go to warnings, tampa impacts probably on tuesday morning as those winds, david, go from offshore to onshore and potentially push all that water up into the bay.

>> nobody knows severe weather better than you. we'll be following your forecasts in the hours and days ahead, jim, thank

Source: http://video.msnbc.msn.com/nightly-news/48784538/

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