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Be of short duration of 12 hours but that is a very, very significant hazard so we're asking everyone to take this very seriously. more than 200 flood gates are being closed. let's get to meteorologist derek van dam live in the weather center. derek, this storm is unusual in that the timing feels a bit unusual, too. july, a hurricane making landfall. is that sort of weird? >> yeah, normally it would be about august or september when the peak of the hurricane season occurs, but now we're talking about our second named storm of the season and it's only the first half of july. we do not like to s...

Water damage. derek van dam, this is a bit of an unorthodox storm, isn't it? >> it's the direction where it's moving from and where it came from. this is not the circulation pattern we want to see in the kbufl of mexico at this time of year, especially considering that water temperatures right along the coast of louisiana who have hovering 90 to 92 degrees. that is jet fuel for storms. we have flash flood watches for millions of americans. we received over a month's worth of rain in just a six-hour period far exceeding july's average rainfall totals in the city. incredible. on top of that we h...

Acres. that's nearly 3,000 hectares for our international viewers. >> days of heavy rains, raising floodwaters in the southeastern part of the united states. our meteorologist derek van dam is here to tell us about it. >> it has been days of torrential rainfall to say the least, 10 inches of rain almost, just since wednesday in parts of north carolina. i want to show you video out of the region. it is quite dramatic. you see firefighters and police helping several vehicles get out of this high water situation. drivers required assistance, the water came down extremely quickly. interstate acces...

People comb the shorelines looking for any clues, what skerritt believe is probably a piece of the missing plane's wing. tonight on the ground graphers tell cnn this could be the new front line for the search for mh370, which is why they're looking not only off reunion island, but near madagascar, the seychelle islands, and mozambique. the reason -- the gyre. >> it's a permanent circulation pattern in the indians ocean that runs counter clockwise, starts off the coast of australia, moves north, and i could up in the southern equatorial current before it turns south and returns. >> van gurley s...

That same period. >> now, the average is, what, 12 named storms, 6 hurricanes, and 3 major hurricanes. why may the difference be greater this year? >> so we have large-scale circulation pattern, climate factors that are certainly playing a role here. very warm temperatures in the atlantic ocean. this is part of a longer term cycle that we have seen. there are patterns associated with the el nino or la nina pattern in the pacific, which will lend itself to a decrease in wind shear in the upper levels, which will allow these storms to grow to more intense levels than what we saw last year, for e...