Tropical Storm Ernesto Dumps Rain on Mexico

Warm ocean temperatures mean more moistures in the air and stronger hurricanes.
3:00 | 08/09/12

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Transcript for Tropical Storm Ernesto Dumps Rain on Mexico
Hurricane season is about to rev up and could pack a more powerful punch. You can already see it in the gulf of mexico. Tropical storm ernesto gearing up there. Now a new storm is on the way. Abc's sam champion tells us what we're in for and why. Reporter: As tropical strom ernesto dumps flooding rains across central mexico, it is one of two hurricanes and four tropical storms to develop already this season. Tropical storm beryl is just coming on shore. Holy cow. The roads are impossible. The sidewalks are flooded. Reporter: Tropical storms alberto and beryl flared up before the season even officially began downing trees, 0 /- flooding streets. And according to noaa, this bad season is about to get worse. It takes a whole set of conditions to produce a hurricane and right now that whole set of conditions is favorable. Reporter: Among those conditions, much warmer than normal atlantic ocean temperatures. As the waters warm more they can put more moisture into the air and that can make a stronger hurricane. Reporter: Even the arrival of a hurricane-killing el nino, which normally causes wind shear, breaking tropical systems apart, will not slow this season. Noaa now expects 12 to 17 named storms, including 5 to 8 hurricanes of which 2 or 3 could be major with winds of at least 111 miles per hour. But it's not just the winds. Flooding is the leading cause of death from hurricanes. And a slow-moving tropical storm can produce tremendous amounts of rain. We saw that in june, with tropical storm debbie in florida, and who can forget last year when tropical storm irene inundated the northeast? From new york city -- some of the steadier rain bands are making their way in. Through new england, swamping vermont. Now, one of the reasons experts think the second half of the season will be very active is, it's already started. We'll show you here, the three circles are the tropical systems we're looking at right now. Ernesto, this little wave that's near jamaica. And td-7, just named in the last couple of hours. It will take the "g" name. And off the coast of africa, we are watching, this is where storms form. That little area of clouds is likely to be a tropical player for next week. We don't know exactly what's going to happen with those but we have to be y. Reporter: The thing is, look. There are this many systems on the board. Every coastal community has to watch them. Okay, sam champion, thank you. Now, to our consumer watchdog, and a serious warning

This transcript has been automatically generated and may not be 100% accurate.

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