As Harvey finally fizzles, a look at what made it so nasty

The slowmoving, super-wet and especially devastating storm named Harvey is finally fizzling.

Since first hitting shore near Corpus Christi, Texas, more than a week ago, the storm dumped 27 trillion gallons of rain on Texas and Louisiana — enough to cover all of Manhattan a mile (1.6 kilometers) deep. It set a record for rainfall from a tropical system in the continental U.S., dropping 51.88 inches just outside Houston. That’s only an eighth of an inch behind the U.S. record set in Hawaii in 1950.

The deluge damaged an estimated 156,000 dwellings, and parts of Houston may be flooded for another month. The death toll of 44 ranks it as the mainland’s sixth deadliest hurricane in 50 years.

What made it so bad? Harvey was strange — in how it nearly dissolved once but roared back as a major hurricane, in how it intensified so quickly before hitting land, in how it parked itself over one unfortunate region for so long and, of course, in the amount of rain it generated.

“It had several unique characteristics in terms of its strength and track. And unfortunately they combined to produce a severe impact over a highly populated area,” National Hurricane Center Acting Director Ed Rappaport said.

Harvey was born in the Atlantic southeast of Puerto Rico on Aug. 17, then got downgraded to a tropical wave and breezed into Mexico’s Yucatan peninsula with little fanfare. But once Harvey got into the Gulf of Mexico on Aug. 23, it rapidly exploded into a Category 4 hurricane just a few hours before coming ashore, something experts had not seen happen much before.

It was the first Category 4 storm to make landfall in the United States since 2004. Rappaport and others said it will likely rank among the costliest storms to hit the United States. In some ways, it landed in the perfect place to wreak the most havoc. The worst of its rains stayed to the east of its eye and hit very close to the nation’s fourthlargest city.