What they found was that during a period of less than two weeks in 1996, Atlanta's heat island caused convective thunderstorms, causing it to rain on the city or to the south and southeast about 50 or 60 miles, says Dale Quattrochi of NASA's Marshall Space Flight Center.
Mumbai was overwhelmed in 2005 when nearly a metre of rain was dumped on the city in 24 hours.
It dumped around 7 inches of rain on Oklahoma City in the span of a few hours and made the tornado difficult to spot for motorists trying to beat it home, said Bruce Thoren, a meteorologist with National Weather Service in Norman.
WSJ: Tornado-Hit Oklahoma Struck Again; Mother and Baby Dead
Friday's broad storm in Oklahoma hit during the evening rush hour and stuck around, causing havoc on Interstate 40, a major artery connecting suburbs east and west of the city, and dropping so much rain on the area that streets were flooded to a depth of 4 feet.
WSJ: Tornado-Hit Oklahoma Struck Again; Mother and Baby Dead
On the other side of the country, relentless freezing rain in Salt Lake City forced all of the runways at the city's international airport to close, according to the Federal Aviation Administration.
The manager of Arco Iris Amazonica, a small hotel in the rain forest city of Iquitos, told police the couple stayed there on February 16 and told him they planned to travel to the town of Naplo, a 15-day trek.
Wearing the signature red ties of its salespeople, Goklaney and two colleagues brave the monsoon rain to trek up six flights of stairs in a building on Malabar Hill, the city's upmarket residential area.
The city remains on high alert and further heavy rain is forecast.
Thursday afternoon, rain began to fall on the thousands of people gathered under an overhang at the city's convention center.
Depending on Rita's track, New Orleans could receive several inches of rain, straining the city's fragile levees.
The city of Hilo, on the state's main island, gets 277 days of rain per year, more than any other town.
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