Humberto could bring more than 10 inches of rain

Tropical Storm Humberto rapidly spun into existence off the Texas coast Wednesday and forecasters said the system poses a dangerous flooding threat to the Greater Houston area as it moves inland Thursday.

The National Hurricane Center advised that once ashore, the slow-moving Humberto could drop 5 to 10 inches of rain across much of Southeast Texas, with isolated totals of 15 inches or more.

There was also concern about forecast models that suggested a lack of steering currents in the atmosphere might cause the system to stall, or even move northward and then loop back toward Houston, as happened with Tropical Storm Allison in 2001.

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