A disorganized low-pressure area off Florida's east coast is showing increasing chances of becoming a tropical depression or tropical storm later in the week, the National Hurricane Center said. Even now, it's already having an influence on Florida weather with isolated torrential rain.

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A tropical storm may form this week, bringing risks of flash flooding and strong thunderstorms from Florida to Louisiana.

High pressure briefly moves over Southeast Texas after Tuesday, bringing sunshine and dryness. But tropical downpours are coming back soon.

A disturbance near the Florida coast has a 30 percent chance of turning into a cyclone this week, says the National Hurricane Center.

Nari was a tropical storm in the North Pacific Ocean late Monday Japan time, the Joint Typhoon Warning Center said in its latest advisory. Typhoon season is year-round; however, most typhoons form from early July through mid-December.

The National Weather Service in Mobile will also be closely watching the system and expects the risk for rip currents along the Alabama and northwest Florida coasts to increase to moderate by Wednesday and high by Thursday, which means swimming in the Gulf will be hazardous.

A tropical storm rolling towards the Gulf of America sparked a series of delays at major airports trailing up the entire East Coast on Monday evening, including JFK and LaGuardia. The Federal Aviation Administration extended numerous ground stops at more than a dozen major airports from Florida to New York,