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Tropical Storm Colin heading toward Florida's Gulf coast

This NOAA satellite image taken Monday, June 6, 2016 at 12:45 a.m. EDT shows Tropical Storm Colin continuing to move due north over eastern portions of the Gulf of Mexico. Some of the outer rain bands have also begun moving over the western Florida shoreline as the tropical storm continues to move northward. An extended area of clouds is observed stretching from a low pressure system over southern Quebec over much of the eastern seaboard and connecting to Colin. Much of the central United States remains cloud-free with high pressure dominating. (NOAA/Weather Underground via AP)

This NOAA satellite image taken Monday, June 6, 2016 at 12:45 a.m. EDT shows Tropical Storm Colin continuing to move due north over eastern portions of the Gulf of Mexico. Some of the outer rain bands have also begun moving over the western Florida shoreline as the tropical storm continues to move northward. An extended area of clouds is observed stretching from a low pressure system over southern Quebec over much of the eastern seaboard and connecting to Colin. Much of the central United States remains cloud-free with high pressure dominating. (NOAA/Weather Underground via AP)  (The Associated Press)

Tropical Storm Colin is on its way to strike Florida on Monday and threatening rains forecasters say could cause some serious flooding along much of the state's Gulf coast.

A large portion of Florida's western and Panhandle coast was already under a tropical storm warning when the National Hurricane Center announced that a quickly moving depression had become a named storm. The center says it's the earliest that a third named storm has ever formed in the Atlantic basin.

Colin's maximum sustained winds Monday morning are near 40 mph (65 kph) with some strengthening forecast before reaching the Florida coast. The storm is centered about 410 miles (665 kilometers) southwest of Tampa and moving north near 10 mph (16 kph).