The storm — moving north at about 8 mph — is expected to become a tropical storm before reaching the Florida coast. Maximum sustained winds are near 35 mph.
Isolated tornadoes are possible Monday afternoon in parts of Florida and southern Georgia.
Regardless of development, heavy rains and flooding are expected in the Yucatan Peninsula, western Cuba, the Florida Keys and Florida's Gulf Coast over the next few days.
Florida Gov. Rick Scott planned a briefing with state emergency management officials Sunday afternoon.
Sand bags were being distributed to residents in St. Petersburg, Tampa and nearby cities.
1 of 2
Round 1 moving north of Tampa Bay, round 2 moving in from the south. #flwx http://pbs.twimg.com/tweet_video_thumb/CkNO-wYUoAA8OSq.jpg
What St. Petersburg is doing:
A tropical storm warning is in effect for the Tampa Bay area. Forecasters and computer models have adjusted the path slightly northward with landfall of the storm's center in the Big Bend region of the state. Even on that course, heavy rains will impact St. Petersburg with current projections in the range of 4 to 6 inches, with the heaviest rain hitting Monday afternoon and evening. Tides are expected to run 3 to 4 feet above normal Monday evening and Tuesday morning. There is also a probability of water spouts that could move on shore along the coast. Historically flood prone areas in St. Petersburg should prepare for localized flooding.
Hurricane hunters with the National Hurricane Center will evaluate the system his afternoon.
The St. Petersburg Office of Emergency Management is monitoring this storm closely and preparing for the impacts the storm may cause. The following actions have taken place or are in motion:
Colin is the earliest third tropical storm to form on record in the Atlantic basin. hurricanes.gov #Colin http://pbs.twimg.com/tweet_video_thumb/CkN_SKPWgAAvyM3.jpg