Elsewhere in the tropics, Florence has become our third named hurricane of the 2018 season as it moves across the Central Atlantic.
Under its current track, the storm could move into the lower Mississippi Valley by Tuesday night and make landfall on the northern Gulf Coast later in the evening, forecasters said.
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The storm, bringing gusty winds and heavy rain, is forecast to strengthen into a hurricane by the time it makes landfall along the MS coastline Tuesday evening.
Louisiana Gov. John Bel Edwards, Mississippi Gov. Phil Bryant, and Alabama Gov. Kay Ivey all declared states of emergencies ahead of the storm's landfall.
Waves began to batter parts of the U.S. Gulf Coast on Tuesday as the region felt the first effects of Tropical Storm Gordon, which is expected to become a hurricane before it comes ashore with high winds and heavy rain, forecasters said. It is moving quickly to the northwest at 15 miles per hour.
In the Northwest Florida Daily News coverage area (Santa Rosa, Okaloosa and Walton Counties), southern Santa Rosa County is expected to receive the heaviest impacts from the storm.
A storm surge warning has been issued for the area stretching from Louisiana to Alabama.
A number of schools across Louisiana, Alabama, Florida and MS will not open Tuesday and others announced they would close early ahead of the storm's arrival.
West of the mouth of the Pearl River to Grand Isle, including Lake Pontchartrain and Lake Maurepas are also under a tropical storm warning.
The Mississippi Emergency Management Agency warned in a Tuesday update that tornadoes will be possible Tuesday afternoon through the evening.
Expect a 50 percent coverage of showers and storms Tuesday afternoon in Central Florida. The area has already been heavily impacted by this summer's so-called "red tide"- massive algae blooms that have caused waves of dead marine life to wash up along the coast.