"It's very typical for October and it's not at all unusual for tropical storms to form in the western Caribbean", Feltgen said.
It has a 30 percent chance of strengthening into a tropical system in the next 48 hours.
This year has already been an exceptional hurricane season, and a 16th named tropical storm would make it the busiest since 2012.
Invest 93L is a broad area of low pressure now producing disorganized showers and thunderstorms in Nicaragua and Honduras.
The system is expected to impact our weather in Central Florida on Saturday - but so is a cold front that will drop temperatures into the 40s on Sunday night.
"Shower and thunderstorm activity has increased and become more concentrated in association with a trough of low pressure over the northwestern Caribbean Sea", read Friday's NHC outlook.More news: Taylor Swift Goes TOTALLY Naked In New Music Video
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The Potential Tropical Cyclone 18 has developed in the Caribbean and is expected to soon become Philippe, according to the National Hurricane Center.
The system has a 40 percent chance of developing into at least a tropical depression within five days. "The good news is whatever this is should stay well to our east".
The disturbance will start to move to the northeast, producing heavy rainfall in the Cayman Islands and Cuba Friday and Saturday.
Bahamas: 4 to 8 inches with maximum totals of 10 inches.
An approaching cold front front is expected to move into the Nature Coast north of Tampa Saturday evening and move south of Fort Myers overnight.
A slight risk for excessive rainfall that could cause flooding was issued by the Weather Prediction Center for areas from the Keys through parts of the Treasure Coast.