Tropical storm or not, models suggest wet Labor Day week

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As we head toward the peak of the hurricane season on September 10, it was only a matter of time before we started to see some life in the tropics. There continues to be a large amount of dry air across much of the Atlantic, but the vigorous waves coming off the coast of Africa are becoming more frequent. 

There is a tropical wave working its way off the coast of Africa just south of the dry Saharan Air Layer. The ECMWF has been picking up on this for several days, along with another area over the Leeward Islands.

The wave currently moving over the Leeward Islands is embedded in an area of dry air but has been able to maintain its convection and wall off the intrusion of dry air. It is located  north of the stronger wind shear that has been persistent much of the season in the Caribbean, which puts it in one of the few favorable locations with warm waters and low wind shear.

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The European Model (ECMWF) picked up on this tropical wave Monday night and has been consistent for several runs, suggesting slow development of this area as it moves through the Bahamas approaching the Florida coastline. 

It is important to note that while the ECMWF has been showing slow development, the GFS has not shown any noteworthy development other than an increase in tropical showers for the state.

The ensemble members of the ECMWF are now putting this area at about a 56-percent chance of tropical depression development as it moves over Florida and into the Gulf of Mexico. A path such as this is not common, but it is not unprecedented. 

Tropical Storm Jerry in 1995 formed off the southeast coast of Florida, aided in part by the warm waters of the Gulf Stream. It moved onshore and northwest up the spine of the state before moving into the gulf from Citrus County. Jerry had minimal winds but brought rainfall totals of up to 10 inches in Palm Beach County. 

This wave could end up bringing heavy tropical rains to much of Florida the early part of next week -- regardless of whether this develops into a depression or not -- and will be an area that has to be monitored over the Labor Day weekend.

While we watch the progression of the tropical wave moving towards Florida, the ECMWF shows slow development of the wave moving in the eastern Atlantic. But a weakness in the Atlantic ridge will allow for more of a northward turn in the middle of the Atlantic, keeping it safely over open waters.

The waves will become more frequent across the eastern Atlantic and it looks as if later in the week there could be more activity to watch with westward-moving tropical waves showing more promise of development as we head right into the peak of the hurricane season.

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