The Atlantic basin remains very quiet and tropical development is not expected over the next several days. There are currently several waves moving across the Atlantic and through central America. These waves will continue on a westward trajectory and will move at 6-8 degrees longitude per day. There is another tropical wave that will emerge off the coast of west Africa overnight tonight.
The reason these waves are having a hard time developing further is twofold. The first reason is the expansive area of dry and dusty air that encompasses most of the eastern Atlantic. There is also drier air across portions of the western Atlantic and through the Caribbean. This dry air is leading to reduced shower and thunderstorm activity with these waves.
The second reason why we are not seeing development is the strong wind shear that is in place over much of the basin. Strong shear remains in place over the Caribbean and this is inhibiting any development in this part of the basin. The reason there is so much shear is because of an anomalously strong area of high pressure in the east-central and western Atlantic. Because of the adverse conditions, development is not expected for the next several days.
By AccuWeather Senior Meteorologist Michael Leseney
000 ABNT20 KNHC 220505 TWOAT Tropical Weather Outlook NWS National Hurricane Center Miami FL 200 AM EDT Sat Jul 22 2017 For the North Atlantic...Caribbean Sea and the Gulf of Mexico: Tropical cyclone formation is not expected during the next 5 days. $$ Forecaster Pasch
The former tropical storm weakened after crossing the Windward Islands but will spread downpours westward across the southern Caribbean Sea this week.
A new tropical storm has developed in the Atlantic Ocean, becoming the fourth named tropical system of the 2017 Atlantic Hurricane Season.
While redevelopment of Tropical Depression Four remains unlikely, the shell of the system will spread showers and thunderstorms across South Florida prior to the end of the week.
Robust showers and thunderstorms from the former Tropical Depression Four will affect the Florida Peninsula during the latter part of this week.
On the heels of former Tropical Depression Four, another tropical wave has emerged off Africa. However, obstacles lie in its path to becoming the Atlantic’s next tropical depression.
Tropical Depression Four weakened into a batch of disorganized showers and thunderstorms and will pass north of the Leeward Islands this weekend.
Tropical Depression Four has formed over the Atlantic Ocean and may remain a concern through the middle of July as it takes a path near the Lesser Antilles then near the East Coast of the United States.
The lull in tropical activity in the Atlantic Basin may come to an end this week in the central Atlantic Ocean.