On Friday, August 3, the low pressure area known as "System 90L" was being watched for development. It was located south of the Cape Verde Islands off the African coast. By the early evening (Eastern Daylight Time) it quickly organized. System 90L strengthened and became Tropical Storm Florence in the eastern Atlantic. Over August 4 and 5 Florence traveled west and weakened back to a tropical depression by August 6.
The AIRS instrument that flies on NASA's Aqua satellite captured these infrared images of Florence on Aug. 4-5. The AIRS image from Aug. 4 showed a larger spiraled storm. By Aug. 5 when dry air started interacting with the system the area of stronger thunderstorms had diminished and the storm had a tight, small area of strong, high, cold cloud tops of thunderstorms around the center of circulation.
Credit: NASA/JPL, Ed Olsen
After Florence became a tropical storm she ran into dry air and Saharan dust, according to the National Hurricane Center (NHC). At 5 a.m. EDT on Monday, August 6, the NHC noted "the cyclone has been devoid of deep convection for about six hours as dry air has become well embedded in the circulation."
Forecasters at the National Hurricane Center expect Florence to track west across the Atlantic and south of Bermuda. On her western track, Florence is expected to degenerate to a remnant low within the next couple of days, because wind shear will increase from the west and batter the storm. Florence became a post-tropical storm on August 6 at 11 a.m. EDT as its winds dropped to 35 mph (55 kmh). It was located near latitude 16.4 north and longitude 40.2 west. Florence is expected to weaken further over the next couple of days.
Rob Gutro | EurekAlert!
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