Tropical Depression 18 was expected to strengthen as it moved across the Atlantic, the National Hurricane Center said on Thursday, September 23.
The center said the depression could become a tropical storm late Thursday, and potentially a hurricane over the weekend.
The World Meteorological Organization’s list of tropical cyclone names shows that the storm would be named Sam.
Satellite imagery released on September 22 by Colorado State University’s Cooperative Institute for Research in the Atmosphere shows Tropical Depression 18 moving across the Atlantic. Credit: CIRA/CSU and NOAA/NESDIS via Storyful