NOAA's GOES-East satellite on Sept. 15 at 10:45 a.m. EDT (1445 UTC) showed Tropical Depression 12 in the eastern Atlantic Ocean off the west coast of Africa.
NOAA
2016-09-15
<a rel="nofollow" class="external free" href="https://www.nasa.gov/feature/goddard/2016/td12-atlantic-ocean">https://www.nasa.gov/feature/goddard/2016/td12-atlantic-ocean</a>