A vigorous tropical wave that has emerged off the coast of western Africa is attempting to merge with an active Monsoon Trof, and is poised to become a strong tropical low or tropical cyclone while tracking west to west-northwest at a fairly low latitude.

This feature has the backing of a wide array of TC genesis models, which is not surprising given its vigor, and the favorable environment it is in, and will likely continue to be in for the better part of its voyage west.

This wave has the potential to become a serious hurricane and should be monitored closely.

While not yet Invest tagged at the time of this entry, it will likely be assigned 90L or 91L within a few days, if not sooner. (Edit: This wave has been tagged as of 8AM Aug 13, 91L. Second edit: the original wave pictured above in the far eastern Atlantic has been reassigned 92L, and the westerner-most Low center assigned 91L.).

This is where to place best guesses on this wave's development potential. The sharing of medium to long range model output is also encouraged here.

At 10:30AM Aug 17 Invest 91L has become PTC NINE and the title has been updated. And at 5PM EDT Aug 17 NINE recon has found PTC9 is now a tropical storm, Harvey. - At the 5:00PM Advisory Aug 20, Harvey was declared a remnant wave. However, the wave of Harvey is entering a favorable region for regeneration.