Imelda’s sudden right turn was driven by a combination of steering currents and a big assist from Hurricane Humberto. Their counter-clockwise rotation around that midpoint – roughly 300 miles northeast of Imelda and southwest of Humberto – forced Imelda into a sharp shift eastward. In the Atlantic, storms are often spaced far apart—say, one off Africa and another in the Caribbean—or they’re disrupted quickly by land or jet stream troughs. In this case, we saw a rare "Hurricane Hoedown," as the two systems do-si-do’d their way out to sea. Once Humberto dissipates, Imelda will absorb the leftover tropical moisture and continue its trek across the Atlantic.