Here's what Wolfe says about it: " Dark and Stormy Weather shows up in several folksong collections as 'I Don't Know Why I Love Him' and had been recorded in 1937 by the Delmore Brothers." (page 77) it was recorded at the Carter Family's last session in October 1941. I have searched for it under both titles in my copy of Vance Randolph and it's not there, but I only have the ONE volume edition; Meade says it's there in volume IV #750, pp 234-36. (He also gives North Carolina Folksong II, #168, and Haun (Mildred Haun's Master's thesis at Vanderbilt).