It looks like the picture was taken from the roof of a parking garage at Columbia Mall: https://www.google.com/maps/place/Columbia,+MD/@39.216361,-76.8613105,32a,35y,197.4h,78.81t/data=!3m1!1e3!4m5!3m4!1s0x89b7dfb06369a051:0xf0d6bd65b687635d!8m2!3d39.2037144!4d-76.8610462
From this point, the two high rise buildings on the left of the picture would be almost due south, meaning the light on the left side of the picture would be coming from the clear skies to the east and south of the line of storms. So, assuming he's using an extreme wide-angle (~10mm) lens, this picture certainly could be legit.