Mixing Ambient with Flash with NO Sun and Pouring Rain. How to

This was an amazing shoot as Katilyn and my team were caught out in the pouring rain doing a photoshoot. Overcast turned to sprinkles and sprinkles to raining and raining to pouring. Overall it was a GREAT shoot and I can t thank everyone enough for hanging in there. Neewer Pro 100 Adjustable Reflector Stand Link: Sony A7RII Sony 55mm 1. 8 Zeiss Sony 85mm 1. 8 Sony 28mm F2 Sigma 135mm 1. 8 ART Sigma 20mm F1. 4 ART Canon 80D Flashpoint Xplor 600 TTL Flashpoint Sony R2 Trigger Flashpoint Zoom LiOn R2 Speed light Mac Sports Collapsible Folding Outdoor Utility Wagon Zoom H1 am