Though not as jaw-dropping spectacular as another thunderstorm collision I caught on slide film 34 years before, this still was part of a fascinating burst of lightning I noticed in an area where two thunderstorms (one represented by the core at middle and right, the other by an updraft at left) were colliding. These thunderstorms soon merged with others to the north and west, leading the entire convective mass to heave forth a large area of outflow that caused a striking haboob in the Tucson area.
1 NE Patagonia AZ (10 Jul 21) Looking E
31.5583, -110.7349