Google Pixel 5 cell phone
Despite the heat wave in Utah, we've had some mixed weather come through all week. Not much rain, just a sprinkle hear and there. The main storm cloud was behind me to the east and these mammatus clouds formed, dissipated then formed again several times in just a few minutes. At times they were much larger than my phone's field of view as in this image. Always fascinating to watch these very active cloud formations.