Monsoon Moisture

The high pressure sitting over us is moving east. This will cause upper levels winds to come from the south, bringing our way wetter air. The additional moisture will help those clouds develop into larger thunderstorms across the southern part of Utah.

weather.utah.edu

Right now, thunderstorms in the Southwest are bubbling up.

http://weather.cod.edu/satrad/

For more information about the North American Monsoon, see this post: Monsoon Convection.