The cumulus patheticus is a reflection of the cool, unstable airmass that has taken up residence over northern Utah this week. It appears that the periods of showers will continue through the weekend, with coverage and intensity tending to be a bit stronger during the daytime and evening thanks to surface heating. A weak trough passing through Saturday morning may help get things organized as well. All in all, it's a spring-like pattern.
Then, the models bring in a ginormous ridge. There's end-to-end agreement on this pattern change whether one looks at the GFS, ECMWF, or their related ensemble modeling systems.