These storms I documented yesterday over the Painted Desert in NE Arizona will probably be some of the most unique of the year. The air temperature at the time of this shot was 45, with a dewpoint in the upper 20s and a stiff north wind, resulting in wind chills down into the 30s. Yet, I was looking at this sky, which resembled a monsoon sky in July!

How did thunderstorms form in this environment? If you look at the sounding on the left, it shows frigid temperatures aloft. So, despite what would seem to be meager moisture and air temperatures, scattered thunderstorms developed on the backside of a low-pressure system that had moved east into New Mexico.