More Thunder on the Horizon

Yesterday I beat the heat by driving to Mount Lemmon, in the Catalinas over a mile above Tucson. It's a different world up there, with pine and even Douglas fir forests and pleasant, cool air. In winter of course it snows; there's even a ski area there, only an hour from the city. Here's a nice developing CB, as we weather guessers call cumulonimbus clouds. CB's easier to say, I reckon.

Back on the valley floor, a bigger CB loomed to the south, with mammatus clouds, the lumps visible in the middle of the picture. They show up better when you blow up the photo. They indicate a very strong storm. This one missed us to the southwest, but we did get a brief thunderstorm at the Westward Look later.