- The sky darkens as gathering storm clouds build
- W991057Z
- The sky darkens as gathering storm clouds build into a majestic thunderstorm down a lonely road. Under the black base of this high-precipitation supercell severe storm is a mass of very low clouds almost dragging on the ground. This wall cloud is where warm air ahead of the rain is drawn efficiently upward into the storm’s powerful updraft. Just behind it, the air now filled with rain and large hailstones, descends in a dark gray curtain.
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