Amarillo Solstice Supercell

21 June 2004

GOES Visible Satellite Loop

This loop runs from 2015Z (3:15 p.m. CDT June 21) to 0202Z (9:02 p.m. MDT June 21), roughly every 15 minutes. The loop has 20 frames totalling roughly 1.25 MB; so it may a few minutes to load on a slow connection. Once loaded, you can stop the loop, go to the beginning, then step forward frame-by-frame.

A thunderstorm formed near the beginning of the loop in the western Texas Panhandle, on an inflection point where two curving low cloud lines came together, and just on the north side of a small band of high cirrus clouds. Those cloud lines probably represent the cold front and outflow boundary intersection on the surface analysis. This storm quickly weakened with its remains moving rapidly northeastward. Another cumulonimbus cloud erupted in the same area as the original -- again, close to the cold front and outflow boundary intersection. This became the supercell which devastated parts of the Amarillo area, moving southward and southeastward through the air mass between the outflow boundary and cold front. The huge overshooting tops, and their higher-level tier of anvil blowoff material, are easy to see near sunset, which corresponds to the last few images of the loop. At this time of day, when teh sun angle is low, shadows are longest and the contrast is greatest between different vertical cloud levels.

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