This week’s image was taken this evening of some severe thunderstorms over southeastern Colorado.
The satellite image shows the overshooting tops from the most severe storms and a large anvil. The anvil extends in all directions because the upper-level winds are weaker than we see in the spring. Spring severe thunderstorms often form where there is stronger upper-level winds that blow the anvil material downwind. A really strong updraft will force anvil upwind, sometimes called a “back-sheared” anvil. In this case, the storm looks to have grown in all directions.
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Source: College of DuPage – Meteorology