This week’s image shows the interaction of a set of frontal boundaries. You can see a frontal boundary marked by the thin band of clouds behind the thicker band of clouds. Notice how, where these two merge, there is a strong thunderstorm with an overshooting top. This storm formed in around 15 minutes, according to the satellite loop.
If one were to run this entire loop, they would see that an entire line of storms fired soon after this fast-moving cold front (with the thin line of clouds) passed into the other boundary (the thicker line of clouds).
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Source: College of DuPage – Meteorology