An ominous shelf cloud, the leading edge of a severe thunderstorm, dwarfs a highway construction project in Belvidere, Illinois. These low-hanging arcus clouds often precede a storm's powerful gust front, signaling the arrival of strong winds.
An ominous shelf cloud, the leading edge of a severe thunderstorm, dwarfs a highway construction project in Belvidere, Illinois. These low-hanging arcus clouds often precede a storm's powerful gust front, signaling the arrival of strong winds.

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