- Shelf clouds on a high-based gust front preceding high winds
- W012173Z
- Shelf clouds preceding high winds. A high-based gust front stands out as a sharp cloud line. Beyond it, the sky is choppy in the colder air. This sky does not look as menacing or potent as many lower shelf clouds, but it was followed by very high, severe straight-line winds which came on gradually behind the slow-moving boundary. Based on cloud appearances, high winds do not seem possible as there are almost no hints in the clouds. This is because bases are high enough to mask all wind effects close to the ground.
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