Assertion: cirrostratus | /r/CapableOf | descend forming altostratus clouds
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Source sentences:
text: When a warm front approaches, cirrostratus clouds become thicker and descend forming altostratus clouds, and rain usually begins 12 to 24 hours later.
text: When a warm front approaches, cirrostratus clouds become thicker and descend forming altostratus clouds, and rain usually begins 12 to 24 hours later.