Assertion: cumulonimbus cloud | /r/RelatedTo | lightning
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Cumulonimbus is a heavy and dense cloud of considerable vertical extent in the form of a mountain or huge tower, often associated with heavy precipitation, lightning and thunder.
text: Cumulonimbus clouds are associated with extreme weather such as heavy torrential downpours, hail storms, lightning and even tornadoes.