Assertion: cumulonimbus cloud | /r/HasProperty | accompanied by lightning
Facets:
value: often
type: TEMPORAL
Source sentences:
text: It is often accompanied by lightning, thunderstorms, and severe tornadoes.
text: Well known as thunderstorm clouds, cumulonimbus clouds are frequently accompanied by heavy showers, lightning, thunder, and sometimes hail, tornadoes or strong, gusty winds.
text: Only cumulonimbus is accompanied by lightning, thunder, or hail; only cumulus congestus can rival the intensity of its shower -type precipitation.