Assertion: lightning | /r/CapableOf | occur near the boundary
Facets:
value: usually
type: TEMPORAL
value: between the updraft region
type: LOCATION
Source sentences:
text: As seen in the photo above, cloud-to-ground lightning usually occurs near the boundary between the updraft region (where the darkest) clouds are, and the downdraft/raining region (with the lighter, fuzzy appearance).