Assertion: lightning | /r/CapableOf | maintain this speed
Facets:
value: until reaching the tropopause
type: TEMPORAL
value: on a standard
type: OTHER
Source sentences:
text: the Lightning would reach Mach 0.87 (1,009 km/h) and maintain this speed until reaching the tropopause, 36,000 ft (11,000 m) on a standard day.[nb 5]