Assertion: thunderstorm's wind | /r/CapableOf | attain a top speed of at least 11 m/s
Facets:
Source sentences:
text: In 1962 the World Meteorological Organization (WMO) defined that to be classified as a "squall", the wind must increase at least 8 m/s and must attain a top speed of at least 11 m/s, lasting at least one minute in duration.