Assertion: cold front's air | /r/MadeOf | significant downward motion
Facets:
value: in the atmosphere
type: LOCATION
Source sentences:
text: Its source region: T for Tropical, P for Polar, A for arctic or Antarctic, M for monsoon, E for Equatorial, and S for superior air (an adiabatically drying and warming air formed by significant downward motion in the atmosphere).