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Air mass antarctic barometric pressure chinook closed low continental air mass diffraction dust bowl fetch fogbow hygrograph instrument flight rules (ifr) mist positive vorticity advection pre-frontal squall line ridge snow blindness stagnation area subtropical air summer undercast unstable/ instability. Absorption bow echo chemosphere condensation funnel diffluence downdraft evapotranspiration eye eye wall filling fresh water fusion gustnado heat stroke hydrologic cycle hygrograph isohel isopleth palouser