31.   Once we had refreshed ourselves, we ventured out into the oppressively tropical air.

32.   On Monday, humidity levels steadily mounted along the western Gulf of Mexico coast as building surface winds from the south transported tropical air inland.

33.   Pink mandevilla would lend a tropical air, too, but this is a tender vine.

34.   Scattered thunderstorms will erupt near the Gulf Coast, where surging tropical air displace less humid air.

35.   Severe thunderstorms will also boil up across parts of the western Gulf states as a potent disturbance interacts with tropical air.

36.   Sultry weather from the South will direct tropical air into the Middle Atlantic region.

37.   Sultry weather will cover the South as tropical air flows north from the Gulf of Mexico.

38.   The boundary between the cool air mass to the north and tropical air to the south will be the focus for showers and thunderstorms from Virginia to Oklahoma.

39.   The boundary between tropical air and cool air will stretch from the Middle Atlantic coast into the Middle West.

40.   The boundary between cool Pacific air across the northern half of the nation and record warm tropical air over the South will stretch from New Jersey to Kansas.