Modifies a noun

• heat: The Grapes is packed tonight, causing a sweltering heat aided by the fact the crowd is wrapped up for winter.

• afternoon: On the sweltering afternoon of 29 June, at Boston's Suffolk Downs, the horse found him.

• sun: Cold water was provided and we were encouraged to drink as much as possible to avoid dehydration in the sweltering sun.

• temperature: The ship is swarming with workers in sweltering temperatures reminiscent of Puerto Belgrano in March.

• summer: If the current climate is anything to go by it look's like we are in for a sweltering summer at long last!

• weather: Plain water is recommended - even over energy drinks - as the best way to keep cool in the sweltering weather.