How old is child
Younger they are, the more concrete examples like storms and strong weather changes that take over your feelings.
Others have used a roller coaster metaphor. Or mood
thermometer with different colors indicated heat of rages, yellow for between and blue for sad and asking where are you at this time.My Bipolar, Roller Coaster, Feelings Book by Bryna Hebert (Mar 31, 2005- great reviews.