With adult supervision, fill the bottom of a clean glass jar with about a 1/2 inch of hot water. Swirl the hot water along the jar's sides to warm up the glass. Take the lid and turn it upside down so it's like a bowl. Put ice on the lid and set the lid on top of jar. There will be some condensation, but no cloud yet. Have an adult light a match, blow it out, then quickly open the lid and toss match inside. Hold a piece of dark paper to the jar and look for small clouds to start forming inside. Lift the lid and allow the clouds to escape.
Set some ice on a small metal dish. Warm a glass by pouring a bit of hot water over it. Allow the metal dish to get really cold. Set the cold dish on top of the glass and watch as a cloud forms along the top. Water droplets should soon form, showing how hot and cold air create condensation, just like rain.
Show how a vortex forms by using a large jar with a lid, water, clear liquid dish soap and vinegar. You can also add some glitter or a small plastic house if you want. Fill the jar 3/4 of the way with water. Add a teaspoon of vinegar and dish soap. Add only a small amount of glitter. Close the lid and twist the jar, in a swirling motion until a vortex or small tornado forms.
When using dry ice, make sure to wear protective heavy-duty gloves. Adult supervision is required when handling the dry ice. Use a tall plastic cylinder or bowl. Set the dry ice inside using tongs or rubber gloves. Never allow dry ice to touch your skin or it will burn. Kids can pour a cup of warm water into the container and then watch the clouds form. The cloud is safe to touch as long as fingers do not get too close to the dry ice.