These types of rocks are free of pores and cracks in which moisture can hide. Flash floods are common after heavy rains in the Ozarks. A dry creek can come up in minutes and become very dangerous. Flash floods are also a hazard in underground caves. Caves are created by flowing water and some act as natural storm sewers by collecting water from sinkholes and fractures in surface bedrock.
Storms can also produce lightning, hail, and high winds.
When in a storm, try to take cover and stay away from high points. These points are more likely to be struck by lightning and tend to be hit with more wind than other locations. When enjoying the outdoors, keep an eye on the weather. When going into caves that fill with water, make sure there is no chance of rain since there is no way to keep tabs on the weather once underground. If in a canoe on a river, pull out of the river during a lightning storm and try to find cover.