Heat Exhaustion is characterized by pale, cool and damp skin. Remove the person from direct sun, loosen restrictive clothing, and provide cool liquids. Heat Stroke is characterized by hot, dry, red skin. This is a true emergency. Get the person out of the sun and immediately begin cooling the person's body with damp clothes and fanning.
Thunderstorms can cause flash flooding which can quickly fill sandy washes.
Check the weather forecast before starting your hike and do not camp in low lying areas or washes if rain is a possibility. There is a good chance that you will NOT encounter any of the park's poisonous animals. However shaking out clothing will help avoid scorpions, spiders, and centipedes. Avoid placing hands and feet out of sight on ledges, in rock piles, or animal burrows. Rules and Regulations Collection of plants, fossils, petrified wood, archeological material or other objects is strictly prohibited.