Hiking in southern Nevada does have some natural dangers. The monsoon season, which runs from late July to mid-September, consists of thunderstorms accompanied with lightning. It's most prevalent in Mt. Charleston. Be off the peaks by noon. Why? Because thunderstorms do not normally start until the afternoon.
1. Precautions if caught in a lightning storm:
Get off of peaks and ridgelines.
Stay out of shallow caves.
Stay away from water. If a trail turns into a stream, stay off.
If you're hiking with a group, spread out.
Stay away from tall objects (trees).
If you feel charged, squat down on non-conductive material. Your backpack is normally a good choice.
The best rule of thumb is to watch the sky and listen to the weather forecast the night before hiking. Many times the sky looked threatening, but not a drop of rain fell or a flash of lightning was seen.
2. Flash Floods
Although it doesn't rain often in southern Nevada, when it does flash floods occur in the washes in Red Rock Canyon and Lake Mead. Stay out of washes when it rains.
3. Darkness
Plan your hikes so you do not descend in the dark. If you're on a trail, this is not too big of a problem, provided you brought a flashlight. However, you don't want to descend a scrambling route in the dark. See the chart for the time of day when the sun sets.
4. Rock fall
When hiking be careful not to dislodge a rock sending it tumbling down on hikers below. If you do dislodge a rock, yell "rock" so hikers below can get out of the way.