JACKSON, Wyo — Spring and summer in the Tetons often bring afternoon thunderstorms, producing potential hazards including large hail, high winds, lightning and heavy rain in the valley.

According to the National Oceanic and Atmospheric Administration’s Storm Data, lightning is one of the leading causes of weather-related fatalities in the U.S.

A thunderstorm “warning” means be prepared – if severe weather has been reported, there is imminent danger to life or property. Be sure to prepare the house to withstand the effects of damaging wind and large hail. Keep trees and branches near the house trimmed. Before severe weather hits, secure loose objects, and close windows and doors. 

Sixty-four percent of lightning fatalities result from outdoor recreation. Remember, if thunder can be heard, lightning is close enough to strike. When adventuring outdoors, suspend a trip for at least 30 minutes after the last clap of thunder is heard.

The National Weather Service suggests seeking shelter in a building or metal-topped vehicle. Stay in a safe shelter for at least 30 minutes after hearing the last sound of thunder. For those who find themselves outside with no substantial shelter available, last-resort risk reduction tips include the following:

  • Immediately get off elevated areas such as hills, mountain ridges or peaks.
  • Immediately get out and away from ponds, lakes and other bodies of water.
  • Avoid open fields.
  • Stay away from tall, isolated trees or other tall objects. If in a forest, stay near a lower stand of trees.
  • Never lie flat on the ground.
  • If camping in an open area, set up camp in a valley, ravine, ditch or other low area. A tent offers no protection from lighting.
  • If in a group, spread out to avoid the current potentially traveling between group members.
  • Never use a cliff or rocky overhang for shelter.
  • Stay away from water, wet items (such as ropes) and metal objects (such as wire fences and power lines). Water and metal do not attract lightning but they are excellent conductors of electricity. The current from a lightning flash will easily travel for long distances.

The National Weather Service notes that the tips above slightly lessen the threat of being struck.

This story runs annually.