I am very cautious when hiking during thunderstorm season, especially above treeline where these is no protection from lightning, hail, and high winds. I’ve just had too many calls where thunderstorms have caught me out in the open and scared me half to death with their fury. While I can peacefully sleep through storms like this while camping at night, it’s a totally different matter to be caught out in the open with no place to hide.
While there is a chance that you’ll get beaned by a baseball chunk of ice during a hailstorm, hit by flying tree branches, swept away in a flash flood (the number one cause of thunderstorm related deaths),or zapped by ground current lightning which can travel hundreds of feet from the point of impact over roots and rocks, the best way to avoid these dangers is to avoid thunderstorms altogether.
Thunderstorm Warning Signs
The best way to avoid thunderstorms is to heed weather forecasts (if you have access to them) and sit out storms or hike during the hours when they’re least likely to occur. With a little experience, you can also accurately forecast the weather by keeping a close eye on cloud formations, wind speed, wind direction, or barometric pressure when hiking out in the open where the threat of lightning and hail is the greatest.
For example, in New England (especially in the White Mountains and along the Vermont, New Hampshire, and Maine sections of the Appalachian Trail) thunderstorm activity is highly seasonal, occurring most frequently from June through August. If you plan on hiking or backpacking in the area during these months, make sure you build a bad weather day or two into your schedule in case you need to abort a hike because of dangerous weather. Local hikers do this all the time, because if an emergency arises where you do need search and rescue help, no one is going to come until the storm is over.
Most summer thunderstorms occur between noon and midnight when the sun has had a chance to heat up the warm moist air which rises to form a thunderstorm. If you do need to hike through an exposed or open area, it’s best to get an early morning start so you can get through it before the early afternoon hours before most storms reach a mature stage of thunderstorm formation.
If you can see the sky, you can also monitor possible thunderstorm activity by looking for large puffy cumulus clouds on the horizon. If they start growing very tall or anvil-shaped, you can expect a major thunderstorm. For example, I’ve been on hikes through highly exposed alpine areas where I’ve been able to see such clouds approaching me from 30 miles away. The sight of these clouds encouraged me to hike a lot faster and to get below treeline before they arrived and let loose their full wrath!
If you remain alert to the weather when hiking and backpacking, there’s no reason you can’t avoid being caught in the open when a thunderstorm hits. Most thunderstorms only last for 30 minutes, and you can simply wait them out before proceeding with your hike.
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