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Source: https://outdoors.stackexchange.com/q/13401
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

<p>I just got back from a guided walking trip to high mountains. There was one day when we encountered a thunderstorm - and the guide advised we are OK to proceed with the day's walking, instead of turning round. He gave an explanation, and I wonder if you think it is reasonable?</p>

<p>The situation was as follows: the forecast said 'possibility of thunderstorms', for just-about all the foreseeable future. We set off from our overnight stay up the valley, heading for a high mountain pass. We then heard the thunderstorm coming, staying about 1.5-3 km (1-2 miles) away from us, as deduced from timing between lightning and thunder.</p>

<p>Now, the guide said he is happy to proceed up the valley and up to the col, because </p>

<blockquote>
  <p>he was monitoring the pressure (with a gauge in his GPS), and it was stable - indicating that the storm was going remain where it was, and not migrate / descend towards us.</p>
</blockquote>

<p>Does that make sense?</p>

<p>More generally, the advice I have been given was that if you hear a thunderstorm, you unconditionally turn around and seek solid shelter (mountain hut etc.). Is that too conservative, and if so, what are the mitigating circumstances? I understand you are never 100% safe from lightning outside solid buildings.</p>