Mountain weather is a professional deceiver: a perfect dawn can become a lightning storm by 2 pm. Every experienced trekker has a story about being caught out, and the difference between a story and an emergency is preparation and decision-making. Handling bad weather is not about toughing it out — it is about reading the signs early, having the right gear, and knowing when the summit can wait.
Start Early, Turn Around on Time
In most mountain ranges, thunderstorms build in the afternoon. The classic alpine rule is to be off exposed summits and ridges by noon — plan your start so the summit happens by late morning. Set a non-negotiable turnaround time before you leave camp and honour it even when the summit is an hour away; mountains are patient, weather is not. Check the forecast the night before and the morning of, but treat it as a hint, not a promise: storms form on blue-sky forecasts too.
Read the Sky
Learn the warning signs: clouds building vertically into towering thunderheads, a sudden temperature drop, strengthening wind, and distant rumbles. The flash-to-bang method estimates a storm’s distance — count the seconds between lightning and thunder, then divide by three for kilometres (five for miles). If the gap is shrinking, the storm is approaching and you should already be moving down. Keep glancing behind you on the ascent; many trekkers are surprised by storms building in their blind spot.
If Lightning Catches You
Lightning is the most immediate danger above the treeline, where you may be the tallest object around. Get off ridges, summits and exposed high points fast, and descend below the treeline if you can. Avoid isolated trees, rock overhangs, water, and metal objects including trekking poles and packs with metal frames — set them aside from your body. If you are caught in the open with no shelter, spread your group out, crouch low on the balls of your feet with minimal ground contact (on an insulated pad or pack if possible), and wait. Do not resume until at least 30 minutes after the last thunder. No place outdoors is fully safe in a thunderstorm — these steps reduce risk, not eliminate it.
Rain, Cold and Hypothermia
Rain’s real danger is cold: water conducts heat away from your body many times faster than air, and hypothermia can set in even in mild temperatures. Carry a proper waterproof shell (jacket and trousers), not just a windbreaker, and put it on before you are soaked. If you get wet, change into dry layers as soon as you can — this is why a dry set of clothes in a waterproof bag is standard kit. Shivering, clumsiness and confusion are hypothermia warning signs; treat them as an emergency: shelter, dry clothes, warm drinks, and stop moving only once warm.
Whiteout, Wind and Rivers
In whiteout or fog, stop and navigate properly: map, compass and GPS, with a bearing taken before visibility collapsed. Mark your route on the way up so you can reverse it. In high wind, get off exposed ground and find a dip or the lee side of a ridge — never shelter under a lone tree in a lightning storm. After heavy rain, treat river crossings with extreme respect: water levels rise fast, and a crossing that was easy in the morning can be dangerous by afternoon. Unbuckle your pack’s waist belt before crossing so you can ditch it if swept, and turn back rather than risk a swollen torrent.
Practical Tips
Pack a bothy bag or emergency bivvy — they weigh almost nothing and have saved lives. Keep your phone and power bank in a waterproof pouch, but do not rely on the phone as your only navigation. Tell someone your route and expected return. And cultivate the trekker’s hardest skill: the willingness to turn around. The mountain will be there next season; the forecast does not care about your itinerary.
Arjun Mehta is the pen name behind Mountains Bliss — practical mountain-travel guides with routes, costs, seasons and safety notes, researched from real trekker discussions and cross-checked before publishing. No sponsored posts, ever.
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