A 30-year-old woman hiking on Doi Pui Luang was seriously injured when struck by lightning during a thunderstorm on Sunday evening, leading to a difficult two-hour emergency evacuation down the mountain.
Reports said she was struck by lightning about 6pm.
She was among about 20 tourists caught on the mountain by the storm while hiking near Ban Huai Hi in tambon Huai Pu Ling of Muang district.
The woman, a Thai identified only as Pattaraphon, was left unconscious with critical injuries, according to local news reports. Her companions gave her cardiopulmonary resuscitation.
A rescue team carried the injured woman down the mountain in heavy rain, the trail slippery and the footing treacherous. It took them more than two hours to reach the bottom.
Reports said the woman was responsive during the trip to Srisangwan Hospital, where she was admitted at 8.45pm. Ms Pattaraphon has serious burns and was transferred to Nakornping Hospital in Chiang Mai. She is reportedly a native of Nakhon Si Thammarat and had travelled to the North from Bangkok.
Muang Mae Hong Son chief Yutthana Jaoduree warned visitors to exercise caution during stormy weather in such circumstances. They should turn off their phones and other electronic devices, and avoid taking shelter under tall trees or in huts in open areas.
Local residents said lightning strikes were common on Doi Pui Luang at this time of year and often killed livestock.