I've found an thrilling post on a traveler's blog I'm reading quite frequently, the Travelers Lunch Box, in which the writer Melissa is explaining how a nice-walk-on-a-sunny-day can turn into a run-for-your-lives 5 hours track at 10 mph...
Simultaneously several hundred conversations stopped, and several hundred faces turned to the sky. It was so quiet that you could hear the drops hitting the dusty ground. People looked at each other uneasily for a long moment, as if trying to assess whether this was something they should be concerned about, but with a shrug of their shoulders went back to their conversations and their lunches. I, however, hurriedly scanned the paragraph in the guidebook, which began "Flash floods are a real possibility in the Samaria Gorge, both early and late in the season, and are not to be taken lightly. In 1993 several hikers were killed when a flash flood swept down the gorge and carried them out to sea. Prospective hikers are advised to contact the gorge information hotline for current weather information." We really should have called, I chided myself, but surely if there was trouble in the forecast they would have closed the gorge, wouldn’t they? I calmed myself with the thought that it was most likely just a passing shower.
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Before you go for a track, make sure you know the weather forecast for the day, specially when hiking in places were flash-flood were seen before.