By a hot and sunny day, I was driving on a dirt road, next to the Meteora, in the direction of Mount Olympus, along a dry river bed when suddenly, I saw water flowing while a few seconds earlier, there was nothing. I realized that it was a flash flood and made a U-turn as fast as possible in order to drive down faster that the front of the flood, to see it arriving. Luckily, one kilometer downstream, the road passed over the river on a small bridge and we arrived there before the flood.
The first photo shows the front of the flash flood arriving.
On the second photo, the water has now filled two arms in the river bed.
The third photo shows the full flood, at its peak.
That was actually a small flash flood : the front was not more than 10-15cm high and it did not last more than 15 minutes. Anyway, you get a strange feeling when on a clear and sunny day (once you know it, you might spot that in the background that a part of the sky was cloudy) you see such a phenomenon. In desert areas, it can occur at much larger scale and be a major life threat.
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