http://www.foxnews.com/science/2018/...in-europe.html
Carved stones from centuries ago warn of dire conditions if the stones are found--in river beds now bare of water.
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https://www.npr.org/2018/08/24/64133...in-czech-river
Drought In Central Europe Reveals Cautionary 'Hunger Stones' In Czech River
August 24, 2018·2:01 AM ET
A lengthy drought in Europe has exposed carved boulders, known as "hunger stones," that have been used for centuries to commemorate historic droughts — and warn of their consequences.
The Associated Press reports that hunger stones are newly visible in the Elbe River, which begins in the Czech Republic and flows through Germany.
"Over a dozen of the hunger stones, chosen to record low water levels, can now be seen in and near the northern Czech town of Decin near the German border," the AP writes.
One of the stones on the banks of the Elbe is carved with the words "Wenn du mich siehst, dann weine": "If you see me, weep."