Intense heat and stubborn summer drought has withered crops and sparked wildfires in the western Balkan region, hitting Serbia and Bosnia especially hard.
Several thousand villagers in southwestern Serbia were ordered to leave their homes on Saturday, Reuters said.
Serbian villages of Miokovci and Gornja Gorevnica were "endangered", the head of the Emergencies Department said.
Saturday, a Russian firefighting aircraft arrived to bolster the effort.
Temperatures Saturday soared to 100 degrees for a third-straight day across, not only the former Yugoslavia, but right across the Balkan Peninsula to Greece, Bulgaria and Romania.
Highest temperatures in Serbia reached at least 106 degrees at Loznica. Meteorological data available to AccuWeather.com showed Belgrade hit 104 degrees.
The withering heat capped off what has thus far been an abnormally hot summer for much of Europe.
An early August heat wave yielded all-time highest temperatures in some Balkan localities, according to an online tracker of world temperature extremes.
Furthermore, the impact of the heat has been heightened by drought. Belgrade, for example, has had less than 20 percent of its normal rainfall since June 1.
While no widespread wetting rain is in the forecast, the heat will break across nearly all of the Balkan region after Sunday.
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Increases in temperature may cause localized increases in the amount of toxic mercury introduced into ecosystems, impacting wildlife and eventually the food chain.
A new surge of warm air will trigger another round of severe thunderstorms in parts of the eastern United States Wednesday and Wednesday night.
Unsettled weather will continue through midweek as showers dampen much of Germany.
Spring will get off to a slow start over much of northern Asia and in part of the Middle East, while more typical conditions are in store for most areas farther to the south and east.
After record warmth baked the eastern U.S. during the last full week of February, winter will seek its revenge during the first week of March.
Prior to midweek, severe thunderstorms with isolated tornadoes, damaging winds, downpours and hail will threaten areas from Indiana to Texas.
Millions travel to Washington, D.C., each year to catch a glimpse of the magnificent pink blossoms.