Orange warnings for heavy rain and atmospheric instability are in force in the Romanian counties of Alba and Brașov: up to 40 mm and more may fall within one to three hours.
Romania's national weather service warns of periods of pronounced atmospheric instability in the mountain areas, with torrential downpours, thunderstorms and the risk of hail.
Rainfall totals of 40 litres per square metre (40 mm) and more within just one to three hours are enough to flood mountain roads and swell small rivers in the Carpathians.
The warnings have been running since midday on June 11 and continue while the unstable air mass remains over the region.