Rains and high waters of rivers expected in the south of Bulgaria and the north of Greece have prompted the Environment Ministry in Sofia to issue a warning for Saturday.
Weather forecasts predict heavy showers varying between 15-25 liters per square meter in the Rila-Rhodope region and 1-5 liters in Bulgaria's north.
Rains will fall in many parts of the country, according to the National Institute of Meteorology and Hydrology with the Bulgarian Academy of Science (BAS).
Rivers are expected to swell in West and Central Bulgaria on Saturday and also in the south, where Maritsa, Arda, Mesta and Struma will be affected.
On Sunday however there is no warning of downpours, although weaker rains might fall.