Atmospheric thermodynamics

The Environment Ministry is calling on people around the country not to use fireplaces or solid fuel and biomass stoves on Friday due to the likelihood of high levels of hazardous air pollution forming.

The ministry said that conditions of no winds and thermal inversion are conducive to airborne particulate matter pollution.

Code Yellow has been issued throughout Bulgaria due to the high temperatures expected to range between 33 C and 38 C, Thursday.

The thermometers in Sofia will show 34 C, the National Institute for Meteorology and Hydrology reports.

Weather in the mountains will be sunny and warm with maximum temperatures of 27 C at 1200 m, and at 2000 – about 21 C.

The National Weather Administration (ANM) on Wednesday issued code yellow of scorching heat warning valid for all counties on Aug. 13-14.

In addition, temperatures will move as high as 35 to 37 degrees Celsius, even 38 degrees in some areas, while the temperature-to-humidity index will exceed the critical threshold of 80.

The heatwave over Bulgaria will last till the weekend when a cold front would cool off the air, reports the National Institute for Meteorology and Hydrology. 

The cold snap will be brief, but temperatures will drop by around 10 degrees. Next Monday the heat will return.

The National Weather Forecaster (ANM) on Monday issued a sizzling heat announcement effective Tuesday through Thursday all over Romania's territory.

Thus, between August 12 and 14, the heat wave will increase gradually throughout the country, and temperatures will hit scorching heights.