Overnight, a cold front will bring brief showers and thunderstorms to some areas of western and central Bulgaria. 

Tomorrow, July 31, with moderate, in the Danube Plain temporarily strong northwest winds, cool air will blow in and temperatures will drop. Clouds over the country will be variable In some places there will be brief showers with thunderstorms, mainly in eastern and southern Bulgaria. There are conditions for locally intense showers and hail. There will be no precipitation in the western and central parts of the Danube Plain. The prevailing maximum temperatures will be between 27° and 32°, in Sofia around 27°. 

Over the Black Sea coast, clouds will be variable, often significant - cumulus and cumulus-rainy - over the northern coast. In places there will be brief showers with thunderstorms. Winds will be oriented from the northwest, increasing to moderate. Maximum temperatures will be 29°-31°C. The sea water temperature is 25°-26°C. The sea swell will be 2-3 with a tendency to weaken. 

Over the mountains the sky will be cloudy, with rain and thunder in many places. There will be moderate and temporarily strong northwest wind. Temperatures will drop and the maximum at 1200 meters will be about 22°C, at 2000 meters - about 16°C.