The radar is a very expensive instrument for detection ... and still has some erros that are very hard to correct. With some of the errors we get get "used" and recognize them easily. But other errors are less evident or less known by the forecasters, and the consequences can be important. Among these, a critical one is the "blocking" of the beam by orography or, worse, by close buildings, cranes, towers. The closer these obstacles are, more energy is stopped, and the respose from possible remote strong clouds is weaker. Lately, around the radar intalled in Bucharest, "grew" many cranes, to build the new luxury houses in Baneasa "Beverly Hills". Is normal, in this situation, to have a decrease in the radar's capability of detection.... but luxury houses are more important for some authorities.
The slopes exposed to the circulation (northern slopes of the Carpathians) received rain while the southern slopes, in the lee, experienced a diminish of cloudiness and reflectivity.
Early in the morning, a band of low clouds prevent the insolation of the land beneath. Later in the day (the image on top), this region remained stable to convection while around it the air became unstable. 
The radar is a very expensive instrument for detection ... and still has some erros that are very hard to correct. With some of the errors we get get "used" and recognize them easily. But other errors are less evident or less known by the forecasters, and the consequences can be important. Among these, a critical one is the "blocking" of the beam by orography or, worse, by close buildings, cranes, towers. The closer these obstacles are, more energy is stopped, and the respose from possible remote strong clouds is weaker. Lately, around the radar intalled in Bucharest, "grew" many cranes, to build the new luxury houses in Baneasa "Beverly Hills". Is normal, in this situation, to have a decrease in the radar's capability of detection.... but luxury houses are more important for some authorities.
