The Synoptic Conditions Associated to Hail Occurrence in Moldova

Abstract

Hail represents a phenomenon among other dangerous phenomena. All of these take place in the warm period of the year. Clouds which are able to generate hail’s falls are the convective cells. The agricultural sector is the most sensible in the path of hail’s falls. Moldova, where the farm sector prevails, is one the most exposed areas to damages generated by hail’s falls. Within the framework of the studied area, seen on atmospherically types movements, the most favorable in the occurrence of hail are those from North-Easterly and North-Westerly, both in the cyclonic pattern. Linked to them in the time interval studied (2000 to 2018) was recorded a frequency from North-East in the cyclonic mode (NEC) by 22.7%. Next, the North-Westerly air-mass movements in a cyclonic way (NVC) were about 21.8%. Significant weights were also during South-Westerly cyclonic (SVC) with 16.8% and Westerly cyclonic (VC) with 11.8%, respectively. The Westerly air-mass movements with its subdivisions (South-Westerly and North-Westerly) are those who generate the most severe convective developments. As a result, the North-Westerly air-masses movements in the cyclonic pattern are those who produced throughout time, the most significant dimensions of hail. In this study, we found that the sizes of hail during North-Westerly movements were between 40 and 60 mm in diameter. As a frequency, the most favorable period with hail at the ground’s level is valuable in May (29.4%), followed by June (26.1%), and July (21.8%).

Keywords

• hail
• convective cells
• cyclonic pattern
• moldova region