Summary:

This article presents the analysis of atmospheric circulation conditions per-taining to agricultural droughts in the Podkarpackie Province during the growing season (1901-2000). The following resource materials have been used: daily ca-lendar of atmospheric circulation types elaborated by T. Niedzwiedz for southern Poland, and growing season meteorological calendar elaborated by T. Zawora for southern Poland for the following monthly periods. The author had to determine the frequency of atmospheric circulation types for months which have been recognized by agricultural specialists as too dry (due to precipitation deficit). Drought hazard may be expressed by the following ratio: frequency of occurrence of a given circulation type during drought conditions to general frequency of circulation types. This method enabled to present detailed results. Firstly during the growing season the anticyclonic circulation type - advection of air from southwest - occurs 1,38 more frequently than the general frequency of this particular circulation type (SEa). The situation is similar for types Sa and Ea (1,35 and 1,33 respectively). When we examine the remaining values we can notice that the fre-quency coefficient for anticyclonic ridge (Ka) is equal to 1,21, whilst for anticyclonic situation with advection of air from northeast (NEa), and for central anticyclonic situation (Ca) is equal to 1,20. For anticyclonic situation with advection of air from the southwest (SWa) and north the coefficient is 1,1 and 1,05 respectively. It is also important to notice the general frequency of occurrence of these particular circulation types. The author managed to rank them in the descending order: Ka - 16,7%, Ea - 7,2%, SEa - 5,5%, NWa - 5,5%, NEa - 4,9%, Sa - 4,2%, Na - 4,1%, SWa - 3,4 % and Ca - 3,0% (refer to table 1).