1. Ice and snow accretion over the Ukraine Khomenko Inna, Odessa State Environmental University, Ukraine 12th EMS Annual Meeting & 9th European Conference on Applied Climatology 10 – 14 September 2012 Łódź, Poland

2. Atmospheric icing is divided into (1) precipitation icing - glaze; - wet snow; - frozen wet snow; (2) in-cloud icing - hard rime; - soft rime.

3. In order to study conditions of atmospheric icing near the surface such as glaze, soft and hard rime, snow accretion, the data for 185 stations of Ukraine are used for period of 2002-2009. Database contains temperature, wind speed and wind direction in the beginning of icing accretion and at the moment that the accretion reached maximum in the size. The database includes 18408 events.

4. Location of the cites in the Ukraine, for which the ice formation conditions are studied

5. Averaged number of icing days For the landlocked mountainous terrain such as the Donetsk ridge, the Crimean Mountains and the Carpathians the highest frequency of icing is reported (over 45 days per year).

6. Frequency distribution of atmospheric icing over the Ukraine

7. Frequency (%) of different types of icing accretion by month 1330 m

8. Frequency (%) of different icing accretion types by day time

9. Duration frequency (%) of different types of atmospheric icing The highest duration of atmospheric icing is obtained for the Donetsk ridge.

10. Accumulated frequency (%) of different icing types by mass of accretion Maximum weight of accreted ice is reported for the Plai Mountain for all type of atmosphere icing except wet snow. Maximum wet snow accretion is observed in the Zaporizhzhia station.

11. GLAZE 89% 51% Frequency distribution of surface temperature in the beginning of the atmospheric icing near the surface

12. HARD RIME 86% 33% Frequency distribution of surface temperature in the beginning of the atmospheric icing near the surface

13. SOFT RIME 70% Frequency distribution of surface temperature in the beginning of the atmospheric icing near the surface

14. WET SNOW 71% Frequency distribution of surface temperature in the beginning of the atmospheric icing near the surface

15. Frequency distribution of wind direction in the beginning of atmospheric icing near the surface The most number of hard and soft rime cases are reported under calm (soft rime 46%, hard rime 22%).

16. Frequency distribution of wind direction in the beginning of atmospheric icing near the surface for various parts of the Ukraine

17. The further steps: 1.to create new detailed classification of territory of the Ukraine, according to the atmospheric icing severity; 2.to use the obtained results for developing of probabilistic forecast of atmospheric icing over Ukraine.