Climatology of back trajectories from Israel based on synoptic analysis.

The Air Resourcee laboratory's trajectory model was used to calculate five-day back trajectories from Israel at the 850 mb pressure surface for five years (January 1978-December 1982). These air flow patterns were evaluated in conjunction with seasonal weather types for which a detailed synoptic analysis and classification of the weather situations prevailing during these air flow patterns has been performed. A significant difference between the typical seasonal trajectories is pointed out. Trajectories reach Israel from five major source regions: 1) northwest Europe; 2) eastern Europe; 3) Saudi Arabia and Jordan; 4a) North African coast; and 4b) inland North Africa.-Author