As many as 112 residents of a town in the North of the Tyumen region were examined for the clinical course of vertebral basilar stroke (VBS). The latter ones occurred in 22.9% of patients with ischemic stroke, treated at the neurological hospital. The age of 66% of patients did not exceed 60 years. In 40% of cases, VBS developed within the first 5 years of the living in the Tyumen region and were dependent to a definite measure on the regional meteofactors.