Stour (i) BrE AmE stʊə AmE stʊ ə r , (ii) BrE AmE ˈsta ʊ ‿ə AmE ˈstaʊ‿ ə r , (iii) BrE AmE ˈstə ʊ ə AmE \ ˈstoʊ ə r —The river in Suffolk and Essex is (i), as, usually, is that in Kent. That in Warwickshire is (ii) or (iii). Others are mostly (ii).
STOUR
Meaning of STOUR in English
Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012