General properties of the Canadian English vowel space are derived from an experimental-acoustic study of vowel production underway in Winnipeg, Manitoba. Comparing the preliminary Winnipeg results with similar data from General American English confirms previously described generalizations for Canadian English: the merger of low-back vowels, the relative retraction of /æ/, and the relative advancement of /u/ and /Ʊ/. However, a similar comparison of the Winnipeg sample with comparable Southern California data disputes the accuracy of the claim that Canadian Shift (Clarke et al. 1995) is a feature of ‘general’ Canadian and Californian English. An acoustic analysis uncovers subtle phonetic distinctions that make possible a more precise characterization of Canadian Raising: rather than only adjusting the height of the nucleus, Winnipeg speakers produce a directional shift in both the nucleus and offglide of the diphthongs /aɪ, aƱ/; this process applies to all three diphthongs (including /oɪ/).