It is believed that the severity of the storm hitting Canada on October 15, 1954 was due to the addition of an independent development to the dying hurricane Hazel. The problem of forecasting this event is discussed in the light of forecasts made at the time. The presence of a secondary development is verified.

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1 Present affiliation: University of Arizona.

2 The research reported in this article has been sponsored by the Geophysics Research Directorate of the U. S. Air Force Cambridge Research Center under contract No. AF 19(604)1293.