Cold Air Funnel Clouds

Jack R. Cooley National Weather Service, Grand Rapids, MI 49508

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Abstract

A small sample of cold air funnels occurring in Michigan are examined for the time and conditions of their existence, and a typical case is illustrated. The funnels appear to be warm season daytime events in the cold air well behind cold fronts and with a cold pool aloft. Thunderstorms or showers occur in the vicinity, but no tornado radar signatures were found. The funnels rarely touch the ground and in the few cases where damage occurred, it was very minor. They have also been observed in other parts of the United States and in Britain, although not identified specifically as cold air funnels.

Abstract

A small sample of cold air funnels occurring in Michigan are examined for the time and conditions of their existence, and a typical case is illustrated. The funnels appear to be warm season daytime events in the cold air well behind cold fronts and with a cold pool aloft. Thunderstorms or showers occur in the vicinity, but no tornado radar signatures were found. The funnels rarely touch the ground and in the few cases where damage occurred, it was very minor. They have also been observed in other parts of the United States and in Britain, although not identified specifically as cold air funnels.

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