Ice formation in the St. Joseph channel. Lake Michigan EEGLE cruise Feb. 18, 2000 Lake Guardian pre-plume survey.

Ice formation in the St. Joseph channel. Lake Michigan EEGLE cruise Feb. 18, 2000 Lake Guardian pre-plume survey.

Ice formation in the St. Joseph channel. Lake Michigan EEGLE cruise Feb. 18, 2000 Lake Guardian pre-plume survey.

Pancake ice and ball ice in the St. Joseph channel. Lake Michigan EEGLE cruise Feb. 18, 2000 Lake Guardian pre-plume survey.

Coast Guard cutter towing ship through ice.

Freighter moving through channel in ice.

Average ice cover duration on Great lakes for winters 1973-2002. Produced by R. Assel, 2004

Average date of first ice cover formation on Great lakes for winters 1973-2002. Produced by R. Assel, 2004.

Average date of last ice cover on Great lakes for winters 1973-2002. Produced by R. Assel, 2004.

MODIS image of Great Lakes snow and ice cover. Taken on February 26, 2004 at 16:40. http://modis.gsfc.nasa.gov/

U.S. Coast Guard Arctic class ice breaker 'Mackinaw'. Used in GLERL CoastWatch ice research. 1997.

U.S. Coast Guard ice breaker 'Biscayne Bay'. Used in GLERL CoastWatch ice research. 1997.

U.S. Coast Guard search and rescue helicopter. Used in GLERL CoastWatch ice research. 1996.

Lake Superior ice cover in the vicinity of Ontonagon, Michigan on February 28, 2003. Photos taken by Jill Ladwig, Editor, Univ. of Wisconsin Aquatic Sciences Center.

Lake Superior ice cover in the vicinity of Ontonagon, Michigan on February 28, 2003. Photos taken by Jill Ladwig, Editor, Univ. of Wisconsin Aquatic Sciences Center.