GREAT LAKES ENVIRONMENTAL RESEARCH LABORATORY, NOAA Climate Data Modernization Project
 National Weather Service Historical Great Lakes Ice Reports for Winters 1899 - 1970

 Site No. 034, Approximate Location: 46.98 N. Latitude, 90.95 W. Longitude
 Site Name  Sand Island                    on Lake Superior     
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 Year Mo Da   T1   T2   C1  T1C1 T2C1  C2  T1C2 T2C2  C3 T1C3 T2C3  IMAGE   Supplemental Information
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 1912  3 19   24   -1        -1   -1        -1   -1       -1   -1  084.TIF                                   

 1916  3 28   -1   -1   OW   -1   -1        -1   -1       -1   -1  116.TIF                                   

 1918  4  2   -1   -1   SO   -1   -1   RT   -1   -1       -1   -1  132.TIF                                   

 1955  3 21    9   12   SC    4    6        -1   -1       -1   -1  394.TIF                                   
 1955  3 21   24   -1   CL   -1   -1   SC    1   12   WI  -1   -1  394.TIF   LAKE                            

 1958  4  7   -1   -1   OW   -1   -1        -1   -1       -1   -1  422.TIF                                   

 1961  4 10   -1   -1   OW   -1   -1        -1   -1       -1   -1  446.TIF   TO UPPER ENTRY KEW. WATERWAY    
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 Ice thickness is in inches, -1 = no thickness reported, see report for ice conditon codes.
 T1 = ice thickness or part of a range if T2 is present,  C1 = primary condtion of ice.
 T1C1 = thickness of C1 or part of range if T2C1 is presnet.
 C2, T1C2, T2C2, C3, T1C3, T2C3 are secondary and ternary ice conditon and condition thickness.