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

 Site No. 013, Approximate Location: 48.33 N. Latitude, 89.22 W. Longitude
 Site Name  Thunder Bay Harbor, Ont.       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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 1950  3 20   30   -1   SC   12   -1   WI   -1   -1       -1   -1  352.TIF                                   

 1951  3 19   28   31   SO   -1   -1        -1   -1       -1   -1  362.TIF   TO THUNDER CAPE                 
 1951  4  2   28   32        -1   -1        -1   -1       -1   -1  364.TIF   TO 5Mi OUT                      

 1956  3  5   16   20   SC   14   -1        -1   -1       -1   -1  399.TIF                                   

 1970  3 17   23   -1        -1   -1        -1   -1       -1   -1  512.TIF                                   
 1970  4 14   -1   -1   OW   -1   -1        -1   -1       -1   -1  516.TIF                                   
 1970  4 21   -1   -1   OW   -1   -1        -1   -1       -1   -1  517.TIF                                   
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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.