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

 Site No. 276, Approximate Location: 45.00 N. Latitude, 86.00 W. Longitude
 Site Name  Manitou Passage                on Lake Michigan     
 ----------------------------------------------------------------------------------------------------------
 Year Mo Da   T1   T2   C1  T1C1 T2C1  C2  T1C2 T2C2  C3 T1C3 T2C3  IMAGE   Supplemental Information
 ----------------------------------------------------------------------------------------------------------
 1933  4  4   -1   -1   FD   -1   -1   DI   -1   -1       -1   -1  224.TIF                                   

 1934  4  3   -1   -1   FD   -1   -1   DI   -1   -1       -1   -1  232.TIF                                   

 1940  3 18   -1   -1   OW   -1   -1        -1   -1       -1   -1  279.TIF   NORTH TO GRAYS REEF             

 1943  4 26   -1   -1   HF   -1   -1   BK   -1   -1       -1   -1  306.TIF   TO HOG ISLAND                   

 1944  3 27   -1   -1   OW   -1   -1        -1   -1       -1   -1  311.TIF                                   

 1948  3 29   -1   -1   OW   -1   -1        -1   -1       -1   -1  338.TIF   NORTH BEYOND FOXES              
 ----------------------------------------------------------------------------------------------------------
 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.