GREAT LAKES ENVIRONMENTAL RESEARCH LABORATORY, NOAA Climate Data Modernization Project National Weather Service Historical Great Lakes Ice Reports for Winters 1899 - 1970 Site No. 019, Approximate Location: 48.00 N. Latitude, 89.00 W. Longitude Site Name Isle Royale on Lake Superior ---------------------------------------------------------------------------------------------------------- Year Mo Da T1 T2 C1 T1C1 T2C1 C2 T1C2 T2C2 C3 T1C3 T2C3 IMAGE Supplemental Information ---------------------------------------------------------------------------------------------------------- 1935 4 2 -1 -1 FD -1 -1 DI -1 -1 -1 -1 241.TIF 1937 3 8 -1 -1 IP -1 -1 -1 -1 -1 -1 254.TIF TO ANGUS ISLAND 1937 3 15 -1 -1 IP -1 -1 -1 -1 -1 -1 255.TIF TO ANGUS ISLAND 1937 3 22 -1 -1 IP -1 -1 -1 -1 -1 -1 256.TIF TO ANGUS ISLAND 1938 3 21 -1 -1 SW -1 -1 -1 -1 -1 -1 263.TIF 1939 4 3 -1 -1 SW -1 -1 -1 -1 -1 -1 272.TIF TO ANGUS ISLAND 1940 3 4 6 -1 -1 -1 -1 -1 -1 -1 277.TIF 1940 3 11 6 -1 -1 -1 -1 -1 -1 -1 278.TIF 1941 3 10 -1 -1 FD -1 -1 DI -1 -1 -1 -1 286.TIF TO MAINLAND 1941 3 17 -1 -1 FD -1 -1 DI -1 -1 -1 -1 287.TIF TO MAINLAND 1941 3 17 -1 -1 OW -1 -1 -1 -1 -1 -1 287.TIF EASTWARD 1948 4 5 -1 -1 FD -1 -1 -1 -1 -1 -1 339.TIF 1948 4 5 -1 -1 LI -1 -1 LF -1 -1 -1 -1 339.TIF TO PORT ARTHUR 1948 4 12 -1 -1 LI -1 -1 -1 -1 -1 -1 340.TIF TO PORT ARTHUR 1950 3 13 -1 -1 BK -1 -1 SW -1 -1 -1 -1 351.TIF TO HOUGHTON & GRAND MARAIS 1951 2 26 -1 -1 HF -1 -1 -1 -1 -1 -1 359.TIF TO KEWEENAW PENINSULA (90%) 1951 3 5 -1 -1 SO -1 -1 SW -1 -1 -1 -1 360.TIF TO HOUGHTON 1951 3 12 -1 -1 HF -1 -1 SW -1 -1 -1 -1 361.TIF TO HOUGHTON 1951 3 19 -1 -1 HF -1 -1 -1 -1 -1 -1 362.TIF TO KEWEENAW PENINSULA (80%) 1951 3 26 -1 -1 HF -1 -1 -1 -1 -1 -1 363.TIF TO 15Mi OF KEWEENAW POINT 1952 3 17 -1 -1 FD -1 -1 -1 -1 -1 -1 370.TIF TO KEWEENAW PENINSULA (70%) 1952 4 7 -1 -1 HF -1 -1 -1 -1 -1 -1 373.TIF TO KEWEENAW PENINSULA 1953 2 24 -1 -1 LI -1 -1 -1 -1 -1 -1 375.TIF TO KEWEENAW PENINSULA 1953 3 2 -1 -1 BK -1 -1 -1 -1 -1 -1 528.TIF 1955 3 28 -1 -1 FD -1 -1 BK -1 -1 -1 -1 395.TIF TO WELCOME ISLANDS 1955 4 11 -1 -1 FD -1 -1 -1 -1 -1 -1 396.TIF NW SIDE OF ISLAND 1956 2 27 -1 -1 LI -1 -1 -1 -1 -1 -1 397.TIF TO KEWEENAW PENINSULA 1956 3 5 -1 -1 DI -1 -1 -1 -1 -1 -1 399.TIF TO TIP OF KEWEENAW PENINSULA 1958 3 17 4 28 -1 -1 -1 -1 -1 -1 419.TIF HARBOR ICE 1958 4 14 -1 -1 IP -1 -1 SW -1 -1 -1 -1 423.TIF TO THUNDER CAPE (50% ICE COVER 1959 3 9 -1 -1 SO -1 -1 -1 -1 -1 -1 425.TIF TO HERON BAY 1959 3 16 -1 -1 SW -1 -1 -1 -1 -1 -1 426.TIF TO TROWBRIDGE ISLAND 1959 4 13 -1 -1 OW -1 -1 -1 -1 -1 -1 431.TIF TO 10Mi SE 1959 4 20 -1 -1 OW -1 -1 -1 -1 -1 -1 432.TIF NW INTO THUNDER BAY 1960 2 29 -1 -1 FD -1 -1 SO -1 -1 -1 -1 522.TIF TO PORT ARTHUR 1960 3 28 -1 -1 OW -1 -1 -1 -1 -1 -1 437.TIF 10 TO 15Mi EAST OF SOUTHERN TI 1961 3 6 -1 -1 LI -1 -1 -1 -1 -1 -1 441.TIF TO KEWEENAW 1961 3 20 -1 -1 FD -1 -1 FS -1 -1 -1 -1 443.TIF SE END: TO PIGEON R. NORTHWARD 1961 4 3 -1 -1 SO -1 -1 -1 -1 -1 -1 445.TIF TO THUNDER BAY ENTRANCE 1962 3 12 -1 -1 SI -1 -1 SW -1 -1 -1 -1 449.TIF NEAR SHORE 1962 3 26 -1 -1 SO -1 -1 -1 -1 -1 -1 451.TIF TO MAINLAND 1963 3 25 -1 -1 OW -1 -1 -1 -1 -1 -1 460.TIF TO 15Mi SOUTH 1963 4 8 -1 -1 SW -1 -1 -1 -1 -1 -1 462.TIF TO MAINLAND 1963 4 15 -1 -1 OW -1 -1 -1 -1 -1 -1 463.TIF TO THUNDER BAY ENTRANCE 1964 3 2 -1 -1 HF -1 -1 -1 -1 -1 -1 466.TIF N SIDE OF ISLAND 1964 3 9 -1 -1 OW -1 -1 -1 -1 -1 -1 467.TIF S OF ISLAND 1964 3 9 -1 -1 OW -1 -1 -1 -1 -1 -1 467.TIF TO THUNDER CAPE 1966 3 7 -1 -1 SO -1 -1 -1 -1 -1 -1 484.TIF NW THROUGH THUNDER BAY 1966 3 7 -1 -1 SW -1 -1 -1 -1 -1 -1 484.TIF SOUTHEASTWARD 1966 3 14 -1 -1 LF -1 -1 -1 -1 -1 -1 485.TIF TO THUNDER BAY (80% ICE COVER) 1966 3 21 -1 -1 LI -1 -1 -1 -1 -1 -1 486.TIF TO THUNDER CAPE/PIE ISLAND 1967 3 6 -1 -1 SW -1 -1 -1 -1 -1 -1 490.TIF TO OFF TWO HARBORS 1967 3 20 -1 -1 FS -1 -1 -1 -1 -1 -1 492.TIF TO CANADIAN SHORE 1967 3 20 -1 -1 LI -1 -1 -1 -1 -1 -1 492.TIF TO OFF TWO HARBORS 1968 3 25 -1 -1 SW -1 -1 -1 -1 -1 -1 499.TIF TO DULUTH 1969 3 10 -1 -1 LI -1 -1 -1 -1 -1 -1 505.TIF TO THUNDER BAY 1969 3 10 -1 -1 LI -1 -1 -1 -1 -1 -1 505.TIF TO WHITEFISH BAY 1969 3 17 -1 -1 OW -1 -1 -1 -1 -1 -1 506.TIF NEARLY TO WHITEFISH BAY 1970 3 31 -1 -1 OW -1 -1 -1 -1 -1 -1 514.TIF CHANNEL: S OF ISLAND TO DULUTH ---------------------------------------------------------------------------------------------------------- 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.