GREAT LAKES ENVIRONMENTAL RESEARCH LABORATORY, NOAA Climate Data Modernization Project National Weather Service Historical Great Lakes Ice Reports for Winters 1899 - 1970 Site No. 232, Approximate Location: 45.77 N. Latitude, 85.18 W. Longitude Site Name Grays Reef on Lake Michigan ---------------------------------------------------------------------------------------------------------- Year Mo Da T1 T2 C1 T1C1 T2C1 C2 T1C2 T2C2 C3 T1C3 T2C3 IMAGE Supplemental Information ---------------------------------------------------------------------------------------------------------- 1938 3 21 -1 -1 OW -1 -1 -1 -1 -1 -1 263.TIF SOUTH OF LIGHTHOUSE 1938 3 21 -1 -1 LF -1 -1 -1 -1 -1 -1 263.TIF SOUTH OF LIGHT 1940 3 11 -1 -1 OW -1 -1 BV -1 -1 -1 -1 278.TIF 1940 4 1 -1 -1 IP -1 -1 BV -1 -1 -1 -1 281.TIF WESTWARD 1940 4 8 -1 -1 FD -1 -1 -1 -1 -1 -1 282.TIF 1943 4 12 -1 -1 OW -1 -1 -1 -1 -1 -1 304.TIF 1944 3 13 -1 -1 HF -1 -1 -1 -1 -1 -1 309.TIF 1944 3 20 -1 -1 SW -1 -1 -1 -1 -1 -1 310.TIF TO ISLE AUX GALETS 1944 4 10 -1 -1 HF -1 -1 BK -1 -1 -1 -1 313.TIF (CUT) 1944 4 10 -1 -1 FD -1 -1 SW -1 -1 -1 -1 313.TIF TO WHITE SHOAL 1944 4 17 -1 -1 IP -1 -1 -1 -1 -1 -1 314.TIF 1945 3 26 -1 -1 OW -1 -1 -1 -1 -1 -1 316.TIF 1945 3 26 -1 -1 LF -1 -1 SW -1 -1 -1 -1 316.TIF SOUTHWARD 1945 3 26 -1 -1 HF -1 -1 DI -1 -1 SW -1 -1 316.TIF NORTHWARD 1946 3 25 -1 -1 LI -1 -1 DI -1 -1 -1 -1 321.TIF SOUTHWARD 1947 2 19 480 600 WI -1 -1 -1 -1 -1 -1 324.TIF 1947 3 3 -1 -1 WI 480 600 -1 -1 -1 -1 326.TIF PASSAGE AND EASTWARD 1947 3 31 -1 -1 SO -1 -1 -1 -1 -1 -1 330.TIF PASSAGE 1947 4 7 -1 -1 LI -1 -1 BV -1 -1 -1 -1 331.TIF PASSAGE 1947 4 14 -1 -1 OW -1 -1 BV -1 -1 -1 -1 332.TIF PASSAGE 1948 3 22 -1 -1 WI -1 -1 -1 -1 -1 -1 337.TIF 1949 2 28 -1 -1 FD -1 -1 -1 -1 -1 -1 526.TIF 1949 3 14 -1 -1 OW -1 -1 -1 -1 -1 -1 343.TIF 1949 3 28 -1 -1 IP -1 -1 RT -1 -1 SW -1 -1 347.TIF PASSAGE 1950 3 20 -1 -1 SW -1 -1 WI -1 -1 -1 -1 352.TIF 1950 3 27 -1 -1 WI -1 -1 SW -1 -1 -1 -1 353.TIF 1950 4 3 -1 -1 OW -1 -1 BV -1 -1 -1 -1 354.TIF SOUTHWARD 1950 4 10 -1 -1 OW -1 -1 BV -1 -1 -1 -1 355.TIF SOUTHWARD 1950 4 17 -1 -1 OW -1 -1 BV -1 -1 -1 -1 356.TIF SOUTHWARD 1950 4 17 -1 -1 OW -1 -1 -1 -1 -1 -1 356.TIF PASSAGE 1951 3 5 -1 -1 HF -1 -1 -1 -1 -1 -1 360.TIF 1951 3 12 -1 -1 SW -1 -1 -1 -1 -1 -1 361.TIF TO ISLE AUX GALETS & SOUTHWARD 1951 3 19 -1 -1 OW -1 -1 BV -1 -1 -1 -1 362.TIF SOUTHWARD 1951 3 26 -1 -1 SW -1 -1 -1 -1 -1 -1 363.TIF 1951 4 2 -1 -1 RT -1 -1 SW -1 -1 -1 -1 364.TIF THROUGH PASSAGE 1951 4 9 -1 -1 IP -1 -1 -1 -1 -1 -1 365.TIF TO ISLE AUX GALETS 1952 3 17 -1 -1 OW -1 -1 BV -1 -1 -1 -1 370.TIF PASSAGE 1952 3 17 -1 -1 LI -1 -1 -1 -1 -1 -1 370.TIF LAKE: SOUTHWARD 1952 3 24 -1 -1 IP -1 -1 -1 -1 -1 -1 371.TIF PASSAGE 1952 4 7 -1 -1 SO -1 -1 -1 -1 -1 -1 373.TIF CHANNEL 1952 4 14 -1 -1 LF -1 -1 -1 -1 -1 -1 374.TIF TO ISLE AUX GALETS 1953 3 2 -1 -1 SO -1 -1 -1 -1 -1 -1 528.TIF 1953 3 16 -1 -1 IP -1 -1 SW -1 -1 RT -1 -1 378.TIF PASSAGE 1953 3 23 -1 -1 OW -1 -1 -1 -1 -1 -1 379.TIF 1954 3 1 -1 -1 LI -1 -1 -1 -1 -1 -1 381.TIF 1954 3 15 -1 -1 SW -1 -1 -1 -1 -1 -1 383.TIF PASSAGE 1954 3 22 -1 -1 LI -1 -1 -1 -1 -1 -1 384.TIF PASSAGE 1954 3 29 -1 -1 OW -1 -1 -1 -1 -1 -1 385.TIF PASSAGE 1955 3 14 1 18 CL -1 -1 -1 -1 -1 -1 393.TIF 1955 3 21 -1 -1 LF -1 -1 NI -1 -1 -1 -1 394.TIF PASSAGE 1955 3 28 -1 -1 SO -1 -1 -1 -1 -1 -1 395.TIF 1956 2 27 -1 -1 IP -1 -1 BV -1 -1 -1 -1 397.TIF PASSAGE 1956 2 27 20 -1 SW -1 -1 -1 -1 -1 -1 397.TIF TO ISLE AUX GALETS 1956 3 5 20 -1 IP -1 -1 BV -1 -1 -1 -1 399.TIF PASSAGE 1956 3 12 -1 -1 NI -1 -1 DI -1 -1 SC 2 3 401.TIF 6 PASSAGE 1956 3 19 -1 -1 NI -1 -1 SW -1 -1 -1 -1 402.TIF TO ISLE AUX GALETS 1956 4 2 -1 -1 LF -1 -1 -1 -1 -1 -1 404.TIF PASSAGE 1957 3 25 -1 -1 SO -1 -1 -1 -1 -1 -1 413.TIF PASSAGE 1958 3 10 -1 -1 LF -1 -1 DI -1 -1 -1 -1 418.TIF 1958 3 10 -1 -1 OW -1 -1 BV -1 -1 -1 -1 418.TIF PASSAGE: BEYOND WHITE SHOAL 1958 3 17 -1 -1 DI -1 -1 -1 -1 -1 -1 419.TIF PASSAGE 1958 3 24 -1 -1 OW -1 -1 -1 -1 -1 -1 420.TIF PASSAGE: FROM NEAR WHITE SHOAL 1958 3 31 -1 -1 OW -1 -1 -1 -1 -1 -1 421.TIF PASSAGE: 2Mi OFF WHITE SHOAL 1958 4 7 -1 -1 OW -1 -1 BV -1 -1 -1 -1 422.TIF PASSAGE 1959 4 6 20 -1 RT -1 -1 -1 -1 -1 -1 430.TIF PASSAGE: TO ISLE AUX GALETS 1959 4 13 -1 -1 IP -1 -1 -1 -1 -1 -1 431.TIF PASSAGE: TO ISLE AUX GALETS 1960 2 29 -1 -1 LI -1 -1 -1 -1 -1 -1 522.TIF PASSAGE: LIGHTHOUSE SOUTHWARD 1960 3 21 -1 -1 OW -1 -1 BV -1 -1 -1 -1 436.TIF PASSAGE: WHITE SHOALS SOUTHWAR 1960 4 4 -1 -1 OW -1 -1 -1 -1 -1 -1 438.TIF PASSAGE 1961 2 27 -1 -1 SW -1 -1 -1 -1 -1 -1 440.TIF PASSAGE 1961 3 6 -1 -1 LI -1 -1 DI -1 -1 -1 -1 441.TIF PASSAGE 1961 3 20 -1 -1 OW -1 -1 -1 -1 -1 -1 443.TIF PASSAGE 1962 3 5 12 -1 FS -1 -1 CL -1 -1 SC -1 -1 448.TIF THROUGH STRAITS TO POES REEF 1962 3 12 24 36 FD -1 -1 FS -1 -1 -1 -1 449.TIF TO ISLE AUX GALETS 1962 4 16 -1 -1 DI -1 -1 -1 -1 -1 -1 454.TIF PASSAGE 1962 4 23 -1 -1 DI -1 -1 -1 -1 -1 -1 455.TIF PASSAGE 1963 4 15 -1 -1 SO -1 -1 BV -1 -1 RT -1 -1 463.TIF PASSAGE 1964 3 2 18 24 SO -1 -1 WI 180 -1 -1 -1 466.TIF PASSAGE 1964 3 9 -1 -1 FD -1 -1 SO -1 -1 DI -1 -1 467.TIF PASSAGE 1964 3 9 -1 -1 SW -1 -1 -1 -1 -1 -1 467.TIF TO ISLE AUX GALETS 1964 3 16 1 12 HF -1 -1 DI -1 -1 SW -1 -1 468.TIF PASSAGE 1964 3 23 -1 -1 OW -1 -1 -1 -1 -1 -1 469.TIF PASSAGE 1964 3 30 -1 -1 IP -1 -1 SW -1 -1 -1 -1 470.TIF PASSAGE: TO ISLE AUX GALETS 1964 4 6 -1 -1 DI -1 -1 -1 -1 -1 -1 471.TIF PASSAGE: S OF CROSS VILLAGE 1964 4 13 -1 -1 OW -1 -1 -1 -1 -1 -1 472.TIF PASSAGE: TO BEYOND WHITE SHOAL 1965 3 22 -1 -1 SO -1 -1 DI -1 -1 BV -1 -1 477.TIF PASSAGE 1965 4 5 -1 -1 DI -1 -1 SO -1 -1 -1 -1 479.TIF PASSAGE 1966 3 21 10 12 DI -1 -1 PN -1 -1 RT -1 -1 486.TIF TO WHITE SHOAL 1967 4 10 6 12 DI -1 -1 RT -1 -1 -1 -1 495.TIF N OF REEF (60% ICE COVER) 1968 3 18 -1 -1 BK -1 -1 RT -1 -1 -1 -1 498.TIF S OF REEF 1968 3 25 -1 -1 PN -1 -1 NI -1 -1 -1 -1 499.TIF S OF REEF 1970 3 3 -1 -1 SW -1 -1 -1 -1 -1 -1 518.TIF S OF REEF 1970 3 31 -1 -1 DI -1 -1 SW -1 -1 -1 -1 514.TIF TO PYRAMID POINT ---------------------------------------------------------------------------------------------------------- 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.