GREAT LAKES ENVIRONMENTAL RESEARCH LABORATORY, NOAA Climate Data Modernization Project National Weather Service Historical Great Lakes Ice Reports for Winters 1899 - 1970 Site No. 251, Approximate Location: 45.42 N. Latitude, 86.82 W. Longitude Site Name Rock Island on Lake Michigan ---------------------------------------------------------------------------------------------------------- Year Mo Da T1 T2 C1 T1C1 T2C1 C2 T1C2 T2C2 C3 T1C3 T2C3 IMAGE Supplemental Information ---------------------------------------------------------------------------------------------------------- 1947 3 31 -1 -1 IJ -1 -1 -1 -1 -1 -1 330.TIF PASSAGE 1948 3 22 -1 -1 IP -1 -1 -1 -1 -1 -1 337.TIF 1951 3 26 -1 -1 IP -1 -1 -1 -1 -1 -1 363.TIF PASSAGE 1954 3 8 8 10 RI -1 -1 -1 -1 -1 -1 382.TIF 1954 3 15 -1 -1 SW -1 -1 -1 -1 -1 -1 383.TIF PASSAGE 1954 3 22 -1 -1 OW -1 -1 -1 -1 -1 -1 384.TIF PASSAGE 1956 3 5 -1 -1 OW -1 -1 -1 -1 -1 -1 399.TIF 1956 3 12 -1 -1 OW -1 -1 -1 -1 -1 -1 401.TIF SOUTH TO BOYER BLUFF 1956 3 19 -1 -1 NI -1 -1 SM -1 -1 SW -1 -1 402.TIF PASSAGE 1956 3 26 -1 -1 LF -1 -1 -1 -1 -1 -1 403.TIF PASSAGE 1957 2 25 -1 -1 SW -1 -1 -1 -1 -1 -1 407.TIF PASSAGE: NW TO BOYER BLUFF 1957 3 4 -1 -1 SW -1 -1 -1 -1 -1 -1 409.TIF PASSAGE: TO BOYER BLUFF 1957 3 11 -1 -1 DI -1 -1 SW -1 -1 -1 -1 411.TIF PASSAGE: TO MINNEAPOLIS SHOAL 1958 2 24 18 24 SO -1 -1 -1 -1 -1 -1 416.TIF PASSAGE 1958 3 10 -1 -1 OW -1 -1 -1 -1 -1 -1 418.TIF PASSAGE 1958 3 10 -1 -1 SW -1 -1 -1 -1 -1 -1 418.TIF N & W OF ISLAND 1958 3 24 -1 -1 SW -1 -1 -1 -1 -1 -1 420.TIF PASSAGE: TO MINNEAPOLIS SHOAL 1959 3 9 -1 -1 SW -1 -1 -1 -1 -1 -1 425.TIF PASSAGE: TO BOYER BLUFF 1959 3 9 -1 -1 OW -1 -1 -1 -1 -1 -1 425.TIF LAKE: TO 20Mi EAST OF ISLAND 1959 3 23 -1 -1 WI -1 -1 SC -1 -1 -1 -1 427.TIF PASSAGE: TO BOYER BLUFF 1959 3 30 -1 -1 HF -1 -1 DI -1 -1 -1 -1 429.TIF PASSAGE 1959 4 13 -1 -1 OW -1 -1 -1 -1 -1 -1 431.TIF PASSAGE: TO BOYER BLUFF 1960 2 19 -1 -1 OW -1 -1 -1 -1 -1 -1 523.TIF PASSAGE & LEADS TO BOYER BLUFF 1960 3 14 4 6 NI -1 -1 -1 -1 -1 -1 435.TIF PASSAGE 1961 3 13 -1 -1 LI -1 -1 BI -1 -1 -1 -1 442.TIF PASSAGE 1961 3 20 -1 -1 OW -1 -1 -1 -1 -1 -1 443.TIF PASSAGE 1961 4 10 -1 -1 OW -1 -1 -1 -1 -1 -1 446.TIF PASSAGE 1962 3 26 12 -1 FS -1 -1 CL -1 -1 WI -1 -1 451.TIF PASSAGE 1962 4 2 20 -1 -1 -1 -1 -1 -1 -1 452.TIF PASSAGE 1963 3 11 -1 -1 FS -1 -1 WI -1 -1 SC 1 -1 458.TIF PASSAGE 1963 4 8 12 20 PR -1 -1 SW -1 -1 -1 -1 462.TIF FROM 6Mi NW: TO MINNEAPOLIS SH 1967 4 3 -1 -1 OW -1 -1 -1 -1 -1 -1 494.TIF PASSAGE 1970 3 31 -1 -1 DI -1 -1 -1 -1 -1 -1 514.TIF PASSAGE ---------------------------------------------------------------------------------------------------------- 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.