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Realtime Great Lakes Weather Data and Marine Observations

 GSLM4: NWS GravellyShoalsMI                                  
CMAN Station
Lat: 44.02°, Lon: -83.54°
Elevation: 179 m
Anemometer Height: 25 m
Related Site: NDBC

Current Time: 2026 GMT
Station Types
(Click on name to view all stations for that type)
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Lt Blue MarkerBuoys
Red MarkerCMAN & USCG Stations
Yellow MarkerShip Reports
Green MarkerSurface Airways Stations

  Change Units to: English | Metric
 Enter New DOY (001-366):  Or Today (188)
 (See also Tables for determining DOY for a given date)
View multiple days of data for this station:
Select Year and Day of Year (DOY) range:
Year (4-digits):   First Day (001-366):   Last Day (001-366):  
Additional Data Archive: NDBC Historical Data

Metadata | Description of Measurements (NDBC)
All 9s in field = missing data 

                                       Change Units to English | Metric
                         AIR   DEW WND  WND  WND CLD SOLAR   BAR    WAT  WAV  WAV
-------GMT-              TMP   PT  DIR  SPD  GST CVR  RAD    PRES   TMP  HGT  PER
YYYYDDDHHMM#ID            F     F  Deg  kts  kts  %   W/m2   inHg    F    ft   s
202518800001GSLM4   29  67.8 999.9 360 13.0 23.9 999 9999.9  29.84 99.9 99.9 99.9
202518800101GSLM4   29  67.8 999.9 360 15.9 16.9 999 9999.9  29.84 99.9 99.9 99.9
202518800201GSLM4   29  67.6 999.9 350 16.9 19.0 999 9999.9  29.84 99.9 99.9 99.9
202518800301GSLM4   29  67.3 999.9  10 16.9 19.0 999 9999.9  29.83 99.9 99.9 99.9
202518800401GSLM4   29  67.1 999.9 360 15.0 21.0 999 9999.9  29.83 99.9 99.9 99.9
202518800501GSLM4   29  66.4 999.9 350 15.9 20.0 999 9999.9  29.84 99.9 99.9 99.9
202518801001GSLM4   29  66.2 999.9 350 19.0 21.0 999 9999.9  29.84 99.9 99.9 99.9
202518801101GSLM4   29  65.5 999.9 350 19.0 22.0 999 9999.9  29.84 99.9 99.9 99.9
202518801201GSLM4   29  64.8 999.9 360 19.0 22.0 999 9999.9  29.84 99.9 99.9 99.9
202518801301GSLM4   29  64.8 999.9 350 18.1 21.0 999 9999.9  29.85 99.9 99.9 99.9
202518801401GSLM4   29  64.8 999.9 350 19.0 21.0 999 9999.9  29.86 99.9 99.9 99.9
202518801501GSLM4   29  64.2 999.9 350 20.0 21.0 999 9999.9  29.86 99.9 99.9 99.9
202518802001GSLM4   29  64.0 999.9 350 19.0 22.0 999 9999.9  29.87 99.9 99.9 99.9
202518802101GSLM4   29  63.7 999.9 340 21.0 22.0 999 9999.9  29.87 99.9 99.9 99.9
202518802201GSLM4   29  63.3 999.9 340 21.0 22.9 999 9999.9  29.88 99.9 99.9 99.9
202518802301GSLM4   29  63.1 999.9 340 22.0 23.9 999 9999.9  29.87 99.9 99.9 99.9
202518802401GSLM4   29  62.6 999.9 340 25.1 26.0 999 9999.9  29.87 99.9 99.9 99.9
202518802501GSLM4   29  62.8 999.9 340 22.9 25.1 999 9999.9  29.87 99.9 99.9 99.9
202518803001GSLM4   29  62.6 999.9 340 22.9 25.1 999 9999.9  29.88 99.9 99.9 99.9
202518803101GSLM4   29  62.6 999.9 340 21.0 23.9 999 9999.9  29.88 99.9 99.9 99.9
202518803201GSLM4   29  62.2 999.9 340 23.9 27.0 999 9999.9  29.89 99.9 99.9 99.9
202518803301GSLM4   29  62.2 999.9 340 21.0 26.0 999 9999.9  29.89 99.9 99.9 99.9
202518803401GSLM4   29  62.2 999.9 340 22.9 26.0 999 9999.9  29.88 99.9 99.9 99.9
202518803501GSLM4   29  62.2 999.9 350 20.0 25.1 999 9999.9  29.89 99.9 99.9 99.9
202518804001GSLM4   29  62.2 999.9 350 21.0 22.9 999 9999.9  29.89 99.9 99.9 99.9
202518804101GSLM4   29  62.6 999.9 340 19.0 21.0 999 9999.9  29.89 99.9 99.9 99.9
202518804201GSLM4   29  62.4 999.9 350 22.0 23.9 999 9999.9  29.89 99.9 99.9 99.9
202518804301GSLM4   29  61.9 999.9 350 20.0 25.1 999 9999.9  29.89 99.9 99.9 99.9
202518804401GSLM4   29  61.7 999.9 350 21.0 26.0 999 9999.9  29.89 99.9 99.9 99.9
202518804501GSLM4   29  61.7 999.9 350 19.0 23.9 999 9999.9  29.90 99.9 99.9 99.9
202518805001GSLM4   29  61.9 999.9 340 21.0 22.9 999 9999.9  29.90 99.9 99.9 99.9
202518805101GSLM4   29  61.9 999.9 350 20.0 22.9 999 9999.9  29.90 99.9 99.9 99.9
202518805201GSLM4   29  61.5 999.9 340 21.0 23.9 999 9999.9  29.90 99.9 99.9 99.9
202518805301GSLM4   29  61.3 999.9 350 18.1 22.0 999 9999.9  29.90 99.9 99.9 99.9
202518805401GSLM4   29  61.5 999.9 340 22.0 23.9 999 9999.9  29.90 99.9 99.9 99.9
202518805501GSLM4   29  61.5 999.9 330 19.0 22.0 999 9999.9  29.91 99.9 99.9 99.9
202518806001GSLM4   29  61.3 999.9 330 16.9 21.0 999 9999.9  29.91 99.9 99.9 99.9
202518806101GSLM4   29  61.3 999.9 330 16.9 20.0 999 9999.9  29.91 99.9 99.9 99.9
202518806201GSLM4   29  61.3 999.9 340 18.1 21.0 999 9999.9  29.91 99.9 99.9 99.9
202518806301GSLM4   29  61.7 999.9 340 19.0 21.0 999 9999.9  29.90 99.9 99.9 99.9
202518806401GSLM4   29  62.1 999.9 340 15.9 20.0 999 9999.9  29.91 99.9 99.9 99.9
202518806501GSLM4   29  61.7 999.9 340 18.1 21.0 999 9999.9  29.91 99.9 99.9 99.9
202518807001GSLM4   29  61.7 999.9 350 14.0 18.1 999 9999.9  29.91 99.9 99.9 99.9
202518807101GSLM4   29  61.5 999.9 340 14.0 16.9 999 9999.9  29.92 99.9 99.9 99.9
202518807201GSLM4   29  61.5 999.9 340 14.0 16.9 999 9999.9  29.92 99.9 99.9 99.9
202518807301GSLM4   29  61.3 999.9 340 11.1 15.0 999 9999.9  29.93 99.9 99.9 99.9
202518807401GSLM4   29  61.3 999.9 330  9.9 14.0 999 9999.9  29.93 99.9 99.9 99.9
202518807501GSLM4   29  61.2 999.9 310  9.9 12.1 999 9999.9  29.93 99.9 99.9 99.9
202518808001GSLM4   29  61.0 999.9 330 14.0 15.9 999 9999.9  29.93 99.9 99.9 99.9
202518808101GSLM4   29  61.0 999.9 330 12.1 15.9 999 9999.9  29.93 99.9 99.9 99.9
202518808201GSLM4   29  61.0 999.9 320 11.1 14.0 999 9999.9  29.93 99.9 99.9 99.9
202518808301GSLM4   29  60.8 999.9 310 11.1 13.0 999 9999.9  29.93 99.9 99.9 99.9
202518808401GSLM4   29  60.6 999.9 320 11.1 12.1 999 9999.9  29.92 99.9 99.9 99.9
202518808501GSLM4   29  60.4 999.9 310 12.1 14.0 999 9999.9  29.93 99.9 99.9 99.9
202518809001GSLM4   29  60.4 999.9 330 12.1 14.0 999 9999.9  29.93 99.9 99.9 99.9
202518809101GSLM4   29  60.1 999.9 320 12.1 13.0 999 9999.9  29.93 99.9 99.9 99.9
202518809201GSLM4   29  60.1 999.9 320 11.1 13.0 999 9999.9  29.93 99.9 99.9 99.9
202518809301GSLM4   29  60.3 999.9 330 12.1 13.0 999 9999.9  29.93 99.9 99.9 99.9
202518809401GSLM4   29  60.3 999.9 330 13.0 15.9 999 9999.9  29.93 99.9 99.9 99.9
202518809501GSLM4   29  60.4 999.9 320 13.0 15.0 999 9999.9  29.94 99.9 99.9 99.9
202518810001GSLM4   29  60.3 999.9 320 14.0 16.9 999 9999.9  29.94 99.9 99.9 99.9
202518810101GSLM4   29  60.1 999.9 320 13.0 16.9 999 9999.9  29.95 99.9 99.9 99.9
202518810201GSLM4   29  59.9 999.9 320 15.0 16.9 999 9999.9  29.95 99.9 99.9 99.9
202518810301GSLM4   29  60.1 999.9 330 15.9 16.9 999 9999.9  29.95 99.9 99.9 99.9
202518810401GSLM4   29  59.5 999.9 320 11.1 16.9 999 9999.9  29.96 99.9 99.9 99.9
202518810501GSLM4   29  60.1 999.9 340 13.0 14.0 999 9999.9  29.96 99.9 99.9 99.9
202518811001GSLM4   29  60.1 999.9 320 12.1 14.0 999 9999.9  29.97 99.9 99.9 99.9
202518811101GSLM4   29  59.9 999.9 320 11.1 13.0 999 9999.9  29.97 99.9 99.9 99.9
202518811201GSLM4   29  60.3 999.9 330 11.1 14.0 999 9999.9  29.97 99.9 99.9 99.9
202518811301GSLM4   29  60.1 999.9 330 11.1 13.0 999 9999.9  29.98 99.9 99.9 99.9
202518811401GSLM4   29  60.1 999.9 320 11.1 15.9 999 9999.9  29.98 99.9 99.9 99.9
202518811501GSLM4   29  59.9 999.9 330 12.1 13.0 999 9999.9  29.98 99.9 99.9 99.9
202518812001GSLM4   29  59.9 999.9 330  9.9 13.0 999 9999.9  29.98 99.9 99.9 99.9
202518812101GSLM4   29  59.9 999.9 320  8.9 12.1 999 9999.9  29.99 99.9 99.9 99.9
202518812201GSLM4   29  60.1 999.9 330  8.9 11.1 999 9999.9  29.99 99.9 99.9 99.9
202518812301GSLM4   29  60.1 999.9 340  8.0 11.1 999 9999.9  29.99 99.9 99.9 99.9
202518812401GSLM4   29  60.1 999.9 340  8.0  9.9 999 9999.9  29.99 99.9 99.9 99.9
202518812501GSLM4   29  60.1 999.9 340  6.0  8.9 999 9999.9  30.00 99.9 99.9 99.9
202518813001GSLM4   29  60.1 999.9 330  8.0  8.9 999 9999.9  30.00 99.9 99.9 99.9
202518813101GSLM4   29  60.3 999.9 340  5.1  8.9 999 9999.9  30.00 99.9 99.9 99.9
202518813201GSLM4   29  60.4 999.9 340  6.0  8.9 999 9999.9  30.00 99.9 99.9 99.9
202518813301GSLM4   29  60.4 999.9 310  8.0  9.9 999 9999.9  30.01 99.9 99.9 99.9
202518813401GSLM4   29  60.4 999.9 310  8.9  9.9 999 9999.9  30.02 99.9 99.9 99.9
202518813501GSLM4   29  60.6 999.9 310  8.0  9.9 999 9999.9  30.01 99.9 99.9 99.9
202518814001GSLM4   29  60.6 999.9 300  9.9 11.1 999 9999.9  30.01 99.9 99.9 99.9
202518814101GSLM4   29  61.2 999.9 310  8.0 11.1 999 9999.9  30.01 99.9 99.9 99.9
202518814201GSLM4   29  61.2 999.9 310  8.9  9.9 999 9999.9  30.01 99.9 99.9 99.9
202518814301GSLM4   29  61.2 999.9 300  7.0  9.9 999 9999.9  30.01 99.9 99.9 99.9
202518814401GSLM4   29  61.3 999.9 300  7.0  8.9 999 9999.9  30.02 99.9 99.9 99.9
202518814501GSLM4   29  61.3 999.9 310  9.9 12.1 999 9999.9  30.01 99.9 99.9 99.9
202518815001GSLM4   29  61.5 999.9 310  8.0 12.1 999 9999.9  30.01 99.9 99.9 99.9
202518815101GSLM4   29  61.9 999.9 310  7.0  8.9 999 9999.9  30.01 99.9 99.9 99.9
202518815201GSLM4   29  61.7 999.9 310  8.9 11.1 999 9999.9  30.01 99.9 99.9 99.9
202518815301GSLM4   29  61.7 999.9 300  9.9 13.0 999 9999.9  30.02 99.9 99.9 99.9
202518815401GSLM4   29  61.9 999.9 300  8.9 12.1 999 9999.9  30.02 99.9 99.9 99.9
202518815501GSLM4   29  62.1 999.9 310  9.9 12.1 999 9999.9  30.02 99.9 99.9 99.9
202518816001GSLM4   29  61.9 999.9 320  8.0 13.0 999 9999.9  30.02 99.9 99.9 99.9
202518816101GSLM4   29  62.2 999.9 310  8.0  9.9 999 9999.9  30.02 99.9 99.9 99.9
202518816201GSLM4   29  62.6 999.9 300  8.0 11.1 999 9999.9  30.02 99.9 99.9 99.9
202518816301GSLM4   29  63.1 999.9 310  8.0  9.9 999 9999.9  30.02 99.9 99.9 99.9
202518816401GSLM4   29  63.3 999.9 330  8.0  9.9 999 9999.9  30.03 99.9 99.9 99.9
202518816501GSLM4   29  63.3 999.9 340  7.0  8.9 999 9999.9  30.02 99.9 99.9 99.9
202518817001GSLM4   29  63.3 999.9 330  5.1  7.0 999 9999.9  30.03 99.9 99.9 99.9
202518817101GSLM4   29  63.5 999.9 350  6.0  8.0 999 9999.9  30.02 99.9 99.9 99.9
202518817201GSLM4   29  63.9 999.9  10  7.0  9.9 999 9999.9  30.02 99.9 99.9 99.9
202518817301GSLM4   29  63.9 999.9 350  7.0  8.9 999 9999.9  30.02 99.9 99.9 99.9
202518817401GSLM4   29  63.9 999.9  10  7.0  8.0 999 9999.9  30.03 99.9 99.9 99.9
202518817501GSLM4   29  64.0 999.9 360  7.0  7.0 999 9999.9  30.03 99.9 99.9 99.9
202518818001GSLM4   29  64.0 999.9 350  5.1  7.0 999 9999.9  30.03 99.9 99.9 99.9
202518818101GSLM4   29  64.0 999.9  10  4.1  6.0 999 9999.9  30.03 99.9 99.9 99.9
202518818201GSLM4   29  64.2 999.9  10  6.0  7.0 999 9999.9  30.03 99.9 99.9 99.9
202518818301GSLM4   29  64.4 999.9 360  2.9  6.0 999 9999.9  30.03 99.9 99.9 99.9
202518818401GSLM4   29  64.4 999.9  10  4.1  5.1 999 9999.9  30.03 99.9 99.9 99.9
202518818501GSLM4   29  64.2 999.9  20  4.1  6.0 999 9999.9  30.03 99.9 99.9 99.9
202518819001GSLM4   29  64.4 999.9  10  4.1  5.1 999 9999.9  30.03 99.9 99.9 99.9
202518819101GSLM4   29  64.4 999.9  10  4.1  5.1 999 9999.9  30.03 99.9 99.9 99.9
202518819201GSLM4   29  64.6 999.9  10  4.1  5.1 999 9999.9  30.03 99.9 99.9 99.9
202518819301GSLM4   29  64.6 999.9  30  4.1  4.1 999 9999.9  30.03 99.9 99.9 99.9
202518819401GSLM4   29  64.8 999.9  10  2.9  4.1 999 9999.9  30.02 99.9 99.9 99.9
  New Graph (click on parameter):                                      
  at | dp | wd | ws | wg | cc | sr | bp | wt | wvh | wvp
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  [every 3rd data value plotted]
119 matching elements
0.033 sec
This Web page created and maintained by Greg Lang, NOAA/GLERL,
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