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Hurricane Symbol Storm Special! View the latest observations near Atlantic Potential Tropical Cyclone Four.

NDBC added additional data to its .drift file format on August 17. For more info, see the Drift File Format Change Notice.

Observations - Radial Search

Distance is entered as nautical miles or kilometers depending on whether you choose Imperial or Metric.

(e.g. 30.5N   or   30 30 0 N   or   30 30 N)

(e.g. 90W   or   90 0 0 W   or   90 0 W)

  

       


Not All Stations Depicted are Operated by the National Data Buoy Center.

97 observations from 08/20/2022 0400 GMT to 08/20/2022 0517 GMT

ID      T1 TIME    LAT     LON DIST HDG WDIR  WSPD   GST  WVHT   DPD   APD MWD   PRES  PTDY  ATMP  WTMP  DEWP   VIS  TCC  TIDE  S1HT  S1PD  S1DIR  S2HT  S2PD  S2DIR   Ice   Sea      SwH      SwP     SwD     WWH    WWP    WWD      STEEPNESS
           (GMT)                 nm  °T   °T   kts   kts    ft   sec   sec  °T     in    in    °F    °F    °F   nmi  8th    ft    ft   sec     °T    ft   sec     °T   Acc   Ice       ft      sec              ft    sec     
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
HHLO1    O 0500  41.40  -82.55    4 278  180   5.1   6.0     -     -     -   -  30.00 +0.01  72.1     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45005    B 0500  41.68  -82.40   18   9  120   9.7  11.7     -     -     -   -  30.01 +0.01  76.5     -  69.3     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45201    B 0500  41.60  -82.78   19 311   70  11.7  13.6   1.0     3     -  69      -     -  75.9  76.5  68.9     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
SBIO1    C 0500  41.63  -82.84   22 310  130    14    15     -     -     -   -  30.03 +0.01  75.7     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45202    B 0500  41.53  -82.94   23 291  150   9.7  11.7   0.3     -     - 109      -     -  75.4  77.0  66.9     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45176    B 0500  41.55  -81.77   32  73  150   3.9   5.8   0.7     -     -  25  30.05 +0.02  75.4  76.3     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45164    B 0500  41.75  -81.70   40  57    -   7.8   9.7   0.7     -     -   -      -     -  75.4  75.9     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45165    B 0500  41.70  -83.26   40 298  110   7.8   9.7   1.3     3     -  78      -     -  75.2  75.9     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
SHIP     S 0500  41.90  -83.10   42 317  160  13.0     -     -     -     -   -  30.03 +0.01  76.6  76.3  69.4     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
SHIP     S 0500  41.70  -81.60   43  64  120   8.0     -     -     -     -   -  30.04     -  75.7  76.5  65.3     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
    10 observations reported for 0500 GMT

ID      T1 TIME    LAT     LON DIST HDG WDIR  WSPD   GST  WVHT   DPD   APD MWD   PRES  PTDY  ATMP  WTMP  DEWP   VIS  TCC  TIDE  S1HT  S1PD  S1DIR  S2HT  S2PD  S2DIR   Ice   Sea      SwH      SwP     SwD     WWH    WWP    WWD      STEEPNESS
           (GMT)                 nm  °T   °T   kts   kts    ft   sec   sec  °T     in    in    °F    °F    °F   nmi  8th    ft    ft   sec     °T    ft   sec     °T   Acc   Ice       ft      sec              ft    sec     
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
HHLO1    O 0450  41.40  -82.55    4 278  170   4.1   5.1     -     -     -   -  30.00     -  72.0     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
HHLO1    O 0440  41.40  -82.55    4 278  170   4.1   6.0     -     -     -   -  30.00     -  72.1     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
HHLO1    O 0430  41.40  -82.55    4 278  170   4.1   5.1     -     -     -   -  30.00     -  72.0     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
HHLO1    O 0420  41.40  -82.55    4 278  160   1.9   2.9     -     -     -   -  30.00     -  72.3     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
HHLO1    O 0410  41.40  -82.55    4 278  160   1.9   5.1     -     -     -   -  30.00     -  73.0     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
HHLO1    O 0400  41.40  -82.55    4 278  140   5.1   7.0     -     -     -   -  30.00 +0.03  72.9     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
LORO1    O 0430  41.48  -82.20   13  65  140     6     8     -     -     -   -      -     -  73.9     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
LORO1    O 0420  41.48  -82.20   13  65  140     7     8     -     -     -   -      -     -  74.1     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
LORO1    O 0410  41.48  -82.20   13  65  130     6     8     -     -     -   -      -     -  74.1     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
LORO1    O 0400  41.48  -82.20   13  65  130     7     8     -     -     -   -      -     -  74.1     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
MRHO1    O 0448  41.54  -82.73   15 307  120   2.9   6.0     -     -     -   -  30.02     -  74.3  75.4  62.4     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
MRHO1    O 0442  41.54  -82.73   15 307  120   1.9   6.0     -     -     -   -  30.02     -  74.3  75.4  62.6     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
MRHO1    O 0436  41.54  -82.73   15 307  120   2.9   6.0     -     -     -   -  30.02     -  74.3  75.4  62.2     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
MRHO1    O 0430  41.54  -82.73   15 307  120   4.1   7.0     -     -     -   -  30.01     -  74.7  75.4  62.2     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
MRHO1    O 0424  41.54  -82.73   15 307  120   2.9   7.0     -     -     -   -  30.01     -  74.8  75.4  62.4     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
MRHO1    O 0418  41.54  -82.73   15 307  120   4.1   6.0     -     -     -   -  30.01     -  75.0  75.4  62.8     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
MRHO1    O 0412  41.54  -82.73   15 307  120   2.9   6.0     -     -     -   -  30.01     -  75.0  75.6  62.6     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
MRHO1    O 0406  41.54  -82.73   15 307  120   2.9   7.0     -     -     -   -  30.01     -  75.0  75.4  62.4     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
MRHO1    O 0400  41.54  -82.73   15 307  120   1.9   6.0     -     -     -   -  30.01 +0.03  75.0  75.6  62.1     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45005    B 0450  41.68  -82.40   18   9  120   9.7  11.7   1.3     7   3.2  92  30.01     -  76.5  76.1  69.3     -    -     -     -     -      -     -     -      -  ---- -----     0.66     7.1       E    0.98    2.6    ESE            N/A
45005    B 0440  41.68  -82.40   18   9  120   9.7  11.7     -     -     -   -  30.01     -  76.5  76.1  69.3     -    -     -     -     -      -     -     -      -  ---- -----     0.66     7.1       E    0.98    2.6    ESE            N/A
45005    B 0430  41.68  -82.40   18   9  120   9.7  11.7     -     -     -   -  30.01     -  76.3  75.9  69.4     -    -     -     -     -      -     -     -      -  ---- -----     0.66     7.1       E    0.98    2.6    ESE            N/A
45005    B 0420  41.68  -82.40   18   9  120   9.7  11.7     -     -     -   -  30.01     -  76.5  75.9  69.1     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45005    B 0410  41.68  -82.40   18   9  110   9.7  11.7     -     -     -   -  30.01     -  76.3  75.9  68.5     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45005    B 0400  41.68  -82.40   18   9  110   9.7   9.7     -     -     -   -  30.01     -  76.1  76.1  70.0     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45201    B 0440  41.60  -82.78   19 311   80  11.7  13.6   1.0     3     -  81      -     -  76.3  76.6  69.3     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45201    B 0430  41.60  -82.78   19 311   70  11.7  13.6   1.0     2     -  81      -     -  76.5  76.6  69.4     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45201    B 0420  41.60  -82.78   19 311   70  11.7  15.5   1.0     3     -  79      -     -  76.5  76.6  69.4     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45201    B 0410  41.60  -82.78   19 311   70  11.7  13.6   1.0     3     -  87      -     -  76.5  76.6  69.6     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
SBIO1    C 0400  41.63  -82.84   22 310  120    13    14     -     -     -   -  30.03 +0.02  76.1     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45202    B 0440  41.53  -82.94   23 291  150   9.7  11.7   0.3     -     - 103      -     -  75.7  76.8  67.5     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45202    B 0430  41.53  -82.94   23 291  140   7.8   9.7   0.3     -     - 105      -     -  75.9  76.8  67.6     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45202    B 0420  41.53  -82.94   23 291  140   9.7  11.7   0.3     -     -  92      -     -  75.9  77.0  68.4     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45202    B 0410  41.53  -82.94   23 291  140   7.8   9.7   0.3     -     - 141      -     -  75.9  77.0  69.4     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45196    B 0450  41.52  -81.88   27  73   90   3.9   7.8   0.7     -     -  46  30.03     -  75.2  76.1  65.7     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45196    B 0440  41.52  -81.88   27  73  120   3.9   5.8   0.7     -     -  48  30.03     -  75.4  76.3  65.3     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45196    B 0430  41.52  -81.88   27  73  120   3.9   5.8   0.7     -     -  48  30.02     -  75.6  76.3  65.5     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45196    B 0420  41.52  -81.88   27  73  140   3.9   3.9   0.7     -     -  48  30.02     -  75.6  76.3  65.8     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45196    B 0410  41.52  -81.88   27  73  130   3.9   5.8   0.7     -     -  48  30.02     -  75.7  76.3  66.6     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45196    B 0400  41.52  -81.88   27  73  150   3.9   3.9   0.7     -     -  48  30.02 +0.03  75.7  76.3  67.1     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45176    B 0450  41.55  -81.77   32  73  160   5.8   5.8   0.7     -     -  28  30.06     -  75.6  76.5     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45176    B 0440  41.55  -81.77   32  73  160   5.8   5.8   0.7     -     -  22  30.06     -  75.9  76.5     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45176    B 0430  41.55  -81.77   32  73  150   5.8   5.8   0.7     -     -  28  30.06     -  76.3  76.3     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45176    B 0420  41.55  -81.77   32  73  120   3.9   5.8   0.7     -     -  38  30.06     -  76.1  76.3     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45176    B 0410  41.55  -81.77   32  73  110   3.9   5.8   0.7     -     -  25  30.05     -  76.3  76.5     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
SHIP     S 0400  41.60  -81.80   32  67  110   7.0     -     -     -     -   -  30.02     -  76.6  76.8  65.7     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
CNDO1    O 0448  41.54  -81.64   38  76    -   0.0   1.0     -     -     -   -  30.07     -  68.0  75.9  61.3     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
CNDO1    O 0442  41.54  -81.64   38  76    -   0.0   1.9     -     -     -   -  30.07     -  68.5  75.9  61.5     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
CNDO1    O 0436  41.54  -81.64   38  76    -   0.0   1.0     -     -     -   -  30.07     -  68.5  75.9  61.5     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
CNDO1    O 0430  41.54  -81.64   38  76    -   0.0   1.0     -     -     -   -  30.07     -  68.9  75.9  61.5     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
CNDO1    O 0424  41.54  -81.64   38  76    -   0.0   1.0     -     -     -   -  30.06     -  68.5  75.9  61.3     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
CNDO1    O 0418  41.54  -81.64   38  76    -   0.0   1.0     -     -     -   -  30.06     -  68.9  75.9  61.5     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
CNDO1    O 0412  41.54  -81.64   38  76    -   0.0   1.9     -     -     -   -  30.06     -  68.7  75.9  61.3     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
CNDO1    O 0406  41.54  -81.64   38  76    -   0.0   1.0     -     -     -   -  30.06     -  68.7  75.9  61.3     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
CNDO1    O 0400  41.54  -81.64   38  76    -   0.0   1.9     -     -     -   -  30.06 +0.03  68.7  75.9  61.3     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45165    B 0450  41.70  -83.26   40 298  110   7.8   9.7   1.0     3     -  79      -     -  75.2  75.9     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45197    B 0450  41.62  -81.62   40  70  120   5.8   7.8   0.7     -     -  56  30.06     -  74.5  75.9  65.8     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
TWCO1    O 0450  41.70  -83.26   40 298  130    10    11     -     -     -   -      -     -  74.7  75.7  69.8     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45165    B 0440  41.70  -83.26   40 298  110   7.8   9.7   1.3     3     -  77      -     -  75.0  75.9     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45197    B 0440  41.62  -81.62   40  70  120   5.8   7.8   0.7     -     -  56  30.06     -  74.5  75.9  66.0     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
TWCO1    O 0440  41.70  -83.26   40 298  130    10    11     -     -     -   -      -     -  74.5  75.7  69.6     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45165    B 0430  41.70  -83.26   40 298  110   7.8   9.7   1.0     3     -  75      -     -  75.0  75.9     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45197    B 0430  41.62  -81.62   40  70  120   7.8   9.7   0.7     -     -  57  30.06     -  74.8  75.9  65.7     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
TWCO1    O 0430  41.70  -83.26   40 298  130    10    11     -     -     -   -      -     -  74.5  75.7  69.8     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45165    B 0420  41.70  -83.26   40 298  110   7.8   9.7   1.0     3     -  76      -     -  75.2  75.9     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45197    B 0420  41.62  -81.62   40  70  120   5.8   7.8   0.7     -     -  59  30.05     -  75.2  75.9  66.2     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
TWCO1    O 0420  41.70  -83.26   40 298  130    10    11     -     -     -   -      -     -  74.7  75.7  69.8     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45165    B 0410  41.70  -83.26   40 298  110   7.8   9.7   1.0     3     -  65      -     -  75.6  75.9     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
45197    B 0410  41.62  -81.62   40  70  120   5.8   7.8   0.7     -     -  62  30.05     -  75.4  75.9  66.2     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
TWCO1    O 0410  41.70  -83.26   40 298  130    10    12     -     -     -   -      -     -  74.8  75.7  70.0     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45164    B 0400  41.75  -81.70   40  57    -   7.8   9.7   0.7     -     -   -      -     -  75.9  76.1     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
45197    B 0400  41.62  -81.62   40  70  120   5.8   7.8   0.7     -     -  63  30.05 +0.02  75.6  75.9  65.8     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -            N/A
THLO1    O 0440  41.83  -83.19   42 309  120    14    15     -     -     -   -      -     -  76.6     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
THLO1    O 0430  41.83  -83.19   42 309  130    13    15     -     -     -   -      -     -  76.5     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
THLO1    O 0420  41.83  -83.19   42 309  130    13    14     -     -     -   -      -     -  76.5     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
THLO1    O 0410  41.83  -83.19   42 309  120    14    15     -     -     -   -      -     -  76.3     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
THLO1    O 0400  41.83  -83.19   42 309  120    13    14     -     -     -   -      -     -  76.5     -     -     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
SHIP     S 0400  41.90  -83.20   45 313  140   9.9     -     -     -     -   -  30.03 +0.03  76.1  76.8  70.7     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
THRO1    O 0448  41.69  -83.47   49 292  130   4.1   5.1     -     -     -   -  30.01     -  73.0     -  65.5     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
THRO1    O 0442  41.69  -83.47   49 292  140   4.1   5.1     -     -     -   -  30.01     -  73.0     -  64.9     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
THRO1    O 0436  41.69  -83.47   49 292  130   4.1   5.1     -     -     -   -  30.01     -  73.0     -  65.1     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
THRO1    O 0430  41.69  -83.47   49 292  130   4.1   7.0     -     -     -   -  30.01     -  73.2     -  65.5     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
THRO1    O 0424  41.69  -83.47   49 292  140   6.0   8.0     -     -     -   -  30.01     -  73.4     -  64.9     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
THRO1    O 0418  41.69  -83.47   49 292  140   6.0   8.0     -     -     -   -  30.01     -  73.4     -  64.9     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
THRO1    O 0412  41.69  -83.47   49 292  140   7.0   8.9     -     -     -   -  30.01     -  73.4     -  64.9     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
THRO1    O 0406  41.69  -83.47   49 292  140   6.0   7.0     -     -     -   -  30.01     -  73.4     -  65.1     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
THRO1    O 0400  41.69  -83.47   49 292  140   6.0   7.0     -     -     -   -  30.01 +0.03  73.4     -  65.5     -    -     -     -     -      -     -     -      -  ---- -----        -       -       -       -      -      -              -
    87 observations reported for 0400 GMT

1 B = Buoy, C = C-MAN Station, D = Drifting Buoy, S = Ship, O = Other

Description of Observation Data