Tropical Depression 21N_04


ARCHER-V2 Auto-positioning Information
Advanced Dvorak Technique (ADT)
Version 9.0
 

                                         -------FORECAST-----   ----ARCHER---- 50% cert  95% cert Eyewall   Conf Alpha  Eye
     Date/Time(UTC)     Source   Sensor    Lat     Lon   Vmax      Lat     Lon   radius    radius  radius  Score Score  Prob    .
   20201122 03:45:00  METEOSAT   NearIR   11.15  -54.00  30.0    10.45  -52.93     2.61      7.39   0.15    0.12  0.64  12.3 GIF
   20201122 04:15:00  METEOSAT       IR   11.12  -53.88  30.0    10.45  -52.86     0.00      0.00    N/A    0.00  0.00   0.0 GIF
   20201122 04:45:00  METEOSAT       IR   11.09  -53.76  30.0    10.49  -52.74     0.00      0.00    N/A    0.00  0.00   0.0 GIF
   20201122 05:15:00  METEOSAT   NearIR   11.06  -53.64  30.0    10.43  -52.60     0.66      1.88   0.15    0.33  2.53  51.0 GIF
   20201122 05:45:00  METEOSAT   NearIR   11.02  -53.53  30.0    10.39  -52.54     0.63      1.78   0.15    0.35  2.67  60.8 GIF
   20201122 06:15:00  METEOSAT   NearIR   10.98  -53.43  30.0    10.40  -52.46     3.36      9.49   0.15    0.01  0.50   0.9 GIF
   20201122 06:45:00  METEOSAT   NearIR   10.94  -53.32  30.0     9.79  -54.26     0.94      2.66   0.35    0.25  1.78  53.2 GIF
   20201122 07:15:00  METEOSAT       IR   10.89  -53.21  30.0    10.37  -52.25     3.02      8.54   0.10    0.27  0.56  77.1 GIF
   20201122 07:45:00  METEOSAT   NearIR   10.85  -53.11  30.0    10.38  -52.17     0.98      2.78   0.15    0.24  1.71  49.6 GIF
   20201122 08:15:00  METEOSAT       IR   10.81  -53.00  30.0    10.41  -52.06     0.53      1.51   0.15    0.53  3.15 100.0 GIF
   20201122 08:45:00  METEOSAT       IR   10.25  -52.16  40.0    10.42  -51.96     0.18      0.50   0.15    1.18  9.57 100.0 GIF
   20201122 09:15:00  METEOSAT   NearIR   10.23  -52.08  40.0    10.38  -51.90     0.17      0.48   0.20    1.19  9.97  95.9 GIF
   20201122 09:45:00  METEOSAT       IR   10.22  -51.99  40.0    10.40  -51.84     0.12      0.35   0.10    1.57 13.50 100.0 GIF
   20201122 10:15:00     AMSR2 85-92GHz   10.23  -52.00  40.0   -79.64  178.73     0.22      0.62    N/A    1.55  7.58   0.0 GIF
   20201122 09:40:52     AMSR2 85-92GHz   10.23  -52.00  40.0     6.28    1.23     0.22      0.62    N/A    1.55  0.00   0.0 GIF
   20201122 09:40:52     AMSR2 85-92GHz   10.23  -52.00  40.0     6.28    1.23     0.22      0.62    N/A    1.55  0.00   0.0 GIF
 
 
Key:

  - Date/Time: UTC time. If this observation is used in the track it is marked with a "*". If it is used for its own 30-minute window, it is put in bold.

  - Source/sensor: Satellite source of the analyzed image.

  - Vmax: Maximum winds listed in the forecast center analysis/forecast, *not* ARCHER.

  - ARCHER lat/lon: Coordinates of the ARCHER algorithm, valid at the time of the observation. If no center fix could be found, then it is "***".

  - Geo ref lat/lon: Coordinates of the ARCHER algorithm, valid at the time of the *nearest geo image*.

  - 50% cert. rad.: Radius of the circle (in degrees) that defines the area in which the ARCHER center of rotation is 50% certain. The lower the number, the more certain the position.

  - 95% cert. rad.: Radius of the circle (in degrees) that defines the area in which the ARCHER center of rotation is 95% certain.

  - Eye diam (deg): ARCHER-resolved eye diameter (in degrees). Green: robust, yellow: less certain, red: not robust.

  - % cert. of eye: Percent certainty that an eye exists in this image, determined by ARCHER. Currently only available for IR and 85-92 GHz imagery.

 
Links to related versions:
  - Track Plot
  - Summary table
  - Intensity Estimation