Tropical Depression 13L

Passive Microwave (PMW) Intensity Information
Advanced Dvorak Technique (ADT)
Version 8.2.1


         Overpass     Inten           Ring    Ring          Wind           Forecast        Final        Target  
       Date    Time   Score  Meaning   Pct    Diam  BTdiff   Est   Sat    Lat    Lon    Lat    Lon    Lat    Lon              
     20170905 201425 -930.0      N/A   N/A     N/A    0.00  30.0  AMSR2  22.4   96.7   22.4   96.7   22.6   97.1 Analysis Plot     
     20170906 003600   -8.9      N/A  42.5%  55.55    8.92  30.0 SSMI18  22.4   96.6   22.4   96.6   22.1   96.4 Analysis Plot     
     20170906 003600   -8.8      N/A  41.1%  66.66    8.75  30.0 SSMI18  22.2   96.5   22.2   96.5   22.1   96.3 Analysis Plot     
     20170906 093007   -4.2      N/A  60.3%  44.44    4.17  35.0 SSMI15  22.1   96.3   22.1   96.3   21.8   96.1 Analysis Plot     
     20170906 130700   -0.0      N/A   N/A     N/A    0.00  40.0 SSMI18  21.8   96.0   21.8   96.0   21.6   95.6 Analysis Plot     
     20170906 190458 -930.0      N/A   N/A     N/A    0.00  40.0    GMI  21.6   95.7   21.6   95.7   22.0   95.8 Analysis Plot     
     20170906 191812   -0.0      N/A   N/A     N/A    0.00  65.0  AMSR2  21.8   95.2   21.8   95.2   21.8   95.2 Analysis Plot     
     20170906 223600   -0.0      N/A   N/A     N/A    0.00  65.0 SSMI16  21.7   95.1   21.7   95.1   22.6   95.4 Analysis Plot     
     20170907 002300   16.8      N/A  98.6%  11.11    1.76  65.0 SSMI18  21.6   95.0   21.6   95.0   21.8   94.9 Analysis Plot     
     20170907 002400 -930.0      N/A   N/A     N/A    0.00  70.0 SSMI18  21.7   94.9   21.7   94.9   22.1   93.9 Analysis Plot     
     20170907 091536 -930.0      N/A   N/A     N/A    0.00  70.0 SSMI15  21.5   94.5   20.7   94.7   20.7   94.7 Analysis Plot     
     20170907 125500   32.8  >65 kts  93.2%  22.22   17.75  70.0 SSMI18  21.6   94.6   21.7   94.5   21.7   94.5 Analysis Plot     
     20170907 181331   18.9      N/A  90.4%  11.11    3.93  70.0    GMI  21.5   94.7   21.5   94.6   21.5   94.6 Analysis Plot     
     20170907 200118   10.2      N/A  74.0%  11.11   10.25  70.0  AMSR2  21.6   94.6   21.6   94.7   21.6   94.7 Analysis Plot     
     20170908 001100   44.3  >65 kts 100.0%  44.44   29.35  70.0 SSMI18  21.5   94.7   21.5   94.7   21.5   94.9 Analysis Plot     
     20170908 001100   45.0  >65 kts 100.0%  44.44   29.96  75.0 SSMI18  21.6   95.0   21.6   95.0   21.5   94.9 Analysis Plot     
     20170908 073251   41.4  >65 kts 100.0%  33.33   26.41  80.0    GMI  21.4   95.3   21.3   95.4   21.3   95.4 Analysis Plot     
     20170908 122000   54.7  >65 kts 100.0%  33.33   39.66  80.0 SSMI16  21.3   95.5   21.1   95.6   21.1   95.6 Analysis Plot     
     20170908 124300   41.3  >65 kts 100.0%  22.22   26.32  80.0 SSMI18  21.1   95.7   21.2   95.6   21.2   95.6 Analysis Plot     
     20170908 134200 -930.0      N/A   N/A     N/A    0.00  80.0 SSMI17  21.0   95.8   21.0   95.8   21.2   96.2 Analysis Plot     
     20170909 005500 -930.0      N/A   N/A     N/A    0.00  70.0 SSMI17  20.8   96.9   20.8   96.9   20.5   98.0 Analysis Plot     
     20170909 005500   -0.0      N/A   N/A     N/A    0.00  70.0 SSMI17  20.7   97.1   20.7   97.1   20.2   97.3 Analysis Plot     
     20170909 120700   -1.7      N/A   N/A  111.10    1.69  35.0 SSMI16  20.3   97.5   20.3   97.5   19.6   97.8 Analysis Plot     
     20170909 123300 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI18  20.1   97.8   20.1   97.8   18.7   98.2 Analysis Plot

Legend:

  - Date/Time are determined from PMW imagery at Forecast (initial guess) Lat/Lon position.

  - Positive/Negative Latitude = North/South Hemisphere; Longitude = Western/Eastern Hemisphere.

  - "Ring Diam" value indicates the estimated surface eyewall diameter in km (the MI eyewall edge diameter minus 10 km).

  - "Ring Pct" is the percentage of the "ring" (eyewall inner boundary) that is 1) colder than the "hot spot" (warmest eye pixel) in the eye by 20K, or 2) the percentage that is a) colder than 232K and b) colder than the "hot spot" by 10K, whichever is greater.
  - Values are red if Ring % <= 65, yellow/brown if Ring % <= 85 and green if Ring % > 85.

  - "Tb diff" is the difference between the "hot spot" (warmest eye pixel) and the warmest pixel on the eyewall.

  - Intensity score are listed as negative, and not used, when the JTWC or NHC estimated Vmax is <55 kts in order to rule out weak but highly symmetric TCs.

  - Error messages in intensity scores: -920 is used when the hottest pixel in the eye is <200K, to prevent false positives; -930 means <85% of eyewall has observations/data.