Tropical Depression 08W

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              
     20170721 051121 -930.0      N/A   N/A     N/A    0.00  30.0  AMSR2  17.4 -114.3   17.4 -114.3   17.4 -114.8 Analysis Plot     
     20170721 075151   -3.3      N/A   5.5% 122.21    3.26  30.0    GMI  17.9 -113.5   17.9 -113.5   17.6 -114.3 Analysis Plot     
     20170721 102500   -4.2      N/A   6.8%  88.88    4.18  30.0 SSMI18  17.9 -113.3   17.9 -113.3   17.6 -113.8 Analysis Plot     
     20170722 091629   -0.0      N/A   N/A     N/A    0.00  30.0 SSMI15  17.8 -112.0   17.8 -112.0   17.7 -111.9 Analysis Plot     
     20170722 101400 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI18  18.0 -111.8   18.0 -111.8   17.5 -112.2 Analysis Plot     
     20170722 182453   -3.0      N/A  15.1%  22.22    3.03  30.0    GMI  17.7 -111.5   17.7 -111.5   17.6 -111.8 Analysis Plot     
     20170722 203645   -4.4      N/A  17.8% 144.43    4.38  30.0 SSMI15  17.9 -111.1   17.9 -111.1   18.1 -111.7 Analysis Plot     
     20170722 224800  -18.0      N/A 100.0%  33.33    3.03  30.0 SSMI18  17.9 -111.0   17.9 -111.0   17.5 -110.4 Analysis Plot     
     20170723 074227   -6.8      N/A   9.6% 111.10    6.82  35.0    GMI  17.6 -111.2   17.6 -111.2   17.6 -111.4 Analysis Plot     
     20170723 202958   -7.1      N/A   N/A  233.31    7.07  35.0 SSMI15  16.9 -111.5   16.9 -111.5   17.2 -111.4 Analysis Plot     
     20170724 084000   -2.5      N/A  31.5%  77.77    2.45  40.0 SSMI16  17.0 -110.8   17.0 -110.8   16.7 -110.4 Analysis Plot     
     20170724 181542   -9.1      N/A   2.7%  88.88    9.05  40.0    GMI  17.0 -109.8   17.0 -109.8   17.3 -109.8 Analysis Plot     
     20170724 194640   -3.6      N/A  17.8%  55.55    3.61  45.0 SSMI15  16.7 -109.6   16.7 -109.6   17.0 -109.3 Analysis Plot     
     20170724 220700   -0.0      N/A   N/A     N/A    0.00  45.0 SSMI16  16.7 -109.5   16.7 -109.5   17.2 -108.9 Analysis Plot     
     20170725 000000 -930.0      N/A   N/A     N/A    0.00  45.0 SSMI17  16.7 -108.6   16.7 -108.6   17.5 -108.4 Analysis Plot     
     20170725 111600 -930.0      N/A   N/A     N/A    0.00  40.0 SSMI18  17.0 -106.4   17.0 -106.4   16.8 -106.0 Analysis Plot     
     20170725 183548   -0.0      N/A   N/A     N/A    0.00  40.0  AMSR2  17.1 -105.0   17.1 -105.0   17.1 -105.0 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.