Tropical Depression 17S

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              
     20170427 074942   -0.0      N/A   N/A     N/A    0.00  35.0 SSMI15  -9.8 -129.6   -9.8 -129.6  -10.3 -128.9 Analysis Plot     
     20170427 193907   -4.2      N/A  39.7%  22.22    4.24  45.0    GMI -11.3 -127.3  -11.2 -127.1  -11.2 -127.1 Analysis Plot     
     20170427 214400  -15.6      N/A  45.2% 111.10   15.56  45.0 SSMI17 -11.4 -127.0  -11.5 -126.7  -11.5 -126.7 Analysis Plot     
     20170427 221400  -13.0      N/A  41.1%  55.55   13.02  45.0 SSMI18 -11.4 -126.9  -11.3 -126.6  -11.3 -126.6 Analysis Plot     
     20170428 073402    7.4      N/A  27.4%  44.44    7.38  55.0 SSMI15 -11.8 -125.5  -11.8 -125.5  -11.8 -125.5 Analysis Plot     
     20170428 102100   13.1      N/A  68.5%  22.22   13.07  55.0 SSMI17 -12.1 -125.0  -12.1 -125.0  -12.2 -125.3 Analysis Plot     
     20170428 105300 -930.0      N/A   N/A     N/A    0.00  55.0 SSMI18 -12.1 -124.9  -12.1 -124.9  -12.2 -125.1 Analysis Plot     
     20170428 213200   -0.0      N/A   N/A     N/A    0.00  70.0 SSMI17 -12.4 -124.1  -12.8 -124.3  -12.8 -124.3 Analysis Plot     
     20170428 220200    2.5      N/A  58.9% 111.10    2.46  70.0 SSMI18 -12.5 -124.1  -12.5 -124.1  -12.9 -124.5 Analysis Plot     
     20170429 061527 -930.0      N/A   N/A     N/A    0.00  70.0    GMI -13.2 -123.4  -13.2 -123.4  -14.3 -123.7 Analysis Plot     
     20170429 100800    6.6      N/A   5.5%  99.99    6.60  70.0 SSMI17 -13.4 -123.2  -13.4 -123.2  -13.5 -123.4 Analysis Plot     
     20170429 103900   -0.0      N/A   N/A     N/A    0.00  70.0 SSMI18 -13.4 -123.2  -13.4 -123.2  -14.0 -124.1 Analysis Plot     
     20170429 193011   -0.0      N/A   N/A     N/A    0.00  60.0    GMI -13.9 -122.4  -13.9 -122.4  -13.3 -122.4 Analysis Plot     
     20170429 204645    1.9      N/A   N/A   77.77    1.91  60.0 SSMI15 -13.8 -122.5  -13.8 -122.5  -13.4 -122.3 Analysis Plot     
     20170429 215000   -0.0      N/A   N/A     N/A    0.00  60.0 SSMI18 -13.9 -122.3  -13.9 -122.3  -13.6 -122.3 Analysis Plot     
     20170430 095600 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI17 -13.6 -121.8  -13.6 -121.8  -13.2 -122.1 Analysis Plot     
     20170430 102600   -4.0      N/A   2.7% 177.76    4.00  35.0 SSMI18 -13.6 -121.8  -13.6 -121.8  -13.8 -122.0 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.