Tropical Depression 31W

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              
     20171117 194809   -1.2      N/A   N/A   33.33    1.21  35.0 SSMI15  10.9 -116.3   10.9 -116.3   10.7 -116.6 Analysis Plot     
     20171118 073706 -930.0      N/A   N/A     N/A    0.00  35.0    GMI  11.7 -113.1   11.7 -113.1   11.4 -113.6 Analysis Plot     
     20171118 093449 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI15  11.6 -113.2   11.6 -113.2   12.1 -113.1 Analysis Plot     
     20171118 104500 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI18  11.7 -112.6   11.7 -112.6   12.5 -113.1 Analysis Plot     
     20171118 205150   -0.0      N/A   N/A     N/A    0.00  35.0    GMI  10.7 -111.2   10.7 -111.2   10.3 -111.1 Analysis Plot     
     20171118 231900   -1.2      N/A  12.3% 155.54    1.21  35.0 SSMI17  10.7 -110.7   10.7 -110.7   11.1 -110.7 Analysis Plot     
     20171118 232300   -1.9      N/A  15.1% 122.21    1.91  35.0 SSMI18  10.7 -110.7   10.7 -110.7   11.1 -110.6 Analysis Plot     
     20171119 103300   -0.8      N/A   8.2% 133.32     .84  30.0 SSMI18  11.6 -108.1   11.6 -108.1   12.0 -107.4 Analysis Plot     
     20171119 205439   -0.0      N/A   N/A     N/A    0.00  30.0 SSMI15  11.8 -105.7   11.8 -105.7   11.6 -105.7 Analysis Plot     
     20171119 213800   -0.9      N/A   N/A   11.11     .92  30.0 SSMI16  11.8 -105.8   11.8 -105.8   12.0 -105.7 Analysis Plot     
     20171119 231000   -0.0      N/A   N/A     N/A    0.00  30.0 SSMI18  11.8 -105.0   11.8 -105.0   12.0 -104.6 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.