Tropical Depression 28W

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              
     20171102 081907   -8.6      N/A   N/A   55.55    8.63  40.0 SSMI15  12.6 -116.2   12.6 -116.2   12.9 -116.3 Analysis Plot     
     20171102 083100   -7.9      N/A  50.7%  66.66    7.89  40.0 SSMI16  12.6 -116.1   12.6 -116.1   12.5 -116.1 Analysis Plot     
     20171102 104200   -0.0      N/A   N/A     N/A    0.00  40.0 SSMI18  12.6 -115.6   12.6 -115.6   12.9 -115.1 Analysis Plot     
     20171102 105300   -2.3      N/A  64.4%  22.22    2.28  40.0 SSMI17  12.6 -115.5   12.6 -115.5   13.0 -115.2 Analysis Plot     
     20171102 195327   40.7  >65 kts 100.0%  44.44   25.74  55.0 SSMI15  12.6 -114.0   12.6 -114.0   12.6 -114.3 Analysis Plot     
     20171102 215900   12.2      N/A  64.4%  77.77   12.15  55.0 SSMI16  12.6 -113.9   12.8 -114.1   12.8 -114.1 Analysis Plot     
     20171102 232900   35.3  >65 kts 100.0%  44.44   20.33  55.0 SSMI17  12.5 -113.4   12.7 -113.6   12.7 -113.6 Analysis Plot     
     20171103 011817    7.8      N/A  34.2%  44.44    7.76  55.0    GMI  12.5 -113.1   12.8 -113.3   12.8 -113.3 Analysis Plot     
     20171103 081700   32.4  >65 kts  98.6%  55.55   17.39  75.0 SSMI16  12.7 -112.7   12.7 -112.5   12.7 -112.5 Analysis Plot     
     20171103 103000   31.6  >65 kts  89.0%  33.33   16.62  75.0 SSMI18  12.7 -112.2   12.7 -111.9   12.7 -111.9 Analysis Plot     
     20171103 103900   38.3  >65 kts 100.0%  22.22   23.34  75.0 SSMI17  12.7 -112.1   12.7 -111.9   12.7 -111.9 Analysis Plot     
     20171103 200834 -930.0      N/A   N/A     N/A    0.00  85.0 SSMI15  12.8 -110.1   12.8 -110.1   12.1 -110.9 Analysis Plot     
     20171103 230700   77.0  >85 kts 100.0%  33.33   62.01  90.0 SSMI18  12.9 -109.2   12.6 -109.3   12.6 -109.3 Analysis Plot     
     20171103 231600   66.4  >85 kts 100.0%  22.22   51.41  90.0 SSMI17  12.9 -109.2   12.6 -109.3   12.6 -109.3 Analysis Plot     
     20171104 054600   -0.0      N/A   N/A     N/A    0.00  75.0  AMSR2  12.6 -108.0   12.4 -107.6   12.4 -107.6 Analysis Plot     
     20171104 095801 -930.0      N/A   N/A     N/A    0.00  75.0 SSMI15  12.6 -107.5   12.6 -106.7   12.6 -106.7 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.