Tropical Storm 15W

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              
     20170820 075123   -2.6      N/A   1.4% 188.87    2.63  30.0 SSMI15  20.0 -125.8   20.0 -125.8   20.7 -126.7 Analysis Plot     
     20170820 090011   -4.4      N/A  12.3%  66.66    4.45  30.0    GMI  20.5 -128.0   20.5 -128.0   21.1 -127.2 Analysis Plot     
     20170820 091600   -1.4      N/A  23.3%  55.55    1.39  30.0 SSMI18  20.5 -127.8   20.5 -127.8   21.1 -127.1 Analysis Plot     
     20170820 193601 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI15  19.9 -124.4   19.9 -124.4   20.6 -125.3 Analysis Plot     
     20170820 221804 -930.0      N/A   N/A     N/A    0.00  35.0    GMI  20.0 -123.9   20.0 -123.9   20.4 -124.5 Analysis Plot     
     20170820 230300 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI17  20.0 -123.7   20.0 -123.7   21.2 -123.7 Analysis Plot     
     20170821 042900 -930.0      N/A   N/A     N/A    0.00  35.0  AMSR2  20.1 -124.5   20.1 -124.5   20.4 -124.6 Analysis Plot     
     20170821 101600   -4.1      N/A   9.1% 255.53    4.10  35.0 SSMI17  20.6 -123.1   20.6 -123.1   21.1 -122.8 Analysis Plot     
     20170821 191022 -930.0      N/A   N/A     N/A    0.00  45.0 SSMI15  20.3 -121.3   20.3 -121.3   19.5 -120.3 Analysis Plot     
     20170821 205600   -2.0      N/A   8.2% 166.65    1.99  45.0 SSMI16  20.3 -121.3   20.3 -121.3   21.1 -120.6 Analysis Plot     
     20170821 224800   -2.9      N/A  23.3% 222.20    2.90  45.0 SSMI17  20.5 -120.5   20.5 -120.5   20.8 -119.9 Analysis Plot     
     20170822 084824   17.5      N/A  56.2%  66.66   17.50  60.0    GMI  20.6 -118.0   20.4 -118.0   20.4 -118.0 Analysis Plot     
     20170822 103100   47.7  >65 kts 100.0%  88.88   32.67  60.0 SSMI18  20.6 -117.8   20.6 -117.8   20.5 -117.7 Analysis Plot     
     20170822 223500   57.5  >65 kts 100.0%  66.66   42.53  65.0 SSMI17  21.6 -114.9   21.3 -114.8   21.3 -114.8 Analysis Plot     
     20170822 230400   85.3  >85 kts 100.0%  88.88   70.29  65.0 SSMI18  21.6 -114.7   21.5 -114.6   21.5 -114.6 Analysis Plot     
     20170823 091417   -0.0      N/A   N/A     N/A    0.00  85.0 SSMI15  22.2 -112.8   22.1 -112.3   22.1 -112.3 Analysis Plot     
     20170823 102000   26.3  >65 kts  97.3%  33.33   11.27  85.0 SSMI18  22.4 -112.0   22.5 -111.5   22.5 -111.5 Analysis Plot     
     20170823 203607    5.7      N/A   N/A   33.33    5.73  85.0 SSMI15  23.1 -109.1   23.7 -108.6   23.7 -108.6 Analysis Plot     
     20170823 213700    7.1      N/A   N/A   33.33    7.06  85.0 SSMI16  23.1 -108.9   23.9 -108.1   23.9 -108.1 Analysis Plot     
     20170823 224911    1.8      N/A   2.7%  77.77    1.80  85.0    GMI  23.3 -108.3   23.6 -107.6   23.6 -107.6 Analysis Plot     
     20170823 225300 -930.0      N/A   N/A     N/A    0.00  85.0 SSMI18  23.3 -108.2   23.3 -108.2   23.5 -107.8 Analysis Plot     
     20170824 000300    7.8      N/A   2.7%  33.33    7.77  85.0 SSMI17  23.3 -107.9   23.5 -107.5   23.5 -107.5 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.