Tropical Storm 21W

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              
     20170911 221900   -0.0      N/A  63.0% 199.98     .04  25.0 SSMI18  15.1 -122.4   15.1 -122.4   14.6 -121.8 Analysis Plot     
     20170912 031001   -7.1      N/A  12.3%  55.55    7.14  25.0    GMI  14.8 -121.5   14.8 -121.5   14.6 -121.1 Analysis Plot     
     20170912 081148   -1.8      N/A  37.0%  11.11    1.81  25.0 SSMI15  15.0 -121.1   15.0 -121.1   14.9 -120.9 Analysis Plot     
     20170912 102400   -6.0      N/A  24.7% 144.43    6.02  25.0 SSMI17  14.5 -119.4   14.5 -119.4   14.5 -119.4 Analysis Plot     
     20170912 202608   -7.6      N/A  37.0%  55.55    7.64  35.0 SSMI15  14.6 -117.3   14.6 -117.4   14.6 -117.4 Analysis Plot     
     20170912 210700   -8.5      N/A  71.2%  66.66    8.46  35.0 SSMI16  14.6 -117.3   14.4 -117.3   14.4 -117.3 Analysis Plot     
     20170912 230000   -5.7      N/A   4.1% 166.65    5.67  35.0 SSMI17  14.7 -116.8   14.7 -116.8   14.8 -117.0 Analysis Plot     
     20170913 200937    6.2      N/A  23.3% 244.42    6.18  60.0 SSMI15  15.8 -113.2   16.0 -113.1   16.0 -113.1 Analysis Plot     
     20170913 224700   16.8      N/A  17.8% 122.21   16.82  60.0 SSMI17  16.0 -112.6   16.1 -112.6   16.1 -112.6 Analysis Plot     
     20170914 025858   15.8      N/A  42.5% 111.10   15.76  65.0    GMI  16.4 -111.7   16.4 -111.5   16.4 -111.5 Analysis Plot     
     20170914 091600   12.3      N/A  64.4%  77.77   12.28  75.0 SSMI16  16.6 -110.9   16.7 -110.4   16.7 -110.4 Analysis Plot     
     20170914 161601   44.9  >65 kts 100.0%  55.55   29.95  85.0    GMI  17.4 -109.0   17.2 -109.1   17.2 -109.1 Analysis Plot     
     20170914 220100 -930.0      N/A   N/A     N/A    0.00  90.0 SSMI16  17.8 -108.2   17.6 -107.9   17.6 -107.9 Analysis Plot     
     20170915 085300    8.6      N/A  69.9%  55.55    8.59  80.0 SSMI16  18.0 -105.7   18.0 -105.7   17.6 -105.9 Analysis Plot     
     20170915 094848    5.5      N/A  74.0%  44.44    5.54  80.0 SSMI15  17.9 -105.7   17.7 -106.1   17.7 -106.1 Analysis Plot     
     20170915 103700    2.8      N/A   N/A   88.88    2.82  80.0 SSMI18  18.0 -105.1   18.0 -105.1   18.1 -105.8 Analysis Plot     
     20170915 112700 -930.0      N/A   N/A     N/A    0.00  80.0 SSMI17  18.1 -104.9   18.1 -104.9   18.7 -105.2 Analysis Plot     
     20170915 210938    5.1      N/A   N/A  155.54    5.12  80.0 SSMI15  18.5 -102.7   18.5 -102.7   19.3 -103.0 Analysis Plot     
     20170915 215900    2.1      N/A   N/A   55.55    2.12  80.0 SSMI16  18.5 -102.7   18.5 -102.7   18.4 -102.1 Analysis Plot     
     20170915 231100 -930.0      N/A   N/A     N/A    0.00  80.0 SSMI18  18.7 -102.1   18.7 -102.1   18.3 -101.8 Analysis Plot     
     20170916 000100    1.1      N/A   2.7%  66.66    1.13  80.0 SSMI17  18.8 -101.9   18.8 -101.9   18.7 -101.0 Analysis Plot     
     20170916 024812    0.2      N/A   N/A   44.44     .22  80.0    GMI  18.9 -101.3   18.9 -101.3   19.2 -100.3 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.