Tropical Depression 30W

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              
     20171109 200950   -0.0      N/A   N/A     N/A    0.00  30.0 SSMI15  14.4 -120.1   14.4 -120.1   14.8 -119.9 Analysis Plot     
     20171110 082900   -9.6      N/A  27.4%  33.33    9.55  35.0 SSMI16  15.9 -118.2   15.9 -118.2   16.2 -118.1 Analysis Plot     
     20171110 094909  -19.9      N/A  28.8%  33.33   19.88  35.0    GMI  16.3 -117.7   16.3 -117.7   16.5 -118.0 Analysis Plot     
     20171110 104800  -15.8      N/A  82.2%  33.33   15.81  35.0 SSMI17  16.3 -117.6   16.3 -117.6   16.6 -117.8 Analysis Plot     
     20171110 192519   -0.3      N/A  47.9% 122.21     .25  40.0 SSMI15  17.1 -116.8   17.1 -116.8   17.1 -116.3 Analysis Plot     
     20171110 230540  -25.1      N/A  98.6%  33.33   10.12  40.0    GMI  17.3 -116.4   17.3 -116.4   17.6 -116.2 Analysis Plot     
     20171110 232300   -0.0      N/A   N/A     N/A    0.00  40.0 SSMI17  17.4 -116.3   17.4 -116.3   17.5 -116.1 Analysis Plot     
     20171111 081400   -4.6      N/A  15.1% 144.43    4.59  35.0 SSMI16  17.7 -114.9   17.7 -114.9   18.0 -114.7 Analysis Plot     
     20171111 103200 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI18  17.7 -114.6   17.7 -114.6   18.0 -114.4 Analysis Plot     
     20171111 103500   -4.8      N/A   1.4% 133.32    4.79  35.0 SSMI17  17.7 -114.6   17.7 -114.6   18.1 -114.3 Analysis Plot     
     20171111 180410   -2.7      N/A   N/A   22.22    2.69  30.0  AMSR2  17.7 -113.2   17.7 -113.2   18.1 -113.4 Analysis Plot     
     20171111 230900   -4.2      N/A   N/A  244.42    4.16  30.0 SSMI17  17.5 -112.6   17.5 -112.6   17.7 -113.0 Analysis Plot     
     20171112 080100 -930.0      N/A   N/A     N/A    0.00  25.0 SSMI16  17.5 -112.3   17.5 -112.3   17.6 -112.2 Analysis Plot     
     20171112 091729   -2.4      N/A   N/A  177.76    2.44  25.0 SSMI15  17.5 -112.3   17.5 -112.3   17.5 -112.1 Analysis Plot     
     20171112 093908   -2.9      N/A   N/A  122.21    2.91  25.0    GMI  17.4 -112.0   17.4 -112.0   17.3 -112.0 Analysis Plot     
     20171112 102000   -5.0      N/A   N/A  155.54    5.02  25.0 SSMI18  17.5 -112.0   17.5 -112.0   17.4 -112.2 Analysis Plot     
     20171112 102300 -930.0      N/A   N/A     N/A    0.00  25.0 SSMI17  17.4 -112.0   17.4 -112.0   17.4 -112.2 Analysis Plot     
     20171112 212800   -1.4      N/A  19.2%  22.22    1.43  25.0 SSMI16  17.2 -111.1   17.2 -111.1   17.9 -111.1 Analysis Plot     
     20171112 225533 -930.0      N/A   N/A     N/A    0.00  25.0    GMI  17.1 -110.8   17.1 -110.8   17.8 -110.5 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.