Tropical Depression 04B

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              
     20171208 215908   -9.1      N/A   N/A   77.77    9.11  40.0 SSMI15  18.8  -86.9   18.8  -86.9   18.8  -86.5 Analysis Plot     
     20171209 001500   -0.4      N/A   N/A   44.44     .36  40.0 SSMI18  19.4  -86.9   19.4  -86.9   18.8  -87.1 Analysis Plot     
     20171209 032912   -3.4      N/A   N/A  133.32    3.44  40.0    GMI  19.8  -87.0   19.8  -87.0   19.4  -86.6 Analysis Plot     
     20171209 103300   -1.2      N/A   N/A   11.11    1.24  35.0 SSMI16  19.1  -86.9   19.1  -86.9   19.6  -86.7 Analysis Plot     
     20171209 124900   -2.0      N/A   N/A   22.22    2.04  35.0 SSMI17  19.4  -87.0   19.4  -87.0   19.5  -86.6 Analysis Plot     
     20171209 214858   -2.9      N/A   N/A   44.44    2.92  35.0 SSMI15  20.4  -87.7   20.4  -87.7   20.8  -87.6 Analysis Plot     
     20171210 000300 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI18  20.7  -87.9   20.7  -87.9   20.6  -87.4 Analysis Plot     
     20171210 023704 -930.0      N/A   N/A     N/A    0.00  35.0    GMI  20.9  -88.2   20.9  -88.2   20.6  -88.2 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.