Tropical Storm 21W

Passive Microwave (PMW) Intensity Information
Advanced Dvorak Technique (ADT)
Version 8.1.5


         Overpass     Inten           Ring    Ring          Wind           Forecast        Final        Target  
       Date    Time   Score  Meaning   Pct    Diam  BTdiff   Est   Sat    Lat    Lon    Lat    Lon    Lat    Lon              
     20130930 020520 -930.0      N/A   N/A  244.42   19.09  30.0   TRMM  26.7 -146.4   26.7 -146.4   26.6 -145.6 Analysis Plot     
     20130930 074200   -3.7      N/A   N/A   88.88    3.72  30.0 SSMI17  27.3 -145.0   27.3 -145.0   27.7 -144.5 Analysis Plot     
     20130930 102400   -0.2      N/A   N/A  144.43     .18  30.0 SSMI18  27.6 -144.4   27.6 -144.4   27.6 -143.9 Analysis Plot     
     20130930 183047   -4.9      N/A   8.2% 188.87    4.93  30.0 SSMI15  28.7 -142.7   28.7 -142.7   28.0 -142.2 Analysis Plot     
     20130930 201435 -930.0      N/A   N/A  199.98    8.25  30.0   TRMM  28.8 -141.9   28.8 -141.9   28.4 -141.6 Analysis Plot     
     20130930 215227 -930.0      N/A   N/A  111.10    9.80  30.0   TRMM  28.9 -141.7   28.9 -141.7   28.5 -142.4 Analysis Plot     
     20131001 010820 -930.0      N/A   N/A  133.32    7.33  30.0   TRMM  29.1 -141.7   29.1 -141.7   29.6 -141.6 Analysis Plot     
     20131001 010826 -930.0      N/A   N/A  244.42   16.87  30.0   TRMM  29.3 -141.6   29.3 -141.6   28.8 -142.4 Analysis Plot     
     20131001 073200 -930.0      N/A   N/A  299.97    3.47  35.0 SSMI17  30.3 -141.5   30.3 -141.5   30.2 -141.7 Analysis Plot     
     20131001 101200   -4.4      N/A   5.5% 222.20    4.38  35.0 SSMI18  30.9 -141.5   30.9 -141.5   30.7 -141.0 Analysis Plot     
     20131001 182013   -2.1      N/A   N/A   44.44    2.05  35.0 SSMI15  32.4 -141.8   32.4 -141.8   32.0 -141.0 Analysis Plot     
     20131001 205722 -930.0      N/A   N/A  199.98    7.57  35.0   TRMM  33.3 -141.5   33.3 -141.5   33.7 -141.5 Analysis Plot     
     20131001 205726 -930.0      N/A   N/A   55.55    6.07  35.0   TRMM  33.7 -141.7   33.7 -141.7   33.0 -141.3 Analysis Plot     
     20131001 223800   -0.3      N/A  21.9%  33.33     .33  35.0 SSMI18  34.1 -141.8   34.1 -141.8   33.5 -141.5 Analysis Plot     
     20131002 001302   -3.3      N/A  27.4%  44.44    3.34  35.0   TRMM  34.2 -141.9   34.2 -141.9   33.7 -141.7 Analysis Plot     
     20131002 072000 -930.0      N/A   N/A  166.65    3.57  35.0 SSMI17  35.9 -142.8   35.9 -142.8   35.9 -142.6 Analysis Plot     
     20131002 100200   -1.9      N/A  28.8% 188.87    1.86  35.0 SSMI18  37.4 -143.5   37.4 -143.5   37.0 -143.2 Analysis Plot     
     20131002 201400 -930.0      N/A   N/A  166.65    4.92  35.0 SSMI16  40.8 -145.1   40.8 -145.1   41.5 -146.9 Analysis Plot     
     20131002 212300 -930.0      N/A   N/A  122.21    8.56  35.0 SSMI17  41.2 -145.3   41.2 -145.3   41.3 -143.4 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.