Tropical Depression 04W

Passive Microwave (PMW) Intensity Information
Advanced Dvorak Technique (ADT)
Version 8.1.4 (experimental)


         Overpass     Inten           Ring    Ring          Wind           Forecast        Final        Target  
       Date    Time   Score  Meaning   Pct    Diam  BTdiff   Est   Sat    Lat    Lon    Lat    Lon    Lat    Lon              
     20130618 083600   -2.5      N/A   9.6% 222.20    2.50  35.0 SSMI16  18.9 -126.2   18.9 -126.2   19.0 -126.1 Analysis Plot     
     20130618 094725   -4.2      N/A   6.8%  33.33    4.20  35.0   TRMM  19.3 -126.2   19.3 -126.2   19.4 -126.9 Analysis Plot     
     20130618 111800   -2.0      N/A   8.2%  77.77    1.99  35.0 SSMI18  19.5 -126.2   19.5 -126.2   19.1 -127.3 Analysis Plot     
     20130618 211000   -2.1      N/A   8.2% 155.54    2.07  35.0 SSMI16  20.6 -126.4   20.6 -126.4   20.5 -126.5 Analysis Plot     
     20130618 235100   -3.6      N/A  17.8%  66.66    3.62  35.0 SSMI18  21.2 -126.4   21.2 -126.4   21.3 -125.3 Analysis Plot     
     20130619 082500  -15.0      N/A   N/A     N/A    4.29  35.0 SSMI16  23.0 -125.2   23.0 -125.2   24.0 -125.0 Analysis Plot     
     20130619 094200  -15.0      N/A   N/A     N/A    8.51  35.0 SSMI17  23.3 -125.2   23.3 -125.2   24.5 -125.5 Analysis Plot     
     20130619 110700   -5.2      N/A   N/A  177.76    5.22  35.0 SSMI18  23.6 -125.2   23.6 -125.2   24.6 -125.3 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 <50 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; -909 is a failure to process (bad input data).