Tropical Depression 04W


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              
     20180512 033653   -5.5      N/A  19.2% 222.20    5.52  30.0  AMSR2  18.8 -148.5   18.8 -148.5   18.5 -148.5 Analysis Plot     
     20180512 063725   -4.6      N/A  13.7% 199.98    4.63  30.0 SSMI15  18.9 -148.4   18.9 -148.4   18.7 -148.4 Analysis Plot     
     20180512 080300   -7.7      N/A  11.0% 188.87    7.69  30.0 SSMI18  19.3 -147.8   19.3 -147.8   19.2 -148.0 Analysis Plot     
     20180512 085300   -6.4      N/A   4.1% 166.65    6.38  30.0 SSMI17  19.4 -147.7   19.4 -147.7   19.3 -147.7 Analysis Plot     
     20180512 154809   -3.6      N/A   N/A   22.22    3.57  35.0  AMSR2  19.0 -146.5   19.0 -146.5   19.0 -147.1 Analysis Plot     
     20180512 175203   -2.1      N/A   N/A   55.55    2.13  35.0 SSMI15  19.1 -146.3   19.1 -146.3   19.3 -147.3 Analysis Plot     
     20180512 203700   -3.5      N/A   4.1% 177.76    3.50  35.0 SSMI18  19.0 -146.4   19.0 -146.4   19.8 -146.6 Analysis Plot     
     20180512 212600   -4.9      N/A  13.7% 111.10    4.95  35.0 SSMI17  19.0 -146.3   19.0 -146.3   19.7 -147.0 Analysis Plot     
     20180513 014735   -6.6      N/A  11.0%  66.66    6.60  35.0    GMI  19.5 -146.3   19.5 -146.3   19.3 -146.7 Analysis Plot     
     20180513 055648   -8.0      N/A   N/A  177.76    8.01  35.0 SSMI15  19.7 -146.1   19.7 -146.1   19.6 -146.1 Analysis Plot     
     20180513 075200   -5.7      N/A  13.7% 133.32    5.65  30.0 SSMI18  20.4 -145.5   20.4 -145.5   20.4 -145.8 Analysis Plot     
     20180513 150552 -930.0      N/A   N/A     N/A    0.00  30.0    GMI  20.7 -144.8   20.7 -144.8   20.6 -144.5 Analysis Plot     
     20180513 163116   -3.9      N/A   N/A  177.76    3.95  30.0  AMSR2  20.9 -144.6   20.9 -144.6   21.0 -144.3 Analysis Plot     
     20180513 202400   -1.9      N/A   5.5% 255.53    1.94  25.0 SSMI18  21.0 -144.4   21.0 -144.4   21.2 -144.4 Analysis Plot     
     20180513 211200   -2.9      N/A   5.5% 277.75    2.87  25.0 SSMI17  21.1 -144.4   21.1 -144.4   21.2 -144.4 Analysis Plot     
     20180514 032545   -2.3      N/A  27.4%  22.22    2.29  25.0  AMSR2  21.7 -144.3   21.7 -144.3   21.8 -144.9 Analysis Plot     
     20180514 082600   -6.1      N/A  11.0%  99.99    6.12  25.0 SSMI17  22.3 -144.3   22.3 -144.3   22.8 -144.6 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.