Tropical Depression 18W

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              
     20150906 210800   -2.9      N/A  19.2% 111.10    2.94  30.0 SSMI19  22.4 -138.9   22.4 -138.9   22.6 -139.0 Analysis Plot     
     20150907 005956   -6.3      N/A   9.6%  55.55    6.34  30.0    GMI  22.8 -138.8   22.8 -138.8   23.1 -138.5 Analysis Plot     
     20150907 081900   -4.3      N/A  26.0%  33.33    4.35  30.0 SSMI17  24.3 -138.3   24.3 -138.3   24.1 -138.9 Analysis Plot     
     20150907 102100   -3.9      N/A  45.2%  77.77    3.88  30.0 SSMI18  24.9 -138.2   24.9 -138.2   24.2 -138.4 Analysis Plot     
     20150907 204900   -0.4      N/A  45.2% 122.21     .37  35.0 SSMI17  26.1 -138.5   26.1 -138.5   27.0 -138.3 Analysis Plot     
     20150907 225000  -12.8      N/A  54.8%  99.99   12.76  35.0 SSMI18  26.3 -138.5   26.3 -138.5   27.4 -138.1 Analysis Plot     
     20150908 080800  -44.6      N/A 100.0%  66.66   29.57  45.0 SSMI17  29.5 -138.2   29.5 -138.2   30.0 -138.4 Analysis Plot     
     20150908 100900  -27.6      N/A  34.2%  44.44   27.62  45.0 SSMI18  30.4 -138.0   30.4 -138.0   30.6 -138.1 Analysis Plot     
     20150908 181719   29.9  >65 kts  94.5%  33.33   14.88  55.0 SSMI15  33.4 -138.0   33.4 -138.0   33.5 -137.6 Analysis Plot     
     20150908 223600   29.9      N/A   N/A     N/A    0.00  55.0 SSMI18  34.6 -137.4   34.6 -137.4   34.2 -137.1 Analysis Plot     
     20150909 064326   29.9      N/A   N/A     N/A    0.00  50.0 SSMI15  36.0 -136.6   36.0 -136.6   35.8 -137.7 Analysis Plot     
     20150909 094200   29.9      N/A   N/A     N/A    0.00  35.0 SSMI19  37.9 -135.7   37.9 -135.7   38.7 -135.9 Analysis Plot     
     20150909 095900   -2.4      N/A   N/A   33.33    2.36  35.0 SSMI18  38.0 -135.7   38.0 -135.7   38.2 -135.9 Analysis Plot     
     20150909 175945   -2.4      N/A   N/A     N/A    0.00  35.0 SSMI15  39.2 -134.8   39.2 -134.8   39.1 -135.4 Analysis Plot     
     20150909 220300   -2.4      N/A   N/A     N/A    0.00  35.0 SSMI19  39.8 -134.5   39.8 -134.5   39.6 -133.9 Analysis Plot     
     20150909 222200   -2.4      N/A   N/A     N/A    0.00  35.0 SSMI18  39.8 -134.5   39.8 -134.5   39.7 -134.1 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.