Tropical Depression 24W

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              
     20171012 075100   -2.4      N/A   4.1% 288.86    2.40  30.0 SSMI16  17.7 -124.1   17.7 -124.1   18.0 -124.5 Analysis Plot     
     20171012 173952   -3.1      N/A  13.7%  33.33    3.08  35.0    GMI  17.8 -122.2   17.8 -122.2   18.0 -122.1 Analysis Plot     
     20171012 213000 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI16  18.1 -121.8   18.1 -121.8   17.3 -122.0 Analysis Plot     
     20171013 065658 -930.0      N/A   N/A     N/A    0.00  35.0    GMI  17.9 -119.8   17.9 -119.8   18.0 -119.8 Analysis Plot     
     20171013 074900   -1.1      N/A  17.8% 188.87    1.12  45.0 SSMI16  17.4 -119.0   17.4 -119.0   17.5 -119.4 Analysis Plot     
     20171013 211700   -2.8      N/A  15.1% 188.87    2.76  50.0 SSMI16  17.0 -118.4   17.0 -118.4   17.5 -119.0 Analysis Plot     
     20171014 073100    3.0      N/A  47.9% 111.10    2.95  60.0 SSMI16  17.7 -117.8   17.7 -117.8   18.0 -118.0 Analysis Plot     
     20171014 172928   22.4  >65 kts  34.2%  33.33   22.42  60.0    GMI  18.9 -116.3   19.5 -116.4   19.5 -116.4 Analysis Plot     
     20171014 210300   42.1  >65 kts 100.0%  44.44   27.10  70.0 SSMI16  19.5 -116.3   19.8 -115.9   19.8 -115.9 Analysis Plot     
     20171015 064730    1.6      N/A  23.8% 133.32    1.59  75.0    GMI  20.3 -113.3   20.3 -113.3   20.6 -113.7 Analysis Plot     
     20171015 182209 -930.0      N/A   N/A     N/A    0.00  65.0  AMSR2  21.0 -109.7   21.0 -109.7   20.7 -110.6 Analysis Plot     
     20171015 222100 -930.0      N/A   N/A     N/A    0.00  65.0 SSMI16  20.9 -109.3   20.9 -109.3   22.2 -110.0 Analysis Plot     
     20171016 084200   -0.8      N/A   N/A   99.99     .83  25.0 SSMI16  20.3 -109.3   20.3 -109.3   19.3 -109.6 Analysis Plot     
     20171016 171900 -930.0      N/A   N/A     N/A    0.00  25.0    GMI  20.1 -108.9   20.1 -108.9   19.6 -109.4 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.