Tropical Depression 17W

Passive Microwave (PMW) Intensity Information
Hurricane Intensity Estimation (HIE) Algorithm
Version 9.0
 

         Overpass     Inten           Ring    Ring          Wind           Forecast        Final        Target  
       Date    Time   Score  Meaning   Pct    Diam  BTdiff   Est   Sat    Lat    Lon    Lat    Lon    Lat    Lon              
     20210902 060027 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI16  27.5 -159.0   27.5 -159.0   28.3 -157.9 Analysis Plot     
     20210902 065758 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI18  27.6 -158.9   27.6 -158.9   28.4 -158.1 Analysis Plot     
     20210902 085954 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI17  27.4 -158.7   27.4 -158.7   28.0 -158.4 Analysis Plot     
     20210902 154111 -930.0      N/A   N/A     N/A    0.00  30.0  AMSR2  28.1 -158.7   28.1 -158.7   28.6 -158.3 Analysis Plot     
     20210902 190416 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI18  28.4 -158.6   28.4 -158.6   29.3 -157.9 Analysis Plot     
     20210902 194932 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI16  28.5 -158.6   28.5 -158.6   29.4 -157.8 Analysis Plot     
     20210902 210529 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI17  29.5 -158.2   29.5 -158.2   29.5 -158.1 Analysis Plot     
     20210903 023941 -930.0      N/A   N/A     N/A    0.00  30.0  AMSR2  30.1 -157.7   30.1 -157.7   29.8 -156.7 Analysis Plot     
     20210903 055338   -2.9      N/A   4.1% 188.87    2.89  30.0 SSMI16  30.7 -157.7   30.7 -157.7   31.2 -157.3 Analysis Plot     
     20210903 064600   -2.1      N/A   N/A  233.31    2.07  30.0 SSMI18  30.8 -157.7   30.8 -157.7   31.3 -157.4 Analysis Plot     
     20210903 084547 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI17  31.0 -157.9   31.0 -157.9   30.8 -158.2 Analysis Plot     
     20210903 144536 -930.0      N/A   N/A     N/A    0.00  30.0  AMSR2  32.3 -158.7   32.3 -158.7   32.1 -158.4 Analysis Plot     
     20210903 185211 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI18  32.9 -159.1   32.9 -159.1   33.3 -159.1 Analysis Plot     
     20210903 191214   -2.6      N/A   4.1% 299.97    2.61  25.0 SSMI16  33.0 -159.7   33.0 -159.7   33.2 -159.4 Analysis Plot     
     20210903 205301 -930.0      N/A   N/A     N/A    0.00  25.0 SSMI17  33.4 -160.1   33.4 -160.1   33.4 -159.4 Analysis Plot     
     20210904 014720 -930.0      N/A   N/A     N/A    0.00  25.0  AMSR2  34.8 -161.3   34.8 -161.3   35.1 -161.6 Analysis Plot     
     20210904 054034   -1.4      N/A   N/A   66.66    1.43  25.0 SSMI16  35.7 -162.1   35.7 -162.1   36.0 -162.0 Analysis Plot     
     20210904 063258   -1.2      N/A   N/A   33.33    1.23  25.0 SSMI18  35.9 -162.3   35.9 -162.3   36.0 -161.9 Analysis Plot     
     20210904 071646 -930.0      N/A   N/A     N/A    0.00  25.0 SSMI17  36.0 -162.4   36.0 -162.4   36.3 -162.4 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.