Tropical Depression 21W

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              
     20221012 160354 -930.0      N/A   N/A     N/A    0.00  25.0  AMSR2  15.2 -151.6   15.2 -151.6   15.0 -151.5 Analysis Plot     
     20221012 213531   -4.6      N/A   N/A  288.86    4.62  25.0 SSMI17  15.3 -152.3   15.3 -152.3   14.9 -152.2 Analysis Plot     
     20221013 025455   -6.8      N/A  23.3%  88.88    6.85  25.0  AMSR2  14.9 -151.7   14.9 -151.7   14.4 -152.2 Analysis Plot     
     20221013 081744 -930.0      N/A   N/A     N/A    0.00  25.0 SSMI18  15.2 -152.3   15.2 -152.3   15.4 -152.4 Analysis Plot     
     20221013 083223   -3.0      N/A   2.7% 144.43    2.99  25.0 SSMI16  15.6 -153.0   15.6 -153.0   15.1 -152.8 Analysis Plot     
     20221013 150725   -6.7      N/A  15.1%  66.66    6.71  30.0  AMSR2  16.6 -154.5   16.6 -154.5   15.6 -154.8 Analysis Plot     
     20221013 212228   -1.1      N/A   8.2% 122.21    1.11  30.0 SSMI17  17.5 -155.4   17.5 -155.4   17.3 -155.8 Analysis Plot     
     20221014 073459   -3.3      N/A   6.8% 111.10    3.33  30.0 SSMI17  21.1 -156.1   21.1 -156.1   21.6 -156.8 Analysis Plot     
     20221014 081913   -7.9      N/A  12.3%  44.44    7.93  35.0 SSMI16  21.8 -156.6   21.8 -156.6   21.5 -157.2 Analysis Plot     
     20221014 154820   -5.3      N/A   N/A   11.11    5.27  30.0  AMSR2  24.7 -155.9   24.7 -155.9   24.8 -155.1 Analysis Plot     
     20221014 202905   -1.9      N/A  15.1% 111.10    1.86  40.0 SSMI16  27.4 -158.4   27.4 -158.4   27.8 -158.2 Analysis Plot     
     20221014 210859   -1.2      N/A  19.2%  77.77    1.16  40.0 SSMI17  27.6 -158.4   27.6 -158.4   28.0 -158.6 Analysis Plot     
     20221015 024546   -3.3      N/A  32.9%  22.22    3.26  40.0  AMSR2  29.8 -159.2   29.8 -159.2   29.0 -159.5 Analysis Plot     
     20221015 072109   -0.8      N/A   N/A   22.22     .83  40.0 SSMI17  30.9 -159.9   30.9 -159.9   30.8 -160.1 Analysis Plot     
     20221015 080607 -930.0      N/A   N/A     N/A    0.00  40.0 SSMI16  31.1 -160.0   31.1 -160.0   31.1 -160.1 Analysis Plot     
     20221015 145031 -930.0      N/A   N/A     N/A    0.00  40.0  AMSR2  32.5 -161.8   32.5 -161.8   33.0 -161.2 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.