Tropical Depression 18L

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              
     20200907 141627 -930.0      N/A   N/A     N/A    0.00  30.0  AMSR2  15.6   21.0   15.6   21.0   15.6   20.6 Analysis Plot     
     20200907 174738   -2.1      N/A   N/A   22.22    2.11  30.0 SSMI18  15.8   21.5   15.8   21.5   16.1   21.5 Analysis Plot     
     20200908 070341   -3.7      N/A   2.7% 211.09    3.74  35.0 SSMI18  16.3   24.2   16.3   24.2   16.7   24.8 Analysis Plot     
     20200908 180534   -1.8      N/A   N/A   44.44    1.77  35.0 SSMI16  16.6   27.0   16.6   27.0   16.9   27.2 Analysis Plot     
     20200909 031200 -930.0      N/A   N/A     N/A    0.00  30.0  AMSR2  17.0   29.5   17.0   29.5   17.3   29.4 Analysis Plot     
     20200909 060616   -4.2      N/A  16.4%  55.55    4.18  30.0 SSMI15  17.2   30.0   17.2   30.0   17.2   29.6 Analysis Plot     
     20200909 075607   -0.9      N/A  46.6%  66.66     .92  30.0 SSMI16  17.2   30.1   17.2   30.1   17.7   30.2 Analysis Plot     
     20200909 175227 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI16  17.7   31.9   17.7   31.9   17.9   32.2 Analysis Plot     
     20200909 185831   -1.5      N/A   9.6% 222.20    1.46  35.0 SSMI18  17.8   32.0   17.8   32.0   18.1   32.5 Analysis Plot     
     20200910 052610  -21.0      N/A 100.0%  22.22    5.99  35.0    GMI  18.1   34.4   18.1   34.4   18.1   35.0 Analysis Plot     
     20200910 070937 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI16  18.1   34.6   18.1   34.6   18.0   35.0 Analysis Plot     
     20200910 082136  -15.6      N/A 100.0%  22.22     .57  35.0 SSMI18  18.2   34.8   18.2   34.8   18.3   35.5 Analysis Plot     
     20200910 184420    N/A      N/A   N/A     N/A     N/A  45.0    GMI  18.8   36.3   18.8   36.3   18.7   36.6 Analysis Plot     
     20200910 185759    N/A      N/A   N/A     N/A     N/A  45.0 SSMI18  18.7   36.2   18.7   36.2   18.6   36.3 Analysis Plot     
     20200911 080843   -4.2      N/A   5.5% 144.43    4.17  40.0 SSMI18  19.5   38.3   19.5   38.3   19.8   38.3 Analysis Plot     
     20200911 185739   -2.5      N/A  12.3%  99.99    2.46  35.0 SSMI16  20.6   40.5   20.6   40.5   20.7   40.7 Analysis Plot     
     20200912 051519 -930.0      N/A   N/A     N/A    0.00  35.0    GMI  21.7   42.8   21.7   42.8   21.6   42.6 Analysis Plot     
     20200912 070618   -2.5      N/A   6.2% 199.98    2.55  35.0 SSMI15  21.9   43.1   21.9   43.1   22.4   43.1 Analysis Plot     
     20200912 085529   -2.3      N/A   6.8% 177.76    2.32  35.0 SSMI16  22.3   43.3   22.3   43.3   22.6   43.6 Analysis Plot     
     20200912 161420   -5.5      N/A   N/A  155.54    5.51  30.0  AMSR2  23.3   44.5   23.3   44.5   23.6   44.9 Analysis Plot     
     20200912 183446   -4.7      N/A   N/A  188.87    4.69  30.0    GMI  23.7   45.0   23.7   45.0   24.0   45.2 Analysis Plot     
     20200912 184931   -1.3      N/A   N/A   88.88    1.35  30.0 SSMI16  23.6   44.9   23.6   44.9   24.0   45.1 Analysis Plot     
     20200912 195837   -2.7      N/A   4.1% 188.87    2.68  30.0 SSMI18  23.8   45.0   23.8   45.0   24.1   45.4 Analysis Plot     
     20200912 213816   -2.6      N/A   N/A  133.32    2.58  30.0 SSMI18  24.3   45.6   24.3   45.6   24.2   45.7 Analysis Plot     
     20200913 042403 -930.0      N/A   N/A     N/A    0.00  25.0  AMSR2  25.6   46.6   25.6   46.6   25.6   46.5 Analysis Plot     
     20200913 084248   -0.2      N/A   4.1% 144.43     .23  25.0 SSMI16  26.0   47.0   26.0   47.0   26.2   47.1 Analysis Plot     
     20200913 095820   -0.9      N/A  30.1%  33.33     .93  25.0 SSMI18  26.2   47.1   26.2   47.1   26.2   47.0 Analysis Plot     
     20200913 194618   -1.3      N/A   5.5% 133.32    1.29  25.0 SSMI18  27.1   47.9   27.1   47.9   26.9   47.5 Analysis Plot     
     20200913 212529   -1.3      N/A   4.1%  99.99    1.31  25.0 SSMI18  27.3   47.6   27.3   47.6   27.1   47.4 Analysis Plot     
     20200914 050456 -930.0      N/A   N/A     N/A    0.00  25.0    GMI  27.2   48.0   27.2   48.0   27.5   48.7 Analysis Plot     
     20200914 050512   -5.0      N/A   N/A   88.88    4.99  25.0  AMSR2  27.2   48.0   27.2   48.0   27.2   47.9 Analysis Plot     
     20200914 090603   -2.5      N/A  12.3% 144.43    2.52  25.0 SSMI15  27.4   48.3   27.4   48.3   27.5   48.2 Analysis Plot     
     20200914 093617   -1.0      N/A  17.8% 111.10     .99  25.0 SSMI18  27.4   48.3   27.4   48.3   27.7   48.2 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.