Tropical Storm 31L

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              
     20201113 180235   -2.4      N/A  15.1%  11.11    2.44  30.0  AMSR2  14.1   74.5   14.1   74.5   14.4   73.9 Analysis Plot     
     20201113 221413 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI18  13.8   74.3   13.8   74.3   14.4   74.4 Analysis Plot     
     20201114 061639   -4.5      N/A  30.1%  88.88    4.49  35.0  AMSR2  13.5   74.4   13.5   74.4   13.3   74.9 Analysis Plot     
     20201114 105535 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI15  13.5   74.6   13.5   74.6   12.6   73.6 Analysis Plot     
     20201114 184449    N/A      N/A   N/A     N/A     N/A  35.0  AMSR2  12.7   76.5   12.7   76.5   12.7   76.5 Analysis Plot     
     20201114 215027    N/A      N/A   N/A     N/A     N/A  45.0 SSMI18  12.6   76.5   12.6   76.5   12.7   76.7 Analysis Plot     
     20201114 233042   -2.1      N/A  26.0% 155.54    2.09  45.0 SSMI18  12.6   76.6   12.6   76.6   13.0   76.7 Analysis Plot     
     20201115 065915   19.1      N/A  30.1%  55.55   19.15  65.0  AMSR2  13.1   77.1   13.1   77.2   13.1   77.2 Analysis Plot     
     20201115 114136    8.9      N/A  12.3%  44.44    8.86  65.0 SSMI18  13.2   77.5   13.2   77.8   13.2   77.8 Analysis Plot     
     20201115 214904   47.6  >65 kts 100.0%  22.22   32.57  80.0 SSMI16  13.3   79.3   13.2   79.6   13.2   79.6 Analysis Plot     
     20201115 231959   48.5  >65 kts 100.0%  33.33   33.46  80.0 SSMI18  13.4   79.5   13.3   79.6   13.3   79.6 Analysis Plot     
     20201116 095244   64.8  >85 kts 100.0%  22.22   49.79 120.0 SSMI15  13.6   81.3   13.6   81.3   13.6   81.3 Analysis Plot     
     20201116 112903   49.1  >65 kts 100.0%  22.22   34.06 120.0 SSMI18  13.6   81.3   13.6   81.3   13.6   81.3 Analysis Plot     
     20201116 114211   55.1  >65 kts 100.0%  22.22   40.12 120.0 SSMI16  13.6   81.3   13.6   81.4   13.6   81.4 Analysis Plot     
     20201116 183326 -930.0      N/A   N/A     N/A    0.00 140.0  AMSR2  13.5   82.4   13.5   82.4   13.5   82.4 Analysis Plot     
     20201116 213340   50.9  >65 kts 100.0%  22.22   35.89 140.0 SSMI16  13.6   82.7   13.5   82.7   13.5   82.7 Analysis Plot     
     20201117 064817   66.3  >85 kts 100.0%  22.22   51.31 140.0  AMSR2  13.6   84.0   13.7   83.9   13.7   83.9 Analysis Plot     
     20201117 093746    N/A      N/A   N/A     N/A     N/A 115.0 SSMI15  13.7   84.4   13.8   84.3   13.8   84.3 Analysis Plot     
     20201117 111625    N/A      N/A   N/A     N/A     N/A 115.0 SSMI18  13.7   84.5   13.6   84.5   13.6   84.5 Analysis Plot     
     20201117 113314    N/A      N/A   N/A     N/A     N/A 115.0 SSMI16  13.7   84.5   13.8   84.7   13.8   84.7 Analysis Plot     
     20201117 191558    5.5      N/A   N/A   22.22    5.50  75.0  AMSR2  13.7   85.8   13.7   85.8   13.9   85.7 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.