Tropical Depression 09W

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              
     20200821 214635   -2.9      N/A   9.6% 222.20    2.94  25.0 SSMI16  23.4 -122.4   23.4 -122.4   23.0 -122.3 Analysis Plot     
     20200822 081446   -1.5      N/A  21.9% 111.10    1.46  45.0 SSMI16  24.4 -123.2   24.4 -123.2   23.9 -123.6 Analysis Plot     
     20200822 231447 -930.0      N/A   N/A     N/A    0.00  50.0 SSMI16  26.0 -123.9   26.0 -123.9   25.5 -123.4 Analysis Plot     
     20200823 050659    N/A      N/A   N/A     N/A     N/A  55.0  AMSR2  26.6 -124.3   26.6 -124.3   26.6 -124.3 Analysis Plot     
     20200823 080140    5.8      N/A   8.2%  66.66    5.77  65.0 SSMI16  26.8 -124.5   26.5 -124.7   26.5 -124.7 Analysis Plot     
     20200823 171400    5.7      N/A  31.5% 188.87    5.68  70.0  AMSR2  27.4 -125.6   27.2 -125.1   27.2 -125.1 Analysis Plot     
     20200823 212024    2.3      N/A  30.1% 155.54    2.27  65.0 SSMI16  27.2 -125.6   27.1 -125.5   27.1 -125.5 Analysis Plot     
     20200824 074835   14.7      N/A  28.8%  77.77   14.72  75.0 SSMI16  27.8 -126.6   27.8 -126.6   27.9 -126.6 Analysis Plot     
     20200824 210710   18.2      N/A  37.0%  44.44   18.21  90.0 SSMI16  28.8 -126.0   28.8 -126.1   28.8 -126.1 Analysis Plot     
     20200824 221745   47.7  >65 kts 100.0%  66.66   32.75  90.0 SSMI18  28.9 -126.0   28.8 -125.9   28.8 -125.9 Analysis Plot     
     20200825 073527   25.4  >65 kts  45.2%  55.55   25.41  90.0 SSMI16  29.9 -125.3   29.8 -125.4   29.8 -125.4 Analysis Plot     
     20200825 093011   21.1  >65 kts  47.9%  55.55   21.08  90.0 SSMI15  29.9 -125.3   29.9 -125.4   29.9 -125.4 Analysis Plot     
     20200825 103617   24.6  >65 kts  15.1%  66.66   24.64  90.0 SSMI18  30.2 -125.1   30.0 -125.3   30.0 -125.3 Analysis Plot     
     20200825 221456   19.3      N/A  23.3%  99.99   19.35  95.0 SSMI18  32.0 -124.7   31.8 -124.7   31.8 -124.7 Analysis Plot     
     20200826 202302 -930.0      N/A   N/A     N/A    0.00  80.0 SSMI15  37.5 -124.5   37.5 -124.5   37.0 -124.2 Analysis Plot     
     20200826 215114    1.4      N/A   2.7% 222.20    1.38  80.0 SSMI18  38.0 -124.6   38.0 -124.6   37.9 -124.2 Analysis Plot     
     20200827 083239   -0.5      N/A   N/A   11.11     .48  40.0 SSMI18  42.0 -126.1   42.0 -126.1   42.0 -125.6 Analysis Plot     
     20200827 213814   -0.8      N/A   N/A  288.86     .76  40.0 SSMI18  45.7 -129.0   45.7 -129.0   45.7 -129.1 Analysis Plot     
     20200828 035304 -930.0      N/A   N/A     N/A    0.00  40.0  AMSR2  46.4 -129.8   46.4 -129.8   45.6 -130.2 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.