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              
     20220921 224113   -0.1      N/A   N/A   77.77     .11  25.0 SSMI17  26.0 -138.3   26.0 -138.3   26.5 -138.6 Analysis Plot     
     20220922 041745   -7.4      N/A   3.0% 288.86    7.43  25.0  AMSR2  26.6 -137.2   26.6 -137.2   26.5 -136.6 Analysis Plot     
     20220922 100547 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI16  27.5 -136.2   27.5 -136.2   27.3 -136.1 Analysis Plot     
     20220922 105055 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI17  27.6 -136.1   27.6 -136.1   27.5 -136.3 Analysis Plot     
     20220922 162435   -6.3      N/A   N/A  177.76    6.31  30.0  AMSR2  29.5 -135.7   29.5 -135.7   29.3 -135.2 Analysis Plot     
     20220922 210326 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI18  30.1 -135.5   30.1 -135.5   30.1 -135.8 Analysis Plot     
     20220922 215054   -2.6      N/A  11.0% 155.54    2.62  30.0 SSMI16  30.1 -135.0   30.1 -135.0   30.4 -135.2 Analysis Plot     
     20220922 224120   -3.5      N/A  13.7% 133.32    3.53  30.0 SSMI17  30.3 -135.0   30.3 -135.0   30.4 -135.2 Analysis Plot     
     20220923 095237   -2.5      N/A   N/A   55.55    2.46  30.0 SSMI16  32.5 -135.7   32.5 -135.7   32.3 -135.6 Analysis Plot     
     20220923 103718   -0.9      N/A   1.4% 233.31     .92  30.0 SSMI17  32.6 -135.8   32.6 -135.8   32.4 -136.0 Analysis Plot     
     20220923 170555    N/A      N/A   N/A     N/A     N/A  30.0  AMSR2  33.8 -136.9   33.8 -136.9   33.3 -136.7 Analysis Plot     
     20220923 205115 -930.0      N/A   N/A     N/A    0.00  25.0 SSMI18  33.1 -137.5   33.1 -137.5   33.4 -137.5 Analysis Plot     
     20220923 214035 -930.0      N/A   N/A     N/A    0.00  25.0 SSMI16  33.2 -137.7   33.2 -137.7   33.5 -137.9 Analysis Plot     
     20220923 221434   -0.7      N/A   N/A   33.33     .70  25.0 SSMI17  33.2 -137.8   33.2 -137.8   33.3 -138.1 Analysis Plot     
     20220924 040710 -930.0      N/A   N/A     N/A    0.00  20.0  AMSR2  33.4 -138.6   33.4 -138.6   33.5 -139.4 Analysis Plot     
     20220924 084239   -1.9      N/A   N/A  122.21    1.93  20.0 SSMI17  33.6 -139.2   33.6 -139.2   33.0 -137.9 Analysis Plot     
     20220924 093918   -1.5      N/A   N/A   22.22    1.50  20.0 SSMI16  33.6 -139.3   33.6 -139.3   34.1 -138.8 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.