Tropical Depression 20N_14

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              
     20221207 110852 -930.0      N/A   N/A     N/A    0.00  30.0    GMI   8.9  -84.6    8.9  -84.6    9.3  -84.8 Analysis Plot     
     20221207 120511   -1.7      N/A   5.5% 155.54    1.65  30.0 SSMI16   9.0  -84.6    9.0  -84.6    9.2  -85.5 Analysis Plot     
     20221207 231316 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI18   9.2  -84.2    9.2  -84.2   10.2  -84.5 Analysis Plot     
     20221208 013438 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI17   9.5  -83.9    9.5  -83.9   10.3  -84.0 Analysis Plot     
     20221208 115202   -1.9      N/A  16.4% 177.76    1.94  45.0 SSMI16  10.1  -82.6   10.1  -82.6   10.3  -83.2 Analysis Plot     
     20221209 011551   -1.0      N/A  11.8% 144.43     .97  50.0 SSMI16  11.1  -81.4   11.1  -81.4   11.5  -81.4 Analysis Plot     
     20221209 111013   -0.6      N/A  16.4%  99.99     .55  45.0 SSMI18  11.9  -80.6   11.9  -80.6   11.9  -81.3 Analysis Plot     
     20221209 114953 -930.0      N/A   N/A     N/A    0.00  45.0 SSMI16  11.9  -80.5   11.9  -80.5   12.3  -81.8 Analysis Plot     
     20221209 133209   -0.9      N/A   5.5%  66.66     .85  45.0 SSMI17  12.0  -80.4   12.0  -80.4   12.3  -81.2 Analysis Plot     
     20221210 010513   -1.8      N/A   4.1% 111.10    1.83  35.0 SSMI16  12.4  -80.0   12.4  -80.0   12.9  -80.1 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.