Tropical Depression 21S

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              
     20220322 214724    N/A      N/A   N/A     N/A     N/A  80.0 SSMI18 -18.0 -108.9  -18.0 -108.9  -18.3 -109.1 Analysis Plot     
     20220323 011722   13.8      N/A  30.1%  55.55   13.79  75.0    GMI -18.4 -108.8  -18.7 -108.9  -18.7 -108.9 Analysis Plot     
     20220323 095506    N/A      N/A   N/A     N/A     N/A  70.0 SSMI18 -19.3 -108.0  -19.3 -108.0  -19.9 -109.0 Analysis Plot     
     20220323 113645 -930.0      N/A   N/A     N/A    0.00  75.0 SSMI17 -19.0 -108.3  -19.0 -108.3  -19.2 -108.1 Analysis Plot     
     20220323 181051    0.9      N/A   N/A   44.44     .86  65.0  AMSR2 -20.7 -107.4  -20.7 -107.4  -19.5 -107.6 Analysis Plot     
     20220323 213228   -3.0      N/A   N/A  199.98    3.05  50.0 SSMI18 -19.9 -106.7  -19.9 -106.7  -19.3 -107.2 Analysis Plot     
     20220323 225044   -1.1      N/A   N/A  222.20    1.11  50.0 SSMI16 -20.0 -106.6  -20.0 -106.6  -19.5 -106.6 Analysis Plot     
     20220324 062133    N/A      N/A   N/A     N/A     N/A  35.0  AMSR2 -20.7 -107.0  -20.7 -107.0  -21.7 -107.3 Analysis Plot     
     20220324 094219    N/A      N/A   N/A     N/A     N/A  35.0 SSMI18 -21.1 -106.9  -21.1 -106.9  -22.0 -107.4 Analysis Plot     
     20220324 105222 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI16 -21.3 -106.8  -21.3 -106.8  -22.5 -107.4 Analysis Plot     
     20220325 003412 -930.0      N/A   N/A     N/A    0.00  50.0 SSMI17 -25.3 -105.9  -25.3 -105.9  -25.7 -107.0 Analysis Plot     
     20220325 092927    N/A      N/A   N/A     N/A     N/A  50.0 SSMI18 -26.4 -106.0  -26.4 -106.0  -27.4 -106.8 Analysis Plot     
     20220325 103914   -3.7      N/A   N/A  166.65    3.73  50.0 SSMI16 -26.2 -105.9  -26.2 -105.9  -25.9 -105.7 Analysis Plot     
     20220325 125105   -1.6      N/A   N/A   99.99    1.63  50.0 SSMI17 -25.4 -105.6  -25.4 -105.6  -25.4 -105.4 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.