Tropical Storm 20W


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              
     20210922 152146 -930.0      N/A   N/A     N/A    0.00  25.0  AMSR2  11.6 -148.0   11.6 -148.0   11.9 -147.2 Analysis Plot     
     20210922 195052 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI18  11.9 -147.3   11.9 -147.3   12.3 -146.3 Analysis Plot     
     20210922 201118 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI16  11.9 -147.3   11.9 -147.3   12.3 -146.2 Analysis Plot     
     20210922 214653   -1.6      N/A   N/A  177.76    1.63  30.0 SSMI17  12.1 -147.0   12.1 -147.0   11.8 -147.3 Analysis Plot     
     20210923 034853 -930.0      N/A   N/A     N/A    0.00  30.0  AMSR2  12.6 -145.4   12.6 -145.4   12.8 -145.1 Analysis Plot     
     20210923 073509 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI18  13.0 -145.4   13.0 -145.4   13.4 -145.4 Analysis Plot     
     20210923 160319    N/A      N/A   N/A     N/A     N/A  40.0  AMSR2  14.1 -142.0   14.1 -142.0   13.9 -142.3 Analysis Plot     
     20210923 193904   -1.7      N/A   N/A   44.44    1.68  40.0 SSMI18  14.3 -141.6   14.3 -141.6   14.6 -141.9 Analysis Plot     
     20210923 195816   -1.7      N/A   N/A   55.55    1.70  40.0 SSMI16  14.3 -141.5   14.3 -141.5   14.4 -141.9 Analysis Plot     
     20210924 164553    N/A      N/A   N/A     N/A     N/A  55.0  AMSR2  16.6 -138.6   16.6 -138.6   16.9 -138.3 Analysis Plot     
     20210924 225152    5.1      N/A  64.4%  33.33    5.09  60.0 SSMI17  17.1 -138.1   16.9 -138.3   16.9 -138.3 Analysis Plot     
     20210925 033942 -930.0      N/A   N/A     N/A    0.00  70.0  AMSR2  17.1 -138.1   17.1 -138.1   16.8 -138.3 Analysis Plot     
     20210925 075706    4.8      N/A  71.2%  33.33    4.78  70.0 SSMI16  17.3 -137.9   17.5 -137.7   17.5 -137.7 Analysis Plot     
     20210925 092542   10.4      N/A  65.8%  33.33   10.41  90.0 SSMI18  17.8 -137.5   17.5 -137.7   17.5 -137.7 Analysis Plot     
     20210925 211302   83.5  >85 kts 100.0%  55.55   68.45 105.0 SSMI16  18.7 -136.9   18.7 -137.0   18.7 -137.0 Analysis Plot     
     20210925 223829   92.6  >85 kts 100.0%  44.44   77.59 105.0 SSMI17  18.8 -136.9   18.6 -136.9   18.6 -136.9 Analysis Plot     
     20210926 023923  104.5  >85 kts 100.0%  44.44   89.48 140.0    GMI  18.7 -136.8   18.7 -136.8   18.7 -136.8 Analysis Plot     
     20210926 042133  102.6  >85 kts 100.0%  44.44   87.64 140.0  AMSR2  18.7 -136.8   18.7 -136.7   18.7 -136.7 Analysis Plot     
     20210926 092252   75.2  >85 kts 100.0%  33.33   60.23 145.0 SSMI16  18.9 -136.6   18.7 -136.7   18.7 -136.7 Analysis Plot     
     20210926 163245   19.1      N/A  20.5%  44.44   19.13 130.0  AMSR2  19.2 -136.6   19.3 -136.8   19.3 -136.8 Analysis Plot     
     20210926 204028   18.8      N/A  38.4% 133.32   18.84 110.0 SSMI18  19.5 -136.6   19.5 -136.6   19.5 -136.6 Analysis Plot     
     20210926 210124   15.2      N/A  42.5% 133.32   15.18 110.0 SSMI16  19.5 -136.6   19.6 -136.7   19.6 -136.7 Analysis Plot     
     20210926 222512    7.6      N/A  37.0% 177.76    7.58 110.0 SSMI17  19.5 -136.6   19.6 -136.6   19.6 -136.6 Analysis Plot     
     20210927 085925   15.7      N/A  28.8% 133.32   15.75  95.0 SSMI16  20.0 -136.5   19.8 -136.5   19.8 -136.5 Analysis Plot     
     20210927 202743   14.2      N/A  39.7% 144.43   14.17  90.0 SSMI18  20.6 -136.3   20.6 -136.3   20.6 -136.3 Analysis Plot     
     20210927 204816   12.7      N/A  34.2% 144.43   12.71  90.0 SSMI16  20.6 -136.2   20.6 -136.4   20.6 -136.4 Analysis Plot     
     20210928 041002   17.1      N/A  53.4% 155.54   17.10  95.0  AMSR2  21.3 -136.1   21.4 -136.0   21.4 -136.0 Analysis Plot     
     20210928 070521   21.0  >65 kts  42.5% 144.43   21.02  95.0 SSMI16  21.4 -136.0   21.6 -135.7   21.6 -135.7 Analysis Plot     
     20210928 083757   42.1  >65 kts 100.0% 166.65   27.06  95.0 SSMI18  21.9 -135.7   21.7 -135.7   21.7 -135.7 Analysis Plot     
     20210928 162023   75.6  >85 kts 100.0% 133.32   60.59 100.0  AMSR2  22.5 -135.3   22.4 -135.6   22.4 -135.6 Analysis Plot     
     20210928 203449   26.5  >65 kts  72.6% 133.32   26.51 100.0 SSMI16  22.8 -135.2   22.9 -135.6   22.9 -135.6 Analysis Plot     
     20210929 170154    6.8      N/A  17.8% 177.76    6.78 115.0  AMSR2  25.8 -135.8   26.1 -135.7   26.1 -135.7 Analysis Plot     
     20210929 232614 -930.0      N/A   N/A     N/A    0.00 110.0 SSMI17  26.6 -136.4   26.5 -136.2   26.5 -136.2 Analysis Plot     
     20210930 114550 -930.0      N/A   N/A     N/A    0.00 100.0 SSMI17  28.6 -137.8   28.6 -137.8   28.8 -137.8 Analysis Plot     
     20210930 160610    5.8      N/A  39.7% 111.10    5.81  80.0  AMSR2  30.1 -139.2   30.0 -138.9   30.0 -138.9 Analysis Plot     
     20211001 062606    2.2      N/A  13.7% 233.31    2.20  80.0 SSMI16  33.6 -142.6   33.6 -142.6   33.3 -142.7 Analysis Plot     
     20211001 073501    1.4      N/A   8.2% 166.65    1.37  80.0 SSMI18  33.8 -142.9   33.8 -142.9   33.3 -142.7 Analysis Plot     
     20211001 164648 -930.0      N/A   N/A     N/A    0.00  65.0  AMSR2  37.5 -146.1   37.5 -146.1   36.9 -146.1 Analysis Plot     
     20211001 193747    1.4      N/A   N/A  233.31    1.37  65.0 SSMI18  38.0 -146.6   38.0 -146.6   37.4 -146.6 Analysis Plot     
     20211001 195555 -930.0      N/A   N/A     N/A    0.00  65.0 SSMI16  38.1 -146.7   38.1 -146.7   37.0 -147.0 Analysis Plot     
     20211001 225926 -930.0      N/A   N/A     N/A    0.00  55.0 SSMI17  38.8 -147.1   38.8 -147.1   38.7 -147.5 Analysis Plot     
     20211002 061302    2.5      N/A   N/A   77.77    2.50  55.0 SSMI16  41.4 -149.7   41.4 -149.7   41.6 -150.6 Analysis Plot     
     20211002 074619    2.0      N/A   N/A   66.66    2.02  55.0 SSMI17  41.9 -150.2   41.9 -150.2   42.2 -151.4 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.