Tropical Storm 15E

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              
     20210907 201941   -3.1      N/A   6.8%  66.66    3.13  30.0  AMSR2  18.2  107.9   18.2  107.9   18.6  107.3 Analysis Plot     
     20210907 230158 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI18  18.2  107.9   18.2  107.9   18.3  108.3 Analysis Plot     
     20210907 232613   -0.6      N/A   N/A  222.20     .56  30.0 SSMI16  18.2  107.9   18.2  107.9   18.3  108.2 Analysis Plot     
     20210908 004257   -1.6      N/A   1.5% 222.20    1.56  30.0 SSMI18  18.3  108.0   18.3  108.0   18.3  108.3 Analysis Plot     
     20210908 083130   -2.1      N/A  24.7%  55.55    2.14  30.0  AMSR2  18.5  107.1   18.5  107.1   18.5  107.0 Analysis Plot     
     20210908 125245   -1.5      N/A   N/A   88.88    1.47  30.0 SSMI18  18.7  107.2   18.7  107.2   18.4  107.2 Analysis Plot     
     20210908 132148   -1.4      N/A   N/A   66.66    1.42  30.0 SSMI16  18.7  107.3   18.7  107.3   18.4  107.1 Analysis Plot     
     20210908 144937   -1.3      N/A   N/A   44.44    1.33  35.0 SSMI17  18.8  107.4   18.8  107.4   19.0  107.3 Analysis Plot     
     20210908 231303   -4.5      N/A  41.1%  66.66    4.54  40.0 SSMI16  19.5  107.8   19.5  107.8   19.6  107.3 Analysis Plot     
     20210909 002959   -3.4      N/A  47.9%  66.66    3.35  40.0 SSMI18  19.6  107.9   19.6  107.9   19.5  107.4 Analysis Plot     
     20210909 091335    N/A      N/A   N/A     N/A     N/A  55.0  AMSR2  20.6  108.0   20.6  108.0   20.1  106.9 Analysis Plot     
     20210909 124000   52.2  >65 kts 100.0%  77.77   37.24  55.0 SSMI18  20.8  108.2   20.8  108.2   21.1  107.9 Analysis Plot     
     20210909 130850   56.1  >65 kts 100.0%  77.77   41.15  55.0 SSMI16  20.8  108.2   20.8  108.2   21.1  107.8 Analysis Plot     
     20210909 200907   24.4  >65 kts  57.5%  66.66   24.40  75.0  AMSR2  22.0  108.8   22.3  108.8   22.3  108.8 Analysis Plot     
     20210910 155602 -930.0      N/A   N/A     N/A    0.00  65.0 SSMI17  24.1  111.3   24.1  111.3   24.4  112.0 Analysis Plot     
     20210910 205159   -3.8      N/A   N/A  155.54    3.76  45.0  AMSR2  24.6  112.6   24.6  112.6   24.6  112.8 Analysis Plot     
     20210911 001330   -1.4      N/A   N/A  155.54    1.45  45.0 SSMI18  24.7  113.0   24.7  113.0   24.4  113.3 Analysis Plot     
     20210911 020302 -930.0      N/A   N/A     N/A    0.00  45.0 SSMI16  24.7  113.2   24.7  113.2   24.4  113.2 Analysis Plot     
     20210911 033923   -1.3      N/A   N/A  199.98    1.30  35.0 SSMI17  24.7  113.3   24.7  113.3   24.5  113.2 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.