Tropical Storm 18L

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              
     20191026 015453   -6.9      N/A   N/A   22.22    6.93  40.0    GMI  35.5   31.5   35.5   31.5   35.4   31.5 Analysis Plot     
     20191026 034816  -15.4      N/A  17.8%  11.11   15.35  40.0  AMSR2  35.5   30.8   35.5   30.8   35.2   31.1 Analysis Plot     
     20191026 075012   -1.5      N/A   N/A   11.11    1.51  40.0 SSMI16  35.4   30.2   35.4   30.2   35.2   30.6 Analysis Plot     
     20191026 081245   -3.8      N/A  27.4%  22.22    3.83  40.0 SSMI18  35.3   30.6   35.3   30.6   35.2   30.2 Analysis Plot     
     20191026 145039  -31.4      N/A  91.8%  22.22   16.39  45.0  AMSR2  35.1   28.4   35.1   28.4   35.2   28.0 Analysis Plot     
     20191026 175430   -3.7      N/A   N/A   11.11    3.75  45.0 SSMI16  35.5   27.4   35.5   27.4   35.5   26.8 Analysis Plot     
     20191026 183952   -2.2      N/A   N/A   11.11    2.24  45.0 SSMI18  35.7   27.2   35.7   27.2   35.6   26.3 Analysis Plot     
     20191027 010300  -34.7      N/A  94.5%  22.22   19.69  50.0    GMI  37.5   24.2   37.5   24.2   37.7   23.1 Analysis Plot     
     20191027 025312   46.6  >65 kts 100.0%  22.22   31.57  55.0  AMSR2  38.4   22.4   38.4   22.4   38.3   22.3 Analysis Plot     
     20191027 074933    5.1      N/A  15.1%  22.22    5.14  55.0 SSMI16  39.4   21.4   39.4   21.4   39.7   20.8 Analysis Plot     
     20191027 074945   10.8      N/A  61.6%  22.22   10.83  55.0 SSMI18  39.6   21.3   39.6   21.3   40.0   20.4 Analysis Plot     
     20191027 135716   43.4  >65 kts 100.0%  22.22   28.41  60.0  AMSR2  42.3   18.7   42.3   18.7   42.5   18.2 Analysis Plot     
     20191027 160731 -930.0      N/A   N/A     N/A    0.00  60.0    GMI  43.2   18.1   43.4   17.8   43.4   17.8 Analysis Plot     
     20191027 182723    8.1      N/A  45.2%  22.22    8.13  60.0 SSMI18  43.6   17.9   43.6   17.9   44.0   17.4 Analysis Plot     
     20191028 033243    1.9      N/A   N/A   22.22    1.88  60.0  AMSR2  46.2   17.1   46.2   17.1   46.3   17.2 Analysis Plot     
     20191028 072355    4.8      N/A   N/A   99.99    4.77  60.0 SSMI16  46.4   17.1   46.4   17.1   46.5   17.6 Analysis Plot     
     20191028 080922    4.1      N/A   N/A   99.99    4.09  60.0 SSMI18  46.5   17.1   46.5   17.1   46.5   17.6 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.