Tropical Depression 18E

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              
     20180908 220718   -2.5      N/A   6.8% 122.21    2.46  30.0    GMI  15.9  116.9   15.9  116.9   15.3  116.8 Analysis Plot     
     20180909 013317 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI18  15.9  117.0   15.9  117.0   16.2  117.0 Analysis Plot     
     20180909 022201   -1.9      N/A   N/A  122.21    1.86  30.0 SSMI17  16.0  117.1   16.0  117.1   16.3  117.1 Analysis Plot     
     20180909 040112   -2.1      N/A   N/A  111.10    2.10  30.0 SSMI17  16.1  117.2   16.1  117.2   16.3  117.1 Analysis Plot     
     20180909 100411 -930.0      N/A   N/A     N/A    0.00  35.0  AMSR2  17.3  117.6   17.3  117.6   17.8  117.9 Analysis Plot     
     20180909 110104   -4.4      N/A   N/A  211.09    4.41  35.0 SSMI15  17.4  117.7   17.4  117.7   17.7  117.7 Analysis Plot     
     20180909 131127   -2.4      N/A   8.2% 188.87    2.38  35.0 SSMI16  17.5  117.7   17.5  117.7   17.9  117.8 Analysis Plot     
     20180909 151627   -3.0      N/A   9.6% 222.20    2.98  35.0 SSMI18  17.9  118.1   17.9  118.1   18.3  118.2 Analysis Plot     
     20180909 160423   -2.4      N/A   9.6% 199.98    2.44  35.0 SSMI17  17.9  118.1   17.9  118.1   18.2  118.3 Analysis Plot     
     20180910 030113   -1.9      N/A   1.4% 222.20    1.91  40.0 SSMI18  19.3  119.3   19.3  119.3   19.1  119.0 Analysis Plot     
     20180910 083931   -1.9      N/A  11.0% 188.87    1.88  35.0    GMI  20.1  119.9   20.1  119.9   20.4  120.1 Analysis Plot     
     20180910 125816   -1.3      N/A   6.8% 222.20    1.30  35.0 SSMI16  20.4  120.2   20.4  120.2   20.4  119.9 Analysis Plot     
     20180910 150431   -1.6      N/A   4.1% 222.20    1.62  35.0 SSMI18  20.7  120.6   20.7  120.6   20.9  120.2 Analysis Plot     
     20180910 155128   -3.2      N/A   2.7% 222.20    3.17  35.0 SSMI17  20.8  120.7   20.8  120.7   20.8  120.3 Analysis Plot     
     20180910 215805   -3.1      N/A   N/A  222.20    3.10  35.0    GMI  21.4  121.3   21.4  121.3   21.6  121.4 Analysis Plot     
     20180911 020903   -1.0      N/A   N/A   66.66    1.05  35.0 SSMI17  21.5  121.7   21.5  121.7   21.7  121.6 Analysis Plot     
     20180911 025029   -0.4      N/A   N/A   55.55     .41  35.0 SSMI18  21.5  121.8   21.5  121.8   21.6  121.7 Analysis Plot     
     20180911 094933   -2.8      N/A   1.4% 222.20    2.85  30.0  AMSR2  22.0  123.3   22.0  123.3   22.2  123.5 Analysis Plot     
     20180912 002817   -1.7      N/A   N/A  155.54    1.73  30.0 SSMI16  22.4  125.6   22.4  125.6   22.5  125.9 Analysis Plot     
     20180912 082810   -2.5      N/A   N/A  111.10    2.51  30.0    GMI  22.3  127.3   22.3  127.3   22.8  127.8 Analysis Plot     
     20180912 142041   -0.6      N/A   N/A   11.11     .63  30.0 SSMI16  22.4  128.1   22.4  128.1   23.5  128.1 Analysis Plot     
     20180912 170331   -0.9      N/A   N/A   55.55     .89  30.0 SSMI17  22.4  128.4   22.4  128.4   23.3  129.1 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.