Tropical Storm 31Y_04

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              
     20211007 232039 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI17  13.1 -128.7   13.1 -128.7   12.9 -129.2 Analysis Plot     
     20211008 082905   -0.4      N/A   1.4% 299.97     .39  30.0 SSMI16  14.1 -131.1   14.1 -131.1   13.8 -130.9 Analysis Plot     
     20211008 095252 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI18  14.0 -131.1   14.0 -131.1   13.8 -130.7 Analysis Plot     
     20211008 231649   -0.8      N/A   N/A  222.20     .82  35.0 SSMI17  13.8 -131.6   13.8 -131.6   13.7 -131.6 Analysis Plot     
     20211009 081624   -1.1      N/A   1.5% 266.64    1.07  45.0 SSMI16  14.1 -131.4   14.1 -131.4   14.5 -131.1 Analysis Plot     
     20211009 094003 -930.0      N/A   N/A     N/A    0.00  45.0 SSMI18  14.1 -131.6   14.1 -131.6   14.6 -131.0 Analysis Plot     
     20211009 112837    N/A      N/A   N/A     N/A     N/A  45.0 SSMI17  14.2 -131.6   14.2 -131.6   14.2 -131.4 Analysis Plot     
     20211009 213152   -1.2      N/A   5.5% 244.42    1.16  45.0 SSMI16  14.6 -130.2   14.6 -130.2   14.8 -129.7 Analysis Plot     
     20211009 225322 -930.0      N/A   N/A     N/A    0.00  45.0 SSMI17  14.6 -130.1   14.6 -130.1   15.5 -130.0 Analysis Plot     
     20211010 075956 -930.0      N/A   N/A     N/A    0.00  45.0 SSMI16  16.4 -128.5   16.4 -128.5   16.8 -128.1 Analysis Plot     
     20211010 092716 -930.0      N/A   N/A     N/A    0.00  45.0 SSMI18  16.4 -128.5   16.4 -128.5   16.7 -128.0 Analysis Plot     
     20211010 210403 -930.0      N/A   N/A     N/A    0.00  45.0 SSMI18  18.1 -125.4   18.1 -125.4   19.0 -125.4 Analysis Plot     
     20211010 212057    N/A      N/A   N/A     N/A     N/A  45.0 SSMI16  18.1 -125.4   18.1 -125.4   18.2 -124.6 Analysis Plot     
     20211011 105954    N/A      N/A   N/A     N/A     N/A  50.0 SSMI17  18.8 -123.3   18.8 -123.3   18.5 -122.6 Analysis Plot     
     20211012 091715 -930.0      N/A   N/A     N/A    0.00  55.0 SSMI16  18.6 -117.1   18.6 -117.1   19.3 -117.0 Analysis Plot     
     20211012 181203    N/A      N/A   N/A     N/A     N/A  55.0  AMSR2  18.3 -114.4   18.3 -114.4   19.2 -113.7 Analysis Plot     
     20211012 223438    2.2      N/A  38.4% 133.32    2.18  55.0 SSMI16  18.4 -113.9   18.4 -113.9   19.1 -113.0 Analysis Plot     
     20211013 084858    6.1      N/A   N/A   88.88    6.08  55.0 SSMI18  18.4 -110.8   18.4 -110.8   18.6 -110.5 Analysis Plot     
     20211013 090643    5.3      N/A   N/A  133.32    5.35  55.0 SSMI16  18.4 -110.7   18.4 -110.7   18.6 -110.7 Analysis Plot     
     20211013 185543 -930.0      N/A   N/A     N/A    0.00  50.0  AMSR2  18.6 -108.1   18.6 -108.1   19.7 -107.9 Analysis Plot     
     20211013 222038   -1.2      N/A   N/A   44.44    1.15  50.0 SSMI16  18.8 -108.1   18.8 -108.1   19.0 -109.0 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.