Tropical Storm 21W

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              
     20180815 043542   -2.3      N/A  58.9%  11.11    2.35  30.0  AMSR2  27.6 -127.3   27.6 -127.3   27.7 -127.4 Analysis Plot     
     20180815 132314   -4.2      N/A   N/A   22.22    4.22  30.0    GMI  29.1 -126.2   29.1 -126.2   29.2 -125.8 Analysis Plot     
     20180815 195519 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI15  29.8 -124.9   29.8 -124.9   30.0 -125.2 Analysis Plot     
     20180815 231648   -1.2      N/A   N/A  111.10    1.23  35.0 SSMI17  30.0 -124.5   30.0 -124.5   29.8 -124.3 Analysis Plot     
     20180816 051952   -5.0      N/A   5.5% 199.98    4.98  35.0  AMSR2  30.2 -123.9   30.2 -123.9   30.3 -124.3 Analysis Plot     
     20180816 113636   -4.5      N/A   2.7% 222.20    4.49  40.0 SSMI17  30.3 -123.3   30.3 -123.3   30.3 -123.7 Analysis Plot     
     20180816 172446   -3.8      N/A  19.2% 144.43    3.84  40.0  AMSR2  30.6 -122.0   30.6 -122.0   30.9 -122.0 Analysis Plot     
     20180816 215041 -930.0      N/A   N/A     N/A    0.00  40.0 SSMI15  30.7 -121.8   30.7 -121.8   30.9 -121.4 Analysis Plot     
     20180816 233818 -930.0      N/A   N/A     N/A    0.00  50.0 SSMI18  30.6 -120.6   30.6 -120.6   31.4 -120.2 Analysis Plot     
     20180817 081538    N/A      N/A   N/A     N/A     N/A  45.0 SSMI16  31.7 -119.0   31.7 -119.0   30.8 -118.9 Analysis Plot     
     20180817 100558   -0.9      N/A  19.2% 188.87     .94  45.0 SSMI18  31.8 -118.6   31.8 -118.6   31.0 -118.8 Analysis Plot     
     20180817 131414   -7.1      N/A  17.2%  55.55    7.11  45.0    GMI  32.0 -117.6   32.0 -117.6   31.4 -117.0 Analysis Plot     
     20180817 180706   -1.9      N/A  11.0%  33.33    1.87  45.0  AMSR2  32.3 -116.5   32.3 -116.5   32.0 -116.0 Analysis Plot     
     20180817 213255   -3.7      N/A   N/A   55.55    3.67  45.0 SSMI16  32.5 -116.2   32.5 -116.2   32.2 -115.7 Analysis Plot     
     20180817 232609   -5.4      N/A   N/A   33.33    5.42  45.0 SSMI18  32.7 -115.8   32.7 -115.8   32.5 -115.5 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.