Tropical Storm 18S

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              
     20210131 202645   -0.3      N/A   N/A  222.20     .30  30.0 SSMI15 -21.4 -119.4  -21.4 -119.4  -21.0 -119.5 Analysis Plot     
     20210201 022329    N/A      N/A   N/A     N/A     N/A  30.0    GMI -20.7 -118.7  -20.7 -118.7  -20.5 -119.0 Analysis Plot     
     20210201 062052 -930.0      N/A   N/A     N/A    0.00  30.0  AMSR2 -20.8 -118.0  -20.8 -118.0  -21.2 -118.8 Analysis Plot     
     20210201 102916    N/A      N/A   N/A     N/A     N/A  30.0 SSMI15 -20.7 -118.6  -20.7 -118.6  -20.9 -118.7 Analysis Plot     
     20210201 171500  -20.5      N/A 100.0%  11.11    5.45  30.0  AMSR2 -21.5 -117.2  -21.5 -117.3  -21.5 -117.3 Analysis Plot     
     20210201 203933   -0.6      N/A   N/A  211.09     .62  30.0 SSMI15 -21.6 -116.9  -21.6 -116.9  -21.8 -116.8 Analysis Plot     
     20210201 214543    N/A      N/A   N/A     N/A     N/A  30.0 SSMI16 -21.7 -116.7  -21.7 -116.7  -21.7 -116.6 Analysis Plot     
     20210202 101105 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI18 -23.2 -115.5  -23.7 -115.4  -23.7 -115.4 Analysis Plot     
     20210202 125410   -7.1      N/A  69.9%  33.33    7.12  30.0    GMI -23.6 -115.2  -23.9 -115.1  -23.9 -115.1 Analysis Plot     
     20210202 175846  -11.3      N/A  82.2%  22.22   11.33  30.0  AMSR2 -24.2 -114.5  -24.2 -114.5  -24.0 -114.4 Analysis Plot     
     20210202 202713 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI15 -24.3 -114.4  -24.3 -114.4  -24.3 -114.8 Analysis Plot     
     20210202 214846    N/A      N/A   N/A     N/A     N/A  30.0 SSMI18 -24.3 -114.4  -24.3 -114.4  -23.8 -114.3 Analysis Plot     
     20210203 021345   -0.3      N/A   N/A  199.98     .26  30.0    GMI -23.7 -114.2  -23.7 -114.2  -23.8 -114.6 Analysis Plot     
     20210203 095822    N/A      N/A   N/A     N/A     N/A  30.0 SSMI18 -23.9 -114.2  -23.9 -114.2  -24.0 -114.4 Analysis Plot     
     20210203 213618   -1.5      N/A   N/A  222.20    1.46  30.0 SSMI18 -23.9 -114.8  -23.9 -114.8  -23.9 -115.1 Analysis Plot     
     20210204 094543    N/A      N/A   N/A     N/A     N/A  35.0 SSMI18 -24.4 -113.6  -24.4 -113.6  -24.8 -114.3 Analysis Plot     
     20210204 174620   -4.4      N/A   N/A  199.98    4.37  35.0  AMSR2 -24.8 -113.2  -24.8 -113.2  -24.3 -113.0 Analysis Plot     
     20210204 210657   -0.8      N/A   N/A  133.32     .82  35.0 SSMI16 -24.9 -113.0  -24.9 -113.0  -24.6 -112.8 Analysis Plot     
     20210204 212318   -0.6      N/A   N/A  222.20     .59  35.0 SSMI18 -24.9 -113.0  -24.9 -113.0  -24.5 -112.8 Analysis Plot     
     20210205 055506    N/A      N/A   N/A     N/A     N/A  35.0  AMSR2 -25.5 -112.1  -25.5 -112.1  -26.5 -113.0 Analysis Plot     
     20210205 091755   -3.7      N/A   N/A   55.55    3.67  35.0 SSMI16 -25.6 -112.1  -25.6 -112.1  -26.4 -112.0 Analysis Plot     
     20210205 093254 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI18 -25.6 -112.1  -25.6 -112.1  -26.7 -112.7 Analysis Plot     
     20210205 110431 -930.0      N/A   N/A     N/A    0.00  35.0 SSMI15 -25.6 -112.1  -25.6 -112.1  -26.6 -112.7 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.