Tropical Depression 03A

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              
     20210930 210427   -6.7      N/A  45.2% 177.76    6.74  40.0  AMSR2  22.8  -64.9   22.7  -65.3   22.7  -65.3 Analysis Plot     
     20211001 145151   12.8      N/A  35.6%  55.55   12.76  60.0 SSMI17  23.4  -63.4   23.4  -63.4   23.6  -63.7 Analysis Plot     
     20211002 034543    8.0      N/A   6.8%  44.44    7.98  65.0 SSMI17  24.0  -62.1   24.0  -62.1   24.1  -62.1 Analysis Plot     
     20211002 084408   54.2  >65 kts 100.0%  33.33   39.17  60.0  AMSR2  24.2  -61.3   24.4  -61.2   24.4  -61.2 Analysis Plot     
     20211002 131315   36.4  >65 kts 100.0%  33.33   21.37  60.0 SSMI16  24.4  -60.8   24.4  -60.8   24.3  -60.3 Analysis Plot     
     20211002 143134    3.7      N/A  17.8%  55.55    3.67  65.0 SSMI17  24.6  -60.5   24.6  -60.5   24.3  -60.4 Analysis Plot     
     20211003 020518    4.3      N/A   N/A   22.22    4.26  65.0 SSMI18  24.3  -59.3   24.3  -59.3   24.2  -58.9 Analysis Plot     
     20211003 023122    2.9      N/A   N/A   33.33    2.92  65.0 SSMI16  24.3  -59.2   24.3  -59.2   24.3  -59.0 Analysis Plot     
     20211003 035851    4.7      N/A   N/A   22.22    4.70  65.0 SSMI17  24.3  -59.0   24.3  -59.0   24.2  -58.9 Analysis Plot     
     20211003 092558    9.8      N/A  35.6%  22.22    9.82  70.0  AMSR2  24.0  -58.3   24.0  -58.3   24.1  -58.3 Analysis Plot     
     20211003 123730   12.4      N/A  23.3%  44.44   12.40  70.0 SSMI18  23.9  -58.0   23.9  -58.0   23.9  -58.0 Analysis Plot     
     20211003 125612   16.2      N/A  19.2%  44.44   16.21  70.0 SSMI16  23.9  -58.0   23.9  -58.0   23.8  -58.0 Analysis Plot     
     20211003 141810    6.5      N/A   N/A  166.65    6.47  65.0 SSMI17  23.9  -58.0   23.9  -58.0   24.4  -58.0 Analysis Plot     
     20211003 213519   18.5      N/A 100.0%  33.33    3.51  55.0  AMSR2  23.5  -57.0   23.5  -57.0   23.8  -56.9 Analysis Plot     
     20211004 015311 -930.0      N/A   N/A     N/A    0.00  55.0 SSMI18  23.3  -56.7   23.3  -56.7   22.7  -57.3 Analysis Plot     
     20211004 021718 -930.0      N/A   N/A     N/A    0.00  55.0 SSMI16  23.3  -56.7   23.3  -56.7   22.7  -57.3 Analysis Plot     
     20211004 034450 -930.0      N/A   N/A     N/A    0.00  55.0 SSMI17  23.2  -56.6   23.2  -56.6   22.6  -57.4 Analysis Plot     
     20211004 122915 -930.0      N/A   N/A     N/A    0.00  55.0 SSMI18  22.6  -55.8   22.6  -55.8   21.2  -55.6 Analysis Plot     
     20211004 124557 -930.0      N/A   N/A     N/A    0.00  55.0 SSMI16  22.6  -55.8   22.6  -55.8   21.2  -55.5 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.