Tropical Depression 16W

Passive Microwave (PMW) Intensity Information
Advanced Dvorak Technique
Version 9.1


       --Overpass--              --ARCHER--   Ring  Ring            Eye              BT   -Forecast-  
       Date    Time      Sat     Lat    Lon   Diam   Pct  TbDiff   Score  Meaning   Vmax  Lat    Lon                 
     20231017 131614       GMI   16.7  110.4   N/A   N/A     N/A     N/A      N/A   25.0  16.5  109.7 Analysis Plot     
     20231017 210328  SSMISF18   16.9  109.9   101   43%    1.20   -1.20      N/A   30.0  16.9  109.5 Analysis Plot     
     20231017 225636  SSMISF16   16.5  110.3   N/A   N/A     N/A     N/A      N/A   30.0  17.0  109.5 Analysis Plot     
     20231018 060031     AMSR2   17.4  109.3    46   12%    0.09   -0.09      N/A   30.0  17.4  109.3 Analysis Plot     
     20231018 081618  SSMISF18   18.3  108.8   N/A   N/A     N/A     N/A      N/A   35.0  18.5  108.5 Analysis Plot     
     20231018 100844  SSMISF16   18.2  108.8    23   N/A    1.34   -1.34      N/A   35.0  18.5  108.5 Analysis Plot     
     20231018 112629  SSMISF17   18.5  108.9   N/A   N/A     N/A     N/A      N/A   35.0  18.7  108.4 Analysis Plot     
     20231018 181233     AMSR2   18.8  108.7   N/A   N/A     N/A     N/A      N/A   35.0  19.1  108.2 Analysis Plot     
     20231018 204933  SSMISF18   18.9  109.5   N/A   N/A     N/A     N/A      N/A   35.0  19.2  108.2 Analysis Plot     
     20231018 234740       GMI   19.6  109.8   N/A   N/A     N/A     N/A      N/A   35.0  19.3  108.2 Analysis Plot     
     20231019 080402  SSMISF18   20.6  109.2   N/A   N/A     N/A     N/A      N/A   35.0  20.1  108.4 Analysis Plot     
     20231019 095611  SSMISF16   19.5  108.3   N/A   N/A     N/A     N/A      N/A   35.0  20.2  108.4 Analysis Plot     
     20231019 111227  SSMISF17   20.3  108.4   N/A   N/A     N/A     N/A      N/A   35.0  20.3  108.4 Analysis Plot     
     20231019 130523       GMI   20.4  108.4   N/A   N/A     N/A     N/A      N/A   35.0  20.3  108.4 Analysis Plot     
     20231019 185514     AMSR2   21.6  109.5   N/A   N/A     N/A     N/A      N/A   40.0  21.3  109.2 Analysis Plot     
     20231019 203557  SSMISF18   21.9  109.7    34   25%    5.84   -5.84      N/A   40.0  21.3  109.2 Analysis Plot     
     20231019 222819  SSMISF16   22.3  108.5   N/A   N/A     N/A     N/A      N/A   40.0  21.3  109.2 Analysis Plot     
     20231019 234456  SSMISF17   22.5  108.1    12   N/A    0.30   -0.30      N/A   40.0  21.2  109.1 Analysis Plot     
     20231020 054930     AMSR2   20.8  109.6   N/A   N/A     N/A     N/A      N/A   35.0  21.1  109.2 Analysis Plot     
     20231020 075136  SSMISF18   19.7  110.1   N/A   N/A     N/A     N/A      N/A   30.0  20.6  109.6 Analysis Plot     
     20231020 094322  SSMISF16   20.2  109.8   N/A   N/A     N/A     N/A      N/A   30.0  20.5  109.5 Analysis Plot     
     20231020 105835  SSMISF17   20.1  109.5   N/A   N/A     N/A     N/A      N/A   30.0  20.4  109.4 Analysis Plot     
     20231020 175900     AMSR2   20.8  107.8   N/A   N/A     N/A     N/A      N/A   25.0  19.5  108.6 Analysis Plot     
     20231020 202407  SSMISF18   19.4  109.3   N/A   N/A     N/A     N/A      N/A   25.0  19.5  108.4 Analysis Plot     
     20231020 233617       GMI   18.9  109.7   N/A   N/A     N/A     N/A      N/A   25.0  19.4  108.3 Analysis Plot

Legend

  - Overpass Date/Time are determined from satellite overpass of targeted TC (position determined from Best Track Lat/Lon position). Date is YYYYMMDD and time in HHMMSS (UTC).

  - Forecast (Best Track) and ARCHER positions (deg) of the TC center at overpass day/time. Positive/Negative: Latitude = North/South Hemisphere; Longitude = Eastern/Western Hemisphere.

  - BT Vmax is the concurrent ATCF Best Track (BT) wind speed intensity estimate (Vmax) value from either NOAA/National Hurricane Center (NHC) (North Atlantic and Northeast Pacific), NOAA/Central Pacific Hurricane Center (CPHC) (North-central Pacific) or Joint Typhoon Warning Center (JTWC) (Northwest Pacific, Indian Ocean, or Southwest Pacific).

  - Sat is the satellite descriptor providing the overpass. Currently the satellites used are the DMSP/SSMIS-16/17/18, GPM/GMI, and GCOM/AMSR2.

  - Ring Diam (km) indicates the estimated surface eyewall diameter if one is analyzed in the PMW imagery. The value listed is the average PMW-estimated inner eyewall edge diameter minus 10 km for eyewall slope. N/A indicates no appreciable eyewall is analyzed.

  - Ring Pct is the percentage of the analyzed "ring" (eyewall inner boundary) that is 1) colder than the eye Tb (the "hot spot" -- warmest eye pixel) by at least 20K, or 2) that is colder than 232K and colder than the eye Tb by 10K, whichever is greater. Values are red if Ring % ≤65,yellow/brown if Ring % ≤85 and green if Ring % >85. N/A indicates no appreciable eyewall is analyzed. A value over 85% is used in the intensity score by adding 15 points to it.

  - TbDiff is the difference between the warmest eye pixel and the warmest pixel on the eyewall. This value is used in the Intensity Score. N/A indicates no appreciable eyewall is analyzed.

  - Eye Score values are based on the strength and organization of the convective/eyewall signatures in the PMW imagery, and based on the ARCHER center location. They normally range from 0 to 100 with empirically-determined thresholds related to intensity (Vmax) in the "Meaning" column (≥20 suggests ≥65kts; ≥60 suggests ≥85kts). Scores are listed as negative, and not used by the ADT, when the NHC, CPHC, or JTWC Best Track Vmax is <55 kts in order to filter out occasional "false eye" cases. A value of -920 is used when the warmest eye pixel is <200K to prevent false positives; -930 means edge of overpass and <85% of eyewall is captured and therefore can't fully be analyzed.