Tropical Depression 12W

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                 
     20230905 165018     AMSR2   24.3  132.3   N/A   N/A     N/A     N/A      N/A   25.0  24.1  133.1 Analysis Plot     
     20230905 202143  SSMISF16   24.4  132.4   N/A   N/A     N/A     N/A      N/A   30.0  24.6  133.6 Analysis Plot     
     20230905 215547  SSMISF17   25.4  132.9   N/A   N/A     N/A     N/A      N/A   30.0  24.8  133.8 Analysis Plot     
     20230906 034850     AMSR2   26.3  134.1   N/A   N/A     N/A     N/A      N/A   35.0  26.6  133.9 Analysis Plot     
     20230906 091300  SSMISF17   27.5  134.8   246    4%    3.15   -3.15      N/A   35.0  27.5  135.1 Analysis Plot     
     20230906 214041  SSMISF17   29.4  136.2   123   N/A    3.00   -3.00      N/A   40.0  29.5  136.3 Analysis Plot     
     20230907 002316       GMI   30.0  136.5   N/A   N/A     N/A     N/A      N/A   40.0  29.7  136.5 Analysis Plot     
     20230907 043157     AMSR2   30.6  137.1   N/A   N/A     N/A     N/A      N/A   40.0  30.6  136.9 Analysis Plot     
     20230907 072652  SSMISF16   31.0  139.1   N/A   N/A     N/A     N/A      N/A   40.0  31.3  137.3 Analysis Plot     
     20230907 100650       GMI   31.6  136.8   N/A   N/A     N/A     N/A      N/A   40.0  31.6  137.3 Analysis Plot     
     20230907 163539     AMSR2   33.4  136.4   N/A   N/A     N/A     N/A      N/A   40.0  32.9  137.1 Analysis Plot     
     20230907 194035  SSMISF18   32.9  136.8   N/A   N/A     N/A     N/A      N/A   40.0  33.1  137.2 Analysis Plot     
     20230907 212602  SSMISF17   32.9  137.0    68   N/A    4.35   -4.35      N/A   40.0  33.4  137.2 Analysis Plot     
     20230907 233029       GMI   34.0  136.8   N/A   N/A     N/A     N/A      N/A   40.0  33.4  137.2 Analysis Plot     
     20230908 033728     AMSR2   32.4  139.2   N/A   N/A     N/A     N/A      N/A   40.0  33.5  137.3 Analysis Plot     
     20230908 091346       GMI   33.0  137.8   N/A   N/A     N/A     N/A      N/A   35.0  32.8  137.7 Analysis Plot     
     20230908 171916     AMSR2   34.6  138.7   N/A   N/A     N/A     N/A      N/A   25.0  34.8  138.5 Analysis Plot     
     20230908 192621  SSMISF18   35.1  138.6   N/A   N/A     N/A     N/A      N/A   25.0  35.1  138.6 Analysis Plot     
     20230908 211206  SSMISF17   35.5  139.1   N/A   N/A     N/A     N/A      N/A   25.0  35.1  138.5 Analysis Plot     
     20230908 211941  SSMISF16   35.6  139.9   N/A   N/A     N/A     N/A      N/A   25.0  35.2  138.5 Analysis Plot     
     20230909 042104     AMSR2   36.0  138.9   N/A   N/A     N/A     N/A      N/A   20.0  36.0  138.8 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.