Tropical Depression 12L

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                 
     20230901 145908     AMSR2   19.7  -28.1   135   N/A    2.93   -2.93      N/A   30.0  19.9  -28.4 Analysis Plot     
     20230901 185352  SSMISF16   20.3  -28.8   N/A   N/A     N/A     N/A      N/A   30.0  20.3  -28.5 Analysis Plot     
     20230901 203130  SSMISF17   20.9  -28.4   157   N/A    3.06   -3.06      N/A   30.0  20.9  -28.7 Analysis Plot     
     20230901 230717       GMI   21.1  -28.4   N/A   N/A     N/A     N/A      N/A   30.0  21.1  -28.8 Analysis Plot     
     20230902 031031     AMSR2   21.6  -28.1   N/A   N/A     N/A     N/A      N/A   30.0  22.0  -28.8 Analysis Plot     
     20230902 053411  SSMISF18   22.1  -28.6   101    3%    0.52   -0.52      N/A   35.0  22.3  -29.0 Analysis Plot     
     20230902 072551  SSMISF16   23.4  -28.8   N/A   N/A     N/A     N/A      N/A   35.0  22.7  -29.4 Analysis Plot     
     20230902 090302  SSMISF17   23.7  -28.9   N/A   N/A     N/A     N/A      N/A   35.0  22.9  -29.5 Analysis Plot     
     20230902 122624       GMI   24.1  -28.2   N/A   N/A     N/A     N/A      N/A   35.0  23.4  -29.8 Analysis Plot     
     20230902 154346     AMSR2   25.1  -29.2   N/A   N/A     N/A     N/A      N/A   45.0  24.1  -29.9 Analysis Plot     
     20230902 184257  SSMISF16   24.4  -30.3   N/A   N/A     N/A     N/A      N/A   45.0  24.4  -30.1 Analysis Plot     
     20230902 221241       GMI   25.2  -30.9   N/A   N/A     N/A     N/A      N/A   50.0  25.2  -30.7 Analysis Plot     
     20230903 035045     AMSR2   26.1  -31.1   N/A   N/A     N/A     N/A      N/A   40.0  26.8  -31.3 Analysis Plot     
     20230903 084755  SSMISF17   26.0  -31.9   N/A   N/A     N/A     N/A      N/A   35.0  26.1  -32.0 Analysis Plot     
     20230903 181819  SSMISF18   26.9  -32.6   179    6%    2.38   -2.38      N/A   35.0  26.9  -32.6 Analysis Plot     
     20230903 200535  SSMISF17   26.9  -32.8   168    4%    1.86   -1.86      N/A   35.0  27.1  -32.8 Analysis Plot     
     20230904 043439     AMSR2   27.6  -33.5   N/A   N/A     N/A     N/A      N/A   30.0  27.2  -33.6 Analysis Plot     
     20230904 064632  SSMISF18   27.3  -33.7   324   N/A    3.90   -3.90      N/A   30.0  27.3  -33.7 Analysis Plot     
     20230904 083413  SSMISF17   27.8  -33.7   268   N/A    3.68   -3.68      N/A   30.0  27.8  -33.7 Analysis Plot     
     20230904 121528       GMI   28.0  -33.9   N/A   N/A     N/A     N/A      N/A   30.0  28.0  -34.0 Analysis Plot     
     20230904 153158     AMSR2   28.0  -34.1   N/A   N/A     N/A     N/A      N/A   30.0  28.0  -34.1 Analysis Plot     
     20230904 180438  SSMISF18   28.1  -34.2   301   N/A    2.54   -2.54      N/A   30.0  28.1  -34.2 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.