Tropical Depression 13E

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                 
     20250911 201245     AMSR2   15.6  -98.6    68   33%    4.83   -4.83      N/A   30.0  15.5  -98.9 Analysis Plot     
     20250911 221540  SSMISF18   14.9  -98.2   N/A   N/A     N/A     N/A      N/A   30.0  15.6  -99.1 Analysis Plot     
     20250912 082522     AMSR2   16.5 -101.0    23   N/A    5.27   -5.27      N/A   30.0  16.6 -101.1 Analysis Plot     
     20250912 105005  SSMISF18   18.3 -100.8   N/A   N/A     N/A     N/A      N/A   30.0  16.7 -101.5 Analysis Plot     
     20250913 010221  SSMISF17   16.7 -103.2    79    3%    0.59   -0.59      N/A   35.0  17.5 -103.6 Analysis Plot     
     20250913 014245  SSMISF16   16.5 -103.9   N/A   N/A     N/A     N/A      N/A   35.0  17.6 -103.7 Analysis Plot     
     20250913 050655       GMI   18.3 -105.6   146   11%    7.57   -7.57      N/A   35.0  18.2 -105.0 Analysis Plot     
     20250913 090818     AMSR2   18.9 -106.4   N/A   N/A     N/A     N/A      N/A   30.0  18.6 -106.0 Analysis Plot     
     20250914 140243  SSMISF16   18.6 -110.2    79   35%    0.73   -0.73      N/A   35.0  18.5 -110.2 Analysis Plot     
     20250914 204427     AMSR2   19.6 -110.1   N/A   N/A     N/A     N/A      N/A   40.0  18.9 -110.8 Analysis Plot     
     20250914 231541  SSMISF18   18.4 -110.9   179   N/A    2.73   -2.73      N/A   40.0  19.1 -111.0 Analysis Plot     
     20250914 231542  SSMISF18   18.4 -110.9   N/A   N/A     N/A     N/A      N/A   40.0  19.2 -111.2 Analysis Plot     
     20250915 051710       GMI   19.4 -111.6   N/A   N/A     N/A     N/A      N/A   40.0  19.3 -111.8 Analysis Plot     
     20250915 085559     AMSR2   19.6 -112.6   N/A   N/A     N/A     N/A      N/A   45.0  19.5 -112.6 Analysis Plot     
     20250915 114823  SSMISF18   19.9 -113.4    46   74%    7.28   -7.28      N/A   45.0  19.7 -112.9 Analysis Plot     
     20250915 184051       GMI   20.8 -114.1    57   44%    6.31   -6.31      N/A   50.0  20.4 -113.8 Analysis Plot     
     20250915 212931     AMSR2   21.4 -115.6   N/A   N/A     N/A     N/A      N/A   55.0  20.9 -114.6 Analysis Plot     
     20250915 230305  SSMISF18   21.1 -114.7   N/A   N/A     N/A     N/A      N/A   55.0  21.1 -114.8 Analysis Plot     
     20250916 020313  SSMISF17   21.3 -114.8   N/A   N/A     N/A     N/A      N/A   50.0  21.5 -115.3 Analysis Plot     
     20250916 093755     AMSR2   22.0 -116.2   123   26%    0.72   -0.72      N/A   45.0  22.1 -115.9 Analysis Plot     
     20250916 113435  SSMISF18   22.1 -116.7   123   17%    7.18   -7.18      N/A   45.0  22.3 -116.2 Analysis Plot     
     20250916 143337  SSMISF17   22.4 -117.0    34   N/A    2.57   -2.57      N/A   40.0  22.8 -117.4 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.