Tropical Depression 17E

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                 
     20251009 123029  SSMISF17   17.6 -100.5   N/A   N/A     N/A     N/A      N/A   40.0  16.5 -101.7 Analysis Plot     
     20251009 211513       GMI   18.1 -100.7   N/A   N/A     N/A     N/A      N/A   40.0  16.5 -101.8 Analysis Plot     
     20251009 222634  SSMISF18   16.1 -101.1    68   N/A    0.26   -0.26      N/A   40.0  16.6 -102.0 Analysis Plot     
     20251010 103812       GMI   17.7 -104.1   N/A   N/A     N/A     N/A      N/A   50.0  17.6 -103.7 Analysis Plot     
     20251010 110026  SSMISF18   17.6 -104.3    79   17%    0.96   -0.96      N/A   50.0  17.9 -104.2 Analysis Plot     
     20251011 010852  SSMISF17   19.9 -107.4    34   N/A    1.92   -1.92      N/A   45.0  19.8 -107.4 Analysis Plot     
     20251011 020314  SSMISF16   20.2 -107.8   N/A   N/A     N/A     N/A      N/A   45.0  20.4 -107.9 Analysis Plot     
     20251011 093233     AMSR2   21.8 -109.9   101   N/A    0.31   -0.31      N/A   40.0  21.3 -109.7 Analysis Plot     
     20251011 134041  SSMISF17   21.5 -109.2     5   N/A    0.17   -0.17      N/A   35.0  21.5 -109.2 Analysis Plot     
     20251011 143509  SSMISF16   21.6 -109.3   N/A   N/A     N/A     N/A      N/A   35.0  21.6 -109.3 Analysis Plot     
     20251011 202658     AMSR2   22.2 -109.9   N/A   N/A     N/A     N/A      N/A   30.0  22.5 -109.9 Analysis Plot     
     20251011 212441       GMI   22.2 -110.3   N/A   N/A     N/A     N/A      N/A   30.0  22.6 -109.9 Analysis Plot     
     20251011 234240  SSMISF18   24.0 -110.4   N/A   N/A     N/A     N/A      N/A   30.0  23.1 -110.2 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.