Tropical Depression 17S

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                 
     20250211 100438  SSMISF16  -18.0  119.2   N/A   N/A     N/A     N/A      N/A   40.0 -17.2  119.8 Analysis Plot     
     20250211 161000       GMI  -18.6  118.6   N/A   N/A     N/A     N/A      N/A   40.0 -18.2  119.1 Analysis Plot     
     20250211 201505  SSMISF18  -19.0  118.7    12  100%   15.91  -30.91      N/A   50.0 -18.7  118.9 Analysis Plot     
     20250212 084850  SSMISF18  -19.2  118.8   N/A   N/A     N/A     N/A      N/A   65.0 -19.1  118.6 Analysis Plot     
     20250212 105100  SSMISF17  -18.8  118.7    34  100%   32.22   47.22  >65 kts   65.0 -19.2  118.5 Analysis Plot     
     20250212 200043  SSMISF18  -19.4  118.3    12  100%   58.97   73.97  >85 kts   85.0 -19.2  118.2 Analysis Plot     
     20250212 220329  SSMISF17  -19.3  118.1    12  100%   41.54   56.54  >65 kts   85.0 -19.2  118.1 Analysis Plot     
     20250212 224434  SSMISF16  -19.2  118.3    12  100%   44.57   59.57  >65 kts   85.0 -19.2  118.1 Analysis Plot     
     20250213 045152       GMI  -19.1  118.2    12  100%   29.80   44.80  >65 kts  120.0 -19.1  118.0 Analysis Plot     
     20250213 052755     AMSR2  -19.1  118.3    12  100%   32.92   47.92  >65 kts  130.0 -19.1  118.0 Analysis Plot     
     20250213 083352  SSMISF18  -19.1  118.2    12   82%   15.13   15.13      N/A  125.0 -19.1  118.2 Analysis Plot     
     20250213 103625  SSMISF17  -19.1  118.3    12   88%   15.68   30.68  >65 kts  125.0 -19.1  118.2 Analysis Plot     
     20250213 180024     AMSR2  -19.4  118.5   N/A   N/A     N/A     N/A      N/A  130.0 -19.6  118.2 Analysis Plot     
     20250213 194655  SSMISF18  -19.5  118.4    12  100%   32.22   47.22  >65 kts  130.0 -19.6  118.2 Analysis Plot     
     20250213 214945  SSMISF17  -19.5  118.4    12   83%   14.59   14.59      N/A  130.0 -19.8  118.2 Analysis Plot     
     20250213 223025  SSMISF16  -19.6  118.6    12   75%   13.64   13.64      N/A  130.0 -19.8  118.2 Analysis Plot     
     20250214 060959     AMSR2  -20.3  119.1    12  100%   53.98   68.98  >85 kts  120.0 -20.2  118.2 Analysis Plot     
     20250214 081922  SSMISF18  -20.7  119.3   N/A   N/A     N/A     N/A      N/A  120.0 -20.4  118.3 Analysis Plot     
     20250214 102153  SSMISF17  -20.9  119.5   N/A   N/A     N/A     N/A      N/A  120.0 -20.5  118.3 Analysis Plot     
     20250214 110313  SSMISF16  -21.2  119.5    12   25%    2.40    2.40      N/A  120.0 -20.6  118.3 Analysis Plot     
     20250214 170440     AMSR2  -22.2  120.2   N/A   N/A     N/A     N/A      N/A   75.0 -21.7  119.2 Analysis Plot     
     20250214 213637  SSMISF17  -23.0  120.6   N/A   N/A     N/A     N/A      N/A   45.0 -22.3  119.2 Analysis Plot     
     20250214 221721  SSMISF16  -24.0  119.0   N/A   N/A     N/A     N/A      N/A   45.0 -22.4  119.2 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.