Tropical Depression 19W

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                 
     20250822 175950     AMSR2   17.7  118.2   N/A   N/A     N/A     N/A      N/A   30.0  17.1  116.6 Analysis Plot     
     20250822 205247  SSMISF18   17.7  117.7   N/A   N/A     N/A     N/A      N/A   30.0  17.2  116.1 Analysis Plot     
     20250822 221512  SSMISF17   17.9  116.9   N/A   N/A     N/A     N/A      N/A   30.0  17.3  115.7 Analysis Plot     
     20250823 080440  SSMISF18   18.2  115.2   N/A   N/A     N/A     N/A      N/A   50.0  17.6  114.5 Analysis Plot     
     20250823 093708       GMI   18.0  114.3   146   10%    2.92   -2.92      N/A   50.0  17.6  114.3 Analysis Plot     
     20250823 210811       GMI   17.2  111.3   N/A   N/A     N/A     N/A      N/A   60.0  17.3  111.7 Analysis Plot     
     20250824 053643     AMSR2   17.3  110.4    23  100%   28.17   43.17  >65 kts   75.0  17.4  109.9 Analysis Plot     
     20250824 105418  SSMISF17   18.0  109.6    23  100%   46.93   61.93  >85 kts   90.0  17.6  109.4 Analysis Plot     
     20250824 112502  SSMISF16   18.0  109.5    34  100%   57.27   72.27  >85 kts   90.0  17.6  109.3 Analysis Plot     
     20250824 202520       GMI   18.3  107.9    23    1%   16.15   16.15      N/A   90.0  18.2  108.0 Analysis Plot     
     20250825 061904     AMSR2   18.4  106.2    12  100%   32.14   47.14  >65 kts   90.0  18.5  106.1 Analysis Plot     
     20250825 091929  SSMISF18   18.8  105.7     5   N/A    6.96    6.96      N/A   90.0  18.6  105.6 Analysis Plot     
     20250825 094829       GMI   18.4  106.0     5   83%   14.12   14.12      N/A   90.0  18.6  105.5 Analysis Plot     
     20250825 104023  SSMISF17   18.8  105.5    34    7%    4.06    4.06      N/A   90.0  18.7  105.4 Analysis Plot     
     20250825 111151  SSMISF16   18.7  105.4    57   N/A    4.86    4.86      N/A   90.0  18.7  105.3 Analysis Plot     
     20250825 183048     AMSR2   19.0  104.3   N/A   N/A     N/A     N/A      N/A   45.0  18.9  104.2 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.