Tropical Storm 26W

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                 
     20250923 162335     AMSR2    9.7  134.3    23    3%    5.18   -5.18      N/A   25.0   9.9  133.6 Analysis Plot     
     20250923 212552  SSMISF17    9.5  133.2    23   14%    1.62   -1.62      N/A   30.0   9.5  133.2 Analysis Plot     
     20250923 221137  SSMISF16    9.7  133.2   157   24%    0.29   -0.29      N/A   30.0   9.5  133.1 Analysis Plot     
     20250924 071638  SSMISF18   10.9  131.7   N/A   N/A     N/A     N/A      N/A   45.0   9.9  132.0 Analysis Plot     
     20250924 092118  SSMISF16   10.1  131.5   N/A   N/A     N/A     N/A      N/A   45.0  10.4  130.9 Analysis Plot     
     20250924 170551     AMSR2   10.8  130.2   135   22%    3.39    3.39      N/A   55.0  10.9  129.9 Analysis Plot     
     20250924 231423       GMI   11.2  128.3    68   54%    8.97    8.97      N/A   55.0  11.1  129.2 Analysis Plot     
     20250925 104657       GMI   11.4  126.6   N/A   N/A     N/A     N/A      N/A   55.0  11.8  126.9 Analysis Plot     
     20250925 174938     AMSR2   14.1  123.5   N/A   N/A     N/A     N/A      N/A   55.0  12.7  124.8 Analysis Plot     
     20250926 232350       GMI   14.4  115.3   N/A   N/A     N/A     N/A      N/A   70.0  14.4  115.6 Analysis Plot     
     20250927 105516       GMI   15.5  112.6    34   75%   13.58   13.58      N/A   75.0  15.7  112.5 Analysis Plot     
     20250928 181858     AMSR2   18.3  106.2    23  100%   23.73   38.73  >65 kts   80.0  18.9  104.9 Analysis Plot     
     20250929 065039     AMSR2   19.8  103.1   N/A   N/A     N/A     N/A      N/A   60.0  19.6  103.4 Analysis Plot     
     20250929 110253       GMI   19.7  102.1    34   N/A    9.60    9.60      N/A   60.0  19.9  102.8 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.