Tropical Storm 08L

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                 
     20250924 221814       GMI   20.3  -55.3   135   15%    2.44   -2.44      N/A   35.0  20.3  -55.1 Analysis Plot     
     20250925 114247       GMI   20.7  -56.8   168    6%    3.11   -3.11      N/A   40.0  21.4  -56.6 Analysis Plot     
     20250925 170841     AMSR2   21.5  -56.4    23   62%   12.30  -12.30      N/A   40.0  21.5  -56.9 Analysis Plot     
     20250926 051838     AMSR2   22.0  -57.0    46   97%   18.76   33.76  >65 kts   55.0  22.3  -57.3 Analysis Plot     
     20250927 115221       GMI   22.6  -59.8   N/A   N/A     N/A     N/A      N/A  125.0  22.4  -59.7 Analysis Plot     
     20250927 214449       GMI   23.0  -61.2    12  100%   67.59   82.59  >85 kts  135.0  23.0  -61.2 Analysis Plot     
     20250928 174054     AMSR2   25.0  -64.8    90  100%   40.84   55.84  >65 kts  125.0  26.0  -66.0 Analysis Plot     
     20250929 054901     AMSR2   26.6  -66.6    68  100%   37.21   52.21  >65 kts  115.0  26.9  -66.8 Analysis Plot     
     20250929 120316       GMI   27.6  -67.2   N/A   N/A     N/A     N/A      N/A  115.0  27.8  -67.3 Analysis Plot     
     20250929 215253       GMI   29.2  -68.6   N/A   N/A     N/A     N/A      N/A  120.0  29.3  -68.2 Analysis Plot     
     20250930 062954     AMSR2   30.8  -69.6   N/A   N/A     N/A     N/A      N/A   90.0  31.2  -68.7 Analysis Plot     
     20250930 112147       GMI   32.1  -69.7   N/A   N/A     N/A     N/A      N/A   90.0  32.1  -69.5 Analysis Plot     
     20250930 173113     AMSR2   33.2  -69.7   N/A   N/A     N/A     N/A      N/A   70.0  33.8  -69.8 Analysis Plot     
     20250930 210915       GMI   33.8  -69.5   N/A   N/A     N/A     N/A      N/A   70.0  34.0  -69.5 Analysis Plot     
     20250930 232014  SSMISF16   34.3  -68.7   212   15%    5.23    5.23      N/A   70.0  34.4  -69.2 Analysis Plot     
     20251001 105428  SSMISF17   36.0  -66.0   190   N/A    6.27    6.27      N/A   70.0  36.2  -66.2 Analysis Plot     
     20251001 163804     AMSR2   37.4  -61.2    23    8%    0.32    0.32      N/A   60.0  37.3  -61.8 Analysis Plot     
     20251001 202642       GMI   36.8  -60.1   N/A   N/A     N/A     N/A      N/A   60.0  37.3  -60.7 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.