Hurricane 09L

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                 
     20250927 231847       GMI   20.9  -77.8   N/A   N/A     N/A     N/A      N/A   30.0  22.4  -76.6 Analysis Plot     
     20250928 124405       GMI   23.9  -77.0    68   N/A    7.15   -7.15      N/A   30.0  23.4  -77.4 Analysis Plot     
     20250928 223603       GMI   24.4  -77.0   290   15%    4.96   -4.96      N/A   35.0  24.4  -77.3 Analysis Plot     
     20250929 072807     AMSR2   25.6  -78.4   N/A   N/A     N/A     N/A      N/A   40.0  25.5  -77.1 Analysis Plot     
     20250929 120231       GMI   26.5  -76.8   179    7%    3.00   -3.00      N/A   40.0  26.0  -77.1 Analysis Plot     
     20250929 182436     AMSR2   27.6  -77.3    23   33%   10.32   10.32      N/A   55.0  27.6  -77.1 Analysis Plot     
     20250929 215134       GMI   27.2  -78.7   N/A   N/A     N/A     N/A      N/A   55.0  27.9  -77.3 Analysis Plot     
     20250930 063133     AMSR2   28.7  -76.9   N/A   N/A     N/A     N/A      N/A   55.0  28.9  -76.8 Analysis Plot     
     20250930 211418  SSMISF18   29.5  -75.5    46   19%    8.45    8.45      N/A   75.0  29.4  -75.4 Analysis Plot     
     20250930 231839  SSMISF16   29.6  -75.1    46   21%    5.46    5.46      N/A   75.0  29.6  -75.0 Analysis Plot     
     20251001 071435     AMSR2   30.3  -72.6    12    1%    6.43    6.43      N/A   75.0  30.2  -72.1 Analysis Plot     
     20251001 105618  SSMISF17   30.4  -71.8    34  100%   27.83   42.83  >65 kts   75.0  30.5  -70.9 Analysis Plot     
     20251001 181344     AMSR2   31.2  -69.2    23   42%   16.87   16.87      N/A   80.0  31.4  -69.0 Analysis Plot     
     20251002 061712     AMSR2   33.8  -64.2   N/A   N/A     N/A     N/A      N/A   80.0  32.6  -62.4 Analysis Plot     
     20251002 171821     AMSR2   33.2  -57.3   N/A   N/A     N/A     N/A      N/A   70.0  33.5  -58.1 Analysis Plot     
     20251002 194619       GMI   33.6  -56.0   N/A   N/A     N/A     N/A      N/A   70.0  33.8  -57.1 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.