Tropical Storm 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                 
     20240924 121459  SSMISF16   19.4  -84.2   146   N/A    1.38   -1.38      N/A   40.0  19.4  -83.7 Analysis Plot     
     20240924 211203  SSMISF18   19.4  -85.0   168   29%    1.92   -1.92      N/A   40.0  19.8  -84.7 Analysis Plot     
     20240924 230641       GMI   19.6  -84.7    90   18%    0.10   -0.10      N/A   40.0  19.9  -84.8 Analysis Plot     
     20240924 232833  SSMISF16   19.8  -84.8    68   18%    0.48   -0.48      N/A   40.0  20.0  -84.9 Analysis Plot     
     20240924 235336  SSMISF17   19.9  -84.5    68   17%    0.30   -0.30      N/A   50.0  20.0  -85.0 Analysis Plot     
     20240925 094432  SSMISF18   20.9  -85.8    79   54%   14.15   14.15      N/A   55.0  21.0  -86.4 Analysis Plot     
     20240925 120051  SSMISF16   21.1  -86.2    34   22%    5.56    5.56      N/A   60.0  21.3  -86.5 Analysis Plot     
     20240925 122534  SSMISF17   21.1  -86.1    46   22%    2.41    2.41      N/A   60.0  21.4  -86.5 Analysis Plot     
     20240925 205956  SSMISF18   22.3  -86.9   101   21%   12.03   12.03      N/A   75.0  22.5  -86.6 Analysis Plot     
     20240925 210004  SSMISF18   22.3  -87.0   101   24%   12.71   12.71      N/A   75.0  22.8  -86.7 Analysis Plot     
     20240925 231630  SSMISF16   22.9  -86.7    23   N/A    7.45    7.45      N/A   75.0  22.9  -86.7 Analysis Plot     
     20240925 234028  SSMISF17   22.8  -86.5    90   N/A    5.81    5.81      N/A   75.0  23.0  -86.7 Analysis Plot     
     20240926 095310       GMI   24.4  -86.1   N/A   N/A     N/A     N/A      N/A   75.0  24.4  -86.1 Analysis Plot     
     20240926 114642  SSMISF16   24.6  -85.7    57   56%   13.00   13.00      N/A   85.0  25.2  -85.8 Analysis Plot     
     20240926 121025  SSMISF17   24.6  -85.7    57   58%   19.50   19.50      N/A   85.0  25.3  -85.7 Analysis Plot     
     20240926 232017       GMI   28.5  -84.1    46   79%   21.84   21.84  >65 kts  105.0  28.9  -84.3 Analysis Plot     
     20240927 091446  SSMISF18   32.9  -83.4   N/A   N/A     N/A     N/A      N/A   80.0  33.8  -82.9 Analysis Plot     
     20240927 113112  SSMISF16   34.0  -83.1   N/A   N/A     N/A     N/A      N/A   45.0  34.6  -83.1 Analysis Plot     
     20240927 115357  SSMISF17   34.1  -83.2   N/A   N/A     N/A     N/A      N/A   45.0  34.8  -83.1 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.