Tropical Storm 05A

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                 
     20231020 141911  SSMISF17    9.8   60.6    34   24%    0.12   -0.12      N/A   35.0   9.4   60.6 Analysis Plot     
     20231020 151514       GMI    9.1   60.7   N/A   N/A     N/A     N/A      N/A   35.0   9.4   60.5 Analysis Plot     
     20231020 212033     AMSR2    9.7   59.4    12    8%    3.44   -3.44      N/A   40.0  10.0   59.8 Analysis Plot     
     20231021 025752  SSMISF17    9.9   58.8    23   46%    8.10   -8.10      N/A   40.0  10.7   58.5 Analysis Plot     
     20231021 094725     AMSR2   10.4   57.5    12  100%   21.36   36.36  >65 kts   55.0  10.7   57.7 Analysis Plot     
     20231021 140624  SSMISF17   11.1   57.0    12  100%   19.38   34.38  >65 kts   65.0  10.9   57.2 Analysis Plot     
     20231021 220240     AMSR2   11.7   56.0     5   74%    0.41    0.41      N/A  105.0  12.0   56.0 Analysis Plot     
     20231022 012952  SSMISF16   12.1   55.4   N/A   N/A     N/A     N/A      N/A  105.0  12.3   55.5 Analysis Plot     
     20231022 024317  SSMISF17   12.3   55.4    68   97%   19.38   34.38  >65 kts  105.0  12.4   55.4 Analysis Plot     
     20231022 122647  SSMISF18   13.5   54.3    68  100%   44.61   59.61  >65 kts  100.0  13.4   54.2 Analysis Plot     
     20231022 142029  SSMISF16   13.6   54.2    68  100%   53.77   68.77  >85 kts  100.0  13.6   54.0 Analysis Plot     
     20231023 022947       GMI   14.6   53.1    23   10%    7.17    7.17      N/A   95.0  14.5   53.1 Analysis Plot     
     20231023 022954  SSMISF17   14.9   53.1   N/A   N/A     N/A     N/A      N/A   95.0  14.6   53.0 Analysis Plot     
     20231023 093650     AMSR2   15.0   52.6   146   34%    2.21    2.21      N/A   85.0  15.3   52.4 Analysis Plot     
     20231023 121410  SSMISF18   15.4   52.5    68   N/A    5.78    5.78      N/A   85.0  15.4   52.2 Analysis Plot     
     20231023 140649  SSMISF16   15.4   52.4    57    7%   14.36   14.36      N/A   75.0  15.4   52.3 Analysis Plot     
     20231023 154543       GMI   15.5   52.3   N/A   N/A     N/A     N/A      N/A   75.0  15.4   52.2 Analysis Plot     
     20231023 215022     AMSR2   15.6   51.8   N/A   N/A     N/A     N/A      N/A   70.0  15.7   51.7 Analysis Plot     
     20231024 004926  SSMISF18   15.6   52.9    57  100%   12.00   27.00  >65 kts   60.0  15.6   51.8 Analysis Plot     
     20231024 024222  SSMISF16   15.3   51.5   168   23%    1.39    1.39      N/A   60.0  15.6   51.6 Analysis Plot     
     20231024 102006     AMSR2   15.7   51.2     5   N/A    0.09   -0.09      N/A   35.0  15.9   51.2 Analysis Plot     
     20231024 120132  SSMISF18   15.9   51.0   201   N/A    1.61   -1.61      N/A   35.0  15.9   51.1 Analysis Plot     
     20231024 135334  SSMISF16   16.3   50.6    34   N/A    0.65   -0.65      N/A   35.0  15.9   50.9 Analysis Plot     
     20231024 150800  SSMISF17   16.5   50.3     5   N/A    0.71   -0.71      N/A   35.0  16.0   50.8 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.