Tropical Storm 04S

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                 
     20241209 231203  SSMISF18  -10.8   61.1   N/A   N/A     N/A     N/A      N/A   40.0 -10.8   61.8 Analysis Plot     
     20241210 013126  SSMISF17  -11.0   60.7    46   36%    4.09   -4.09      N/A   45.0 -10.8   61.5 Analysis Plot     
     20241210 014105  SSMISF16  -11.0   60.8    46   47%    0.16   -0.16      N/A   45.0 -10.8   61.5 Analysis Plot     
     20241210 030604       GMI  -10.5   60.8     5   71%    5.81   -5.81      N/A   45.0 -10.8   61.5 Analysis Plot     
     20241210 114849  SSMISF18  -10.6   60.0    34   47%    8.72   -8.72      N/A   50.0 -10.4   60.1 Analysis Plot     
     20241210 140815  SSMISF17  -10.5   59.8   N/A   N/A     N/A     N/A      N/A   60.0 -10.4   59.9 Analysis Plot     
     20241210 143933       GMI  -10.7   59.9    34   50%   11.85   11.85      N/A   60.0 -10.3   59.8 Analysis Plot     
     20241211 140601  SSMISF16  -10.3   57.1    12  100%   28.63   43.63  >65 kts   95.0 -10.5   57.1 Analysis Plot     
     20241211 211543     AMSR2  -10.4   56.1    12  100%   53.29   68.29  >85 kts  120.0 -10.4   56.0 Analysis Plot     
     20241212 002434  SSMISF18  -10.6   55.6    23  100%   77.40   92.40  >85 kts  125.0 -10.4   55.7 Analysis Plot     
     20241212 031616       GMI  -10.6   54.9    34  100%   78.59   93.59  >85 kts  125.0 -10.4   55.3 Analysis Plot     
     20241212 215751     AMSR2  -10.9   51.4    23  100%   33.05   48.05  >65 kts  135.0 -11.0   51.5 Analysis Plot     
     20241213 001103  SSMISF18  -11.1   50.9    12   93%   16.13   31.13  >65 kts  135.0 -11.1   51.4 Analysis Plot     
     20241213 022951  SSMISF17  -11.0   50.5    68  100%   61.41   76.41  >85 kts  135.0 -11.1   51.0 Analysis Plot     
     20241213 024108  SSMISF16  -11.1   50.5    57  100%   60.92   75.92  >85 kts  135.0 -11.1   50.9 Analysis Plot     
     20241213 151845  SSMISF16  -11.6   48.1    34  100%   67.80   82.80  >85 kts  120.0 -11.7   48.0 Analysis Plot     
     20241213 224155     AMSR2  -11.9   46.7    34  100%   25.28   40.28  >65 kts  110.0 -12.3   46.3 Analysis Plot     
     20241214 032633       GMI  -12.2   45.8    23  100%   27.23   42.23  >65 kts  115.0 -12.2   46.0 Analysis Plot     
     20241214 150541  SSMISF16  -13.0   43.3    23  100%   61.45   76.45  >85 kts  120.0 -13.2   43.4 Analysis Plot     
     20241215 012544  SSMISF18  -13.3   41.3    12  100%   23.96   38.96  >65 kts  115.0 -13.4   40.8 Analysis Plot     
     20241215 035721  SSMISF16  -13.6   40.4   N/A   N/A     N/A     N/A      N/A  115.0 -13.5   40.2 Analysis Plot     
     20241215 141453       GMI  -13.7   37.9    46   29%    8.96    8.96      N/A   60.0 -13.7   38.3 Analysis Plot     
     20241215 162100  SSMISF17  -14.1   37.8   N/A   N/A     N/A     N/A      N/A   60.0 -13.8   37.7 Analysis Plot     
     20241215 223131     AMSR2  -14.6   36.5   N/A   N/A     N/A     N/A      N/A   50.0 -14.5   36.2 Analysis Plot     
     20241216 033613       GMI  -15.3   35.0   N/A   N/A     N/A     N/A      N/A   35.0 -14.9   35.5 Analysis Plot     
     20241216 034303  SSMISF16  -15.1   35.5   157   N/A    1.60   -1.60      N/A   35.0 -14.9   35.4 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.