Tropical Storm 13S

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                 
     20240215 230419  SSMISF18  -15.7   65.1   246   24%    2.85   -2.85      N/A   35.0 -15.4   65.3 Analysis Plot     
     20240216 005932  SSMISF16  -16.0   65.4    46   10%    4.70   -4.70      N/A   35.0 -15.5   65.5 Analysis Plot     
     20240216 163946       GMI  -15.8   66.3   N/A   N/A     N/A     N/A      N/A   35.0 -15.8   67.0 Analysis Plot     
     20240216 225119  SSMISF18  -15.6   67.3   N/A   N/A     N/A     N/A      N/A   65.0 -16.2   67.6 Analysis Plot     
     20240217 010956  SSMISF17  -15.7   68.0   N/A   N/A     N/A     N/A      N/A   65.0 -16.2   67.9 Analysis Plot     
     20240217 112527  SSMISF18  -16.3   69.9   112   82%   15.71   15.71      N/A   65.0 -16.5   69.4 Analysis Plot     
     20240217 132047  SSMISF16  -16.3   70.6    68  100%   28.17   43.17  >65 kts   65.0 -16.7   69.9 Analysis Plot     
     20240217 223733  SSMISF18  -17.5   73.4    57  100%   53.32   68.32  >85 kts  100.0 -17.4   74.1 Analysis Plot     
     20240218 003256  SSMISF16  -17.6   74.1    57  100%   45.89   60.89  >85 kts  100.0 -17.7   74.8 Analysis Plot     
     20240218 005537  SSMISF17  -17.7   74.1    57  100%   45.21   60.21  >85 kts  115.0 -17.8   74.9 Analysis Plot     
     20240218 111105  SSMISF18  -19.6   78.3    46  100%   40.36   55.36  >65 kts  120.0 -19.9   78.4 Analysis Plot     
     20240218 130637  SSMISF16  -20.1   79.1    46  100%   39.98   54.98  >65 kts  120.0 -20.2   79.0 Analysis Plot     
     20240218 132831  SSMISF17  -20.2   79.3    46  100%   48.58   63.58  >85 kts  120.0 -20.3   79.1 Analysis Plot     
     20240218 151754       GMI  -21.0   79.6   N/A   N/A     N/A     N/A      N/A  120.0 -20.7   79.7 Analysis Plot     
     20240218 222547  SSMISF18  -23.5   83.2   212   38%    4.54    4.54      N/A  120.0 -23.4   83.5 Analysis Plot     
     20240219 002134  SSMISF16  -24.1   83.8    23   89%    7.41   22.41  >65 kts  105.0 -23.9   84.1 Analysis Plot     
     20240219 004326  SSMISF17  -24.1   84.0   N/A   N/A     N/A     N/A      N/A  105.0 -24.0   84.3 Analysis Plot     
     20240219 131338  SSMISF17  -26.7   88.9   N/A   N/A     N/A     N/A      N/A   90.0 -27.5   89.5 Analysis Plot     
     20240219 143856       GMI  -27.6   89.8   N/A   N/A     N/A     N/A      N/A   75.0 -27.6   89.8 Analysis Plot     
     20240219 222918  SSMISF16  -33.1   94.6   N/A   N/A     N/A     N/A      N/A   55.0 -31.5   95.5 Analysis Plot     
     20240220 002920       GMI  -32.9   95.1   N/A   N/A     N/A     N/A      N/A   55.0 -31.8   96.1 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.