Tropical Storm 20S

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                 
     20250223 113852  SSMISF17  -16.8  105.9   N/A   N/A     N/A     N/A      N/A   40.0 -17.3  106.5 Analysis Plot     
     20250223 183522     AMSR2  -18.0  105.3    12   46%    3.69   -3.69      N/A   45.0 -18.0  105.2 Analysis Plot     
     20250223 205012  SSMISF18  -18.4  104.9   N/A   N/A     N/A     N/A      N/A   45.0 -18.2  104.4 Analysis Plot     
     20250223 225045  SSMISF17  -18.4  104.7    68   46%   19.05  -19.05      N/A   50.0 -18.4  104.1 Analysis Plot     
     20250223 233630  SSMISF16  -18.5  104.7    57   43%   14.98  -14.98      N/A   50.0 -18.5  104.1 Analysis Plot     
     20250224 064648     AMSR2  -19.2  103.6    57  100%   27.67   42.67  >65 kts   75.0 -19.2  103.2 Analysis Plot     
     20250224 092338  SSMISF18  -19.3  103.3    46  100%   26.75   41.75  >65 kts   75.0 -19.4  103.2 Analysis Plot     
     20250224 112335  SSMISF17  -19.4  103.2    46  100%   27.65   42.65  >65 kts   75.0 -19.6  103.0 Analysis Plot     
     20250224 132055       GMI  -19.7  103.1    46  100%   33.73   48.73  >65 kts   75.0 -19.8  102.9 Analysis Plot     
     20250224 203727  SSMISF18  -20.8  102.7    34  100%   31.67   46.67  >65 kts   95.0 -20.7  102.6 Analysis Plot     
     20250224 223809  SSMISF17  -21.0  102.5    34   57%   21.46   21.46  >65 kts   95.0 -20.9  102.5 Analysis Plot     
     20250224 232307  SSMISF16  -21.1  102.6    34  100%   37.31   52.31  >65 kts   95.0 -21.0  102.5 Analysis Plot     
     20250225 024525       GMI  -21.5  102.3    34  100%   24.55   39.55  >65 kts  100.0 -21.4  102.3 Analysis Plot     
     20250225 073007     AMSR2  -22.5  102.4   N/A   N/A     N/A     N/A      N/A  100.0 -22.3  102.0 Analysis Plot     
     20250225 090912  SSMISF18  -22.6  102.3   N/A   N/A     N/A     N/A      N/A  100.0 -22.4  102.0 Analysis Plot     
     20250225 110928  SSMISF17  -23.0  102.6   N/A   N/A     N/A     N/A      N/A  100.0 -22.7  101.9 Analysis Plot     
     20250225 115451  SSMISF16  -23.3  102.6   N/A   N/A     N/A     N/A      N/A  100.0 -22.8  101.9 Analysis Plot     
     20250225 202522  SSMISF18  -25.0  103.2   N/A   N/A     N/A     N/A      N/A   90.0 -24.3  102.0 Analysis Plot     
     20250225 231035  SSMISF16  -24.3  102.4   223   14%    2.64    2.64      N/A   90.0 -24.6  102.0 Analysis Plot     
     20250226 085458  SSMISF18  -26.9  103.7   N/A   N/A     N/A     N/A      N/A   45.0 -25.7  102.7 Analysis Plot     
     20250226 114019  SSMISF16  -26.0  103.4   N/A   N/A     N/A     N/A      N/A   45.0 -25.9  102.7 Analysis Plot     
     20250226 201220  SSMISF18  -26.4  103.8   N/A   N/A     N/A     N/A      N/A   35.0 -26.5  103.8 Analysis Plot     
     20250226 225731  SSMISF16  -26.4  103.6   312   N/A    1.51   -1.51      N/A   35.0 -26.4  103.6 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.