Tropical Depression 13W

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                 
     20250802 061732  SSMISF18   29.0  138.2    68   N/A    0.71   -0.71      N/A   30.0  29.0  138.2 Analysis Plot     
     20250802 164148     AMSR2   30.1  141.9   N/A   N/A     N/A     N/A      N/A   30.0  31.3  140.8 Analysis Plot     
     20250802 184404  SSMISF18   31.5  141.0   223   N/A    1.40   -1.40      N/A   35.0  31.5  141.0 Analysis Plot     
     20250803 034244     AMSR2   34.1  143.3   N/A   N/A     N/A     N/A      N/A   35.0  34.4  143.3 Analysis Plot     
     20250803 060445  SSMISF18   34.6  143.6   146    4%    1.97   -1.97      N/A   35.0  34.6  143.5 Analysis Plot     
     20250803 142256       GMI   35.9  146.2   N/A   N/A     N/A     N/A      N/A   35.0  36.1  146.2 Analysis Plot     
     20250803 154510     AMSR2   36.2  148.1   N/A   N/A     N/A     N/A      N/A   35.0  36.8  147.9 Analysis Plot     
     20250803 182813  SSMISF18   36.7  147.8    57   N/A    0.19   -0.19      N/A   35.0  36.8  148.1 Analysis Plot     
     20250804 024817     AMSR2   37.3  151.3   N/A   N/A     N/A     N/A      N/A   35.0  37.4  151.3 Analysis Plot     
     20250804 071702  SSMISF17   37.4  151.9   279   N/A    1.55   -1.55      N/A   30.0  37.5  152.1 Analysis Plot     
     20250804 073843  SSMISF16   37.3  151.9   N/A   N/A     N/A     N/A      N/A   30.0  37.5  152.3 Analysis Plot     
     20250804 134128       GMI   37.5  154.0   N/A   N/A     N/A     N/A      N/A   30.0  37.5  154.1 Analysis Plot     
     20250805 015442     AMSR2   38.3  159.8   N/A   N/A     N/A     N/A      N/A   30.0  38.6  158.2 Analysis Plot     
     20250805 053853  SSMISF18   38.5  158.6   N/A   N/A     N/A     N/A      N/A   30.0  38.7  158.4 Analysis Plot     
     20250805 072442  SSMISF16   38.8  158.9    12   N/A    1.78   -1.78      N/A   30.0  38.9  158.8 Analysis Plot     
     20250805 125944       GMI   39.1  159.2   N/A   N/A     N/A     N/A      N/A   30.0  39.4  160.4 Analysis Plot     
     20250805 153121     AMSR2   39.3  160.1   N/A   N/A     N/A     N/A      N/A   30.0  40.1  161.3 Analysis Plot     
     20250805 192435  SSMISF17   40.0  161.3    57   N/A    1.42   -1.42      N/A   30.0  40.4  161.8 Analysis Plot     
     20250805 192446  SSMISF17   40.0  161.1   268   N/A    1.42   -1.42      N/A   25.0  40.2  161.3 Analysis Plot     
     20250806 023655     AMSR2   40.9  163.5   N/A   N/A     N/A     N/A      N/A   25.0  40.9  163.5 Analysis Plot     
     20250806 071129  SSMISF16   41.5  164.7   N/A   N/A     N/A     N/A      N/A   25.0  41.5  164.7 Analysis Plot     
     20250806 121813       GMI   42.4  166.6   N/A   N/A     N/A     N/A      N/A   25.0  42.3  166.5 Analysis Plot     
     20250806 143517     AMSR2   42.7  168.2   N/A   N/A     N/A     N/A      N/A   25.0  42.8  168.0 Analysis Plot     
     20250806 202535       GMI   43.5  170.4   146   N/A    0.92   -0.92      N/A   25.0  43.2  169.8 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.