Tropical Depression 10W

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                 
     20240819 072310  SSMISF18   26.8  125.8   190   N/A    3.39   -3.39      N/A   35.0  26.6  125.9 Analysis Plot     
     20240819 093427  SSMISF16   27.4  126.0   257    3%    3.56   -3.56      N/A   35.0  27.4  126.0 Analysis Plot     
     20240819 201201       GMI   29.4  127.0   N/A   N/A     N/A     N/A      N/A   35.0  29.8  125.5 Analysis Plot     
     20240819 220202  SSMISF16   30.4  126.3   N/A   N/A     N/A     N/A      N/A   35.0  30.7  125.5 Analysis Plot     
     20240819 224406  SSMISF17   29.7  127.3   N/A   N/A     N/A     N/A      N/A   35.0  30.8  125.5 Analysis Plot     
     20240820 055959       GMI   32.8  125.5   N/A   N/A     N/A     N/A      N/A   35.0  32.8  125.5 Analysis Plot     
     20240820 071124  SSMISF18   33.1  126.1   N/A   N/A     N/A     N/A      N/A   35.0  33.2  125.5 Analysis Plot     
     20240820 100502  SSMISF17   34.4  126.2   N/A   N/A     N/A     N/A      N/A   30.0  34.1  125.6 Analysis Plot     
     20240820 170017     AMSR2   34.8  127.2   N/A   N/A     N/A     N/A      N/A   25.0  36.1  126.1 Analysis Plot     
     20240820 193557  SSMISF18   37.1  125.2   N/A   N/A     N/A     N/A      N/A   25.0  36.6  126.2 Analysis Plot     
     20240820 214705  SSMISF16   37.8  125.3   N/A   N/A     N/A     N/A      N/A   20.0  37.3  126.2 Analysis Plot     
     20240820 222731  SSMISF17   38.1  125.5   190   17%    0.98   -0.98      N/A   20.0  37.5  126.3 Analysis Plot     
     20240821 051630       GMI   39.1  127.8   101   10%    4.53   -4.53      N/A   20.0  38.9  127.0 Analysis Plot     
     20240821 065923  SSMISF18   37.7  127.3   N/A   N/A     N/A     N/A      N/A   20.0  39.3  127.3 Analysis Plot     
     20240821 095306  SSMISF17   40.3  127.7   N/A   N/A     N/A     N/A      N/A   20.0  40.0  128.0 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.