Tropical Depression 03B

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                 
     20241023 092644  SSMISF18   17.6   89.1   N/A   N/A     N/A     N/A      N/A   35.0  17.0   89.0 Analysis Plot     
     20241023 115917  SSMISF17   18.0   88.8   N/A   N/A     N/A     N/A      N/A   35.0  17.3   88.9 Analysis Plot     
     20241023 142639       GMI   18.0   88.6   N/A   N/A     N/A     N/A      N/A   40.0  17.5   88.8 Analysis Plot     
     20241023 220008  SSMISF18   17.9   87.9    46   79%    4.68    4.68      N/A   55.0  18.6   88.5 Analysis Plot     
     20241024 002105  SSMISF16   18.3   87.4   N/A   N/A     N/A     N/A      N/A   60.0  18.9   88.4 Analysis Plot     
     20241024 003233  SSMISF17   18.4   87.7    46   36%    0.94    0.94      N/A   60.0  19.0   88.3 Analysis Plot     
     20241024 071542     AMSR2   19.3   87.3    12   71%    3.43    3.43      N/A   65.0  19.3   87.5 Analysis Plot     
     20241024 114637  SSMISF17   20.1   87.2    23   19%    4.97    4.97      N/A   65.0  19.5   87.3 Analysis Plot     
     20241024 134327       GMI   19.6   87.0   N/A   N/A     N/A     N/A      N/A   65.0  19.9   87.1 Analysis Plot     
     20241024 192730     AMSR2   20.6   86.9   N/A   N/A     N/A     N/A      N/A   65.0  20.3   87.0 Analysis Plot     
     20241025 001836  SSMISF17   20.9   86.8   235    3%    2.71    2.71      N/A   60.0  20.9   86.8 Analysis Plot     
     20241025 030810       GMI   21.0   86.7    34   22%   10.23   10.23      N/A   60.0  20.9   86.7 Analysis Plot     
     20241025 075930     AMSR2   21.1   86.4    23   44%    1.81   -1.81      N/A   50.0  21.0   86.2 Analysis Plot     
     20241025 200859     AMSR2   21.5   84.5   N/A   N/A     N/A     N/A      N/A   30.0  20.9   85.1 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.