Tropical Depression 01S

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                 
     20241001 220427       GMI   -9.8   75.7    57   43%    4.47   -4.47      N/A   40.0 -10.2   75.7 Analysis Plot     
     20241002 004540  SSMISF17  -10.1   75.5   101   24%   12.73  -12.73      N/A   40.0 -10.1   75.5 Analysis Plot     
     20241002 093757       GMI  -11.2   74.8    23   39%    7.39   -7.39      N/A   45.0 -10.6   74.8 Analysis Plot     
     20241002 104421  SSMISF18  -11.4   74.5    57   51%    8.78   -8.78      N/A   45.0 -10.7   74.7 Analysis Plot     
     20241002 130152  SSMISF16  -11.4   74.3    68   17%   13.93  -13.93      N/A   50.0 -10.9   74.4 Analysis Plot     
     20241002 132305  SSMISF17  -11.4   74.3    57   28%    9.92   -9.92      N/A   50.0 -11.0   74.4 Analysis Plot     
     20241002 201222     AMSR2  -12.6   73.5    23   83%   11.25  -11.25      N/A   45.0 -12.3   73.1 Analysis Plot     
     20241003 082738     AMSR2  -12.7   71.7   N/A   N/A     N/A     N/A      N/A   45.0 -13.0   71.6 Analysis Plot     
     20241003 130926  SSMISF17  -13.9   71.7   N/A   N/A     N/A     N/A      N/A   35.0 -13.2   71.2 Analysis Plot     
     20241003 221615       GMI  -13.6   69.4   N/A   N/A     N/A     N/A      N/A   30.0 -13.6   69.4 Analysis Plot     
     20241003 232105  SSMISF18  -15.1   69.4   N/A   N/A     N/A     N/A      N/A   30.0 -13.8   69.2 Analysis Plot     
     20241004 013900  SSMISF16  -15.2   68.3   N/A   N/A     N/A     N/A      N/A   30.0 -14.0   68.9 Analysis Plot     
     20241004 020106  SSMISF17  -15.1   68.4   N/A   N/A     N/A     N/A      N/A   30.0 -14.0   68.8 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.