Tropical Depression 04W

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                 
     20240720 051123       GMI   17.1  112.8   N/A   N/A     N/A     N/A      N/A   30.0  15.9  113.6 Analysis Plot     
     20240720 053550     AMSR2   16.5  113.2   N/A   N/A     N/A     N/A      N/A   30.0  16.0  113.4 Analysis Plot     
     20240720 102500  SSMISF17   17.8  112.6   N/A   N/A     N/A     N/A      N/A   30.0  16.2  113.6 Analysis Plot     
     20240720 174854     AMSR2   15.9  112.5    23   N/A    0.32   -0.32      N/A   35.0  16.8  112.6 Analysis Plot     
     20240720 225832  SSMISF17   16.0  110.8    90    6%    0.14   -0.14      N/A   35.0  16.8  111.1 Analysis Plot     
     20240721 061914     AMSR2   17.2  110.8    68   N/A    1.89   -1.89      N/A   35.0  16.7  111.1 Analysis Plot     
     20240721 085208  SSMISF18   18.3  110.5   N/A   N/A     N/A     N/A      N/A   35.0  17.5  110.8 Analysis Plot     
     20240721 101240  SSMISF17   17.7  110.7   N/A   N/A     N/A     N/A      N/A   35.0  17.7  110.7 Analysis Plot     
     20240721 105925  SSMISF16   18.8  110.8   N/A   N/A     N/A     N/A      N/A   35.0  17.8  110.6 Analysis Plot     
     20240721 155900       GMI   18.5  110.3    46   43%   13.56  -13.56      N/A   40.0  18.4  110.5 Analysis Plot     
     20240721 183035     AMSR2   19.0  110.1    23   99%   19.50  -34.50      N/A   50.0  19.0  109.9 Analysis Plot     
     20240721 224535  SSMISF17   19.3  109.2    23   39%    8.59   -8.59      N/A   50.0  19.4  109.6 Analysis Plot     
     20240722 052302       GMI   19.9  108.5    23   97%   19.98  -34.98      N/A   50.0  20.1  108.7 Analysis Plot     
     20240722 083806  SSMISF18   20.3  108.2    46   92%   18.76   33.76  >65 kts   55.0  20.3  108.5 Analysis Plot     
     20240722 104540  SSMISF16   20.4  108.4    23  100%   23.80   38.80  >65 kts   55.0  20.4  108.4 Analysis Plot     
     20240722 151702       GMI   22.0  109.5   N/A   N/A     N/A     N/A      N/A   60.0  20.7  108.1 Analysis Plot     
     20240722 211016  SSMISF18   22.3  107.3   N/A   N/A     N/A     N/A      N/A   55.0  21.3  107.8 Analysis Plot     
     20240722 231754  SSMISF16   22.6  107.4   N/A   N/A     N/A     N/A      N/A   55.0  21.3  107.8 Analysis Plot     
     20240723 044217       GMI   21.5  107.5   N/A   N/A     N/A     N/A      N/A   45.0  21.6  107.4 Analysis Plot     
     20240723 060758     AMSR2   21.8  107.4   N/A   N/A     N/A     N/A      N/A   35.0  21.8  107.3 Analysis Plot     
     20240723 082500  SSMISF18   22.5  107.4   N/A   N/A     N/A     N/A      N/A   35.0  21.8  107.3 Analysis Plot     
     20240723 103238  SSMISF16   22.4  107.3   N/A   N/A     N/A     N/A      N/A   35.0  21.9  107.2 Analysis Plot     
     20240723 181805     AMSR2   22.4  106.4   N/A   N/A     N/A     N/A      N/A   20.0  22.0  106.9 Analysis Plot     
     20240723 205632  SSMISF18   22.1  106.9   N/A   N/A     N/A     N/A      N/A   20.0  21.9  106.8 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.