Tropical Depression 24S

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                 
     20240516 151347  SSMISF17   -9.6   51.7   N/A   N/A     N/A     N/A      N/A   35.0  -9.1   52.4 Analysis Plot     
     20240517 003720  SSMISF18  -10.2   51.0   N/A   N/A     N/A     N/A      N/A   35.0  -9.2   51.8 Analysis Plot     
     20240517 024948       GMI  -10.1   50.7   N/A   N/A     N/A     N/A      N/A   35.0  -9.3   51.7 Analysis Plot     
     20240517 102522     AMSR2   -8.9   50.6   N/A   N/A     N/A     N/A      N/A   40.0  -8.9   50.6 Analysis Plot     
     20240518 002344  SSMISF18   -8.7   48.5   179   14%    0.88   -0.88      N/A   40.0  -8.5   48.9 Analysis Plot     
     20240518 022433  SSMISF16   -8.2   48.5   N/A   N/A     N/A     N/A      N/A   40.0  -8.0   49.0 Analysis Plot     
     20240518 130307  SSMISF18   -7.8   47.3    23   26%   11.48  -11.48      N/A   45.0  -7.8   47.8 Analysis Plot     
     20240518 152552       GMI   -7.9   47.3     5   72%   14.43  -14.43      N/A   45.0  -7.7   47.7 Analysis Plot     
     20240518 215646     AMSR2   -7.5   46.4   N/A   N/A     N/A     N/A      N/A   55.0  -7.3   47.2 Analysis Plot     
     20240519 001112  SSMISF18   -7.6   46.4   N/A   N/A     N/A     N/A      N/A   50.0  -7.2   47.1 Analysis Plot     
     20240519 030044       GMI   -7.6   45.9    57   89%   17.48   32.48  >65 kts   55.0  -7.4   46.4 Analysis Plot     
     20240519 033456  SSMISF17   -7.6   46.0    46   79%    8.36    8.36      N/A   55.0  -7.3   46.3 Analysis Plot     
     20240519 101412     AMSR2   -7.3   45.3    12   47%   17.73   17.73      N/A   55.0  -7.0   45.9 Analysis Plot     
     20240519 124946  SSMISF18   -7.2   44.8     5   82%    2.07    2.07      N/A   55.0  -7.3   45.2 Analysis Plot     
     20240519 145031  SSMISF16   -7.1   45.0   N/A   N/A     N/A     N/A      N/A   55.0  -7.2   45.1 Analysis Plot     
     20240520 031945  SSMISF17   -6.7   43.8    34   49%    5.29    5.29      N/A   55.0  -5.8   44.3 Analysis Plot     
     20240520 105725     AMSR2   -5.9   43.4     5   47%    8.20    8.20      N/A   55.0  -5.1   43.5 Analysis Plot     
     20240520 123730  SSMISF18   -5.8   43.2   101   43%    7.87   -7.87      N/A   50.0  -5.7   43.8 Analysis Plot     
     20240520 143859  SSMISF16   -5.8   43.2    23   25%   21.52  -21.52      N/A   50.0  -5.4   43.7 Analysis Plot     
     20240521 012409  SSMISF18   -5.6   42.7   N/A   N/A     N/A     N/A      N/A   55.0  -4.9   42.9 Analysis Plot     
     20240521 030559  SSMISF17   -5.3   42.3    90   56%    1.53    1.53      N/A   55.0  -4.8   42.9 Analysis Plot     
     20240521 032309  SSMISF16   -5.2   42.5   101   56%    4.67    4.67      N/A   55.0  -4.8   42.8 Analysis Plot     
     20240521 145235       GMI   -4.3   42.0     5   64%   13.14   13.14      N/A   60.0  -4.3   42.1 Analysis Plot     
     20240522 010927  SSMISF18   -3.9   41.6   N/A   N/A     N/A     N/A      N/A   45.0  -2.7   41.9 Analysis Plot     
     20240522 022931       GMI   -3.7   41.8   N/A   N/A     N/A     N/A      N/A   45.0  -2.9   42.0 Analysis Plot     
     20240522 031041  SSMISF16   -3.8   41.7   N/A   N/A     N/A     N/A      N/A   45.0  -2.7   42.0 Analysis Plot     
     20240522 140846       GMI   -2.3   41.0   N/A   N/A     N/A     N/A      N/A   30.0  -2.9   41.8 Analysis Plot     
     20240522 153332  SSMISF17   -3.9   42.9   N/A   N/A     N/A     N/A      N/A   30.0  -2.8   41.8 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.