Tropical Depression 19L

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                 
     20241114 192247       GMI   15.8  -83.4    90   10%    3.31   -3.31      N/A   35.0  15.7  -83.2 Analysis Plot     
     20241114 234517  SSMISF16   16.6  -84.1   135    8%    3.04   -3.04      N/A   35.0  16.0  -83.9 Analysis Plot     
     20241115 071755     AMSR2   16.0  -85.3    57   24%   12.10  -12.10      N/A   40.0  16.0  -85.1 Analysis Plot     
     20241115 095500  SSMISF18   15.8  -85.8    90   10%    4.10   -4.10      N/A   40.0  16.1  -85.3 Analysis Plot     
     20241115 122144  SSMISF17   15.4  -85.8    46   N/A    5.31   -5.31      N/A   45.0  16.1  -85.4 Analysis Plot     
     20241115 210721  SSMISF18   16.2  -86.4   168    4%    6.66   -6.66      N/A   45.0  16.2  -86.2 Analysis Plot     
     20241115 233310  SSMISF17   16.3  -86.3   190   25%    4.46   -4.46      N/A   45.0  16.3  -86.3 Analysis Plot     
     20241116 080301       GMI   16.2  -86.4   123    8%    1.25   -1.25      N/A   40.0  16.2  -86.4 Analysis Plot     
     20241116 094121  SSMISF18   16.0  -86.6   123   10%    2.21   -2.21      N/A   40.0  16.1  -86.3 Analysis Plot     
     20241116 120727  SSMISF17   15.9  -86.4   146    1%    4.06   -4.06      N/A   40.0  16.1  -86.4 Analysis Plot     
     20241116 185322     AMSR2   16.3  -86.7   N/A   N/A     N/A     N/A      N/A   40.0  16.4  -86.8 Analysis Plot     
     20241116 232013  SSMISF17   16.5  -87.2   N/A   N/A     N/A     N/A      N/A   40.0  16.5  -87.2 Analysis Plot     
     20241117 070636     AMSR2   16.5  -87.7   112   23%    1.59   -1.59      N/A   35.0  16.8  -87.8 Analysis Plot     
     20241117 092833  SSMISF18   17.0  -88.1   135    8%    3.08   -3.08      N/A   35.0  16.9  -88.0 Analysis Plot     
     20241117 115347  SSMISF17   17.0  -88.5   146    6%    4.02   -4.02      N/A   35.0  17.1  -88.3 Analysis Plot     
     20241117 185138       GMI   17.9  -90.2   N/A   N/A     N/A     N/A      N/A   30.0  17.5  -89.0 Analysis Plot     
     20241117 193638     AMSR2   17.0  -89.5   N/A   N/A     N/A     N/A      N/A   30.0  17.6  -89.2 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.