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                 
     20231011 031954     AMSR2    9.2  -31.2   N/A   N/A     N/A     N/A      N/A   30.0   9.8  -32.4 Analysis Plot     
     20231011 083904  SSMISF17   10.4  -33.5   N/A   N/A     N/A     N/A      N/A   35.0  10.4  -33.5 Analysis Plot     
     20231011 154545     AMSR2   11.4  -34.6   112   10%    2.42   -2.42      N/A   35.0  11.1  -34.6 Analysis Plot     
     20231011 181649  SSMISF18   11.4  -35.3   101   11%    1.01   -1.01      N/A   35.0  11.3  -35.0 Analysis Plot     
     20231011 200952  SSMISF16   11.7  -35.0   179   19%    1.09   -1.09      N/A   35.0  11.6  -35.3 Analysis Plot     
     20231012 003700       GMI   11.8  -35.8    79    3%    4.64   -4.64      N/A   35.0  11.8  -35.8 Analysis Plot     
     20231012 040059     AMSR2   12.4  -36.3    12   N/A    1.42   -1.42      N/A   30.0  12.2  -36.6 Analysis Plot     
     20231012 065437  SSMISF18   12.3  -36.4   N/A   N/A     N/A     N/A      N/A   30.0  12.7  -37.0 Analysis Plot     
     20231012 120517       GMI   13.2  -37.0   N/A   N/A     N/A     N/A      N/A   30.0  12.7  -37.0 Analysis Plot     
     20231012 180442  SSMISF18   13.5  -38.3   179    4%    3.75   -3.75      N/A   35.0  14.0  -38.5 Analysis Plot     
     20231012 195703  SSMISF16   13.5  -37.8   146   17%    0.97   -0.97      N/A   35.0  14.0  -38.5 Analysis Plot     
     20231012 211659  SSMISF17   14.0  -38.4    23   N/A    1.51   -1.51      N/A   35.0  14.1  -38.7 Analysis Plot     
     20231013 044358     AMSR2   14.2  -39.9   N/A   N/A     N/A     N/A      N/A   40.0  14.4  -40.0 Analysis Plot     
     20231013 064032  SSMISF18   13.3  -39.6   N/A   N/A     N/A     N/A      N/A   40.0  14.3  -40.5 Analysis Plot     
     20231013 083254  SSMISF16   15.6  -40.1   N/A   N/A     N/A     N/A      N/A   40.0  14.4  -40.8 Analysis Plot     
     20231013 194536  SSMISF16   14.5  -42.5   N/A   N/A     N/A     N/A      N/A   35.0  14.9  -42.5 Analysis Plot     
     20231013 210246  SSMISF17   14.9  -42.3    79   N/A    3.58   -3.58      N/A   35.0  15.0  -42.6 Analysis Plot     
     20231014 002641       GMI   15.1  -42.5   146    3%    0.83   -0.83      N/A   35.0  15.3  -42.9 Analysis Plot     
     20231014 062821  SSMISF18   15.8  -43.9   N/A   N/A     N/A     N/A      N/A   35.0  15.6  -43.5 Analysis Plot     
     20231014 082003  SSMISF16   15.9  -43.6   190    1%    4.94   -4.94      N/A   35.0  15.5  -43.5 Analysis Plot     
     20231014 115326       GMI   15.9  -43.9   N/A   N/A     N/A     N/A      N/A   35.0  15.6  -43.6 Analysis Plot     
     20231014 161804     AMSR2   16.1  -44.4    57   19%    0.65   -0.65      N/A   30.0  16.1  -44.4 Analysis Plot     
     20231014 205009  SSMISF17   16.3  -44.7   279    8%    4.96   -4.96      N/A   30.0  16.5  -44.8 Analysis Plot     
     20231015 043052     AMSR2   17.5  -45.5    12   N/A    5.82   -5.82      N/A   30.0  17.1  -46.0 Analysis Plot     
     20231015 092409  SSMISF17   17.5  -46.4   212    6%    3.85   -3.85      N/A   30.0  17.5  -46.4 Analysis Plot     
     20231015 190718  SSMISF18   18.2  -47.8    90    1%    1.92   -1.92      N/A   25.0  17.9  -48.0 Analysis Plot     
     20231015 205928  SSMISF16   18.0  -48.5   N/A   N/A     N/A     N/A      N/A   25.0  18.0  -48.5 Analysis Plot     
     20231016 001605       GMI   17.7  -49.0   N/A   N/A     N/A     N/A      N/A   25.0  18.1  -48.7 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.