Tropical Depression 11L

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                 
     20240927 045501     AMSR2   18.4  -43.0   190    7%    3.24   -3.24      N/A   35.0  18.1  -43.0 Analysis Plot     
     20240927 154850     AMSR2   18.4  -42.5    34    1%    1.68   -1.68      N/A   35.0  18.3  -43.2 Analysis Plot     
     20240927 184823  SSMISF18   18.5  -42.9   101   10%    0.39   -0.39      N/A   35.0  18.5  -43.5 Analysis Plot     
     20240927 192758       GMI   18.6  -43.7    34   83%    8.20   -8.20      N/A   45.0  18.5  -43.7 Analysis Plot     
     20240927 210522  SSMISF16   18.9  -43.7    12   68%    7.63   -7.63      N/A   45.0  18.6  -44.1 Analysis Plot     
     20240927 213027  SSMISF17   19.3  -44.0   N/A   N/A     N/A     N/A      N/A   45.0  18.7  -44.2 Analysis Plot     
     20240928 072144  SSMISF18   18.7  -45.1   N/A   N/A     N/A     N/A      N/A   45.0  19.2  -45.5 Analysis Plot     
     20240928 093833  SSMISF16   19.4  -45.3   N/A   N/A     N/A     N/A      N/A   45.0  19.7  -45.7 Analysis Plot     
     20240928 163124     AMSR2   20.0  -46.0   N/A   N/A     N/A     N/A      N/A   45.0  20.2  -46.4 Analysis Plot     
     20240928 183525  SSMISF18   20.2  -46.7   201    4%    5.61   -5.61      N/A   45.0  20.3  -46.6 Analysis Plot     
     20240928 205228  SSMISF16   20.2  -46.7   N/A   N/A     N/A     N/A      N/A   40.0  20.3  -46.7 Analysis Plot     
     20240928 211535  SSMISF17   20.3  -46.6   N/A   N/A     N/A     N/A      N/A   40.0  20.3  -46.8 Analysis Plot     
     20240929 061403       GMI   21.1  -47.9   N/A   N/A     N/A     N/A      N/A   40.0  21.1  -47.9 Analysis Plot     
     20240929 070741  SSMISF18   21.1  -47.7    68   18%    0.62   -0.62      N/A   40.0  21.3  -48.2 Analysis Plot     
     20240929 092440  SSMISF16   21.2  -48.3   101   N/A    3.19   -3.19      N/A   40.0  21.4  -48.3 Analysis Plot     
     20240929 094724  SSMISF17   21.1  -48.2   257    1%    5.64   -5.64      N/A   40.0  21.5  -48.3 Analysis Plot     
     20240929 182333  SSMISF18   21.7  -48.7   112   17%    2.57   -2.57      N/A   40.0  21.9  -48.8 Analysis Plot     
     20240929 193853       GMI   21.9  -49.3   N/A   N/A     N/A     N/A      N/A   35.0  22.0  -48.8 Analysis Plot     
     20240929 193855       GMI   21.5  -49.3   N/A   N/A     N/A     N/A      N/A   35.0  22.0  -48.9 Analysis Plot     
     20240929 204040  SSMISF16   22.1  -49.3   168    1%    3.88   -3.88      N/A   35.0  22.2  -49.2 Analysis Plot     
     20240929 210225  SSMISF17   22.3  -49.5   123   N/A    2.94   -2.94      N/A   35.0  22.2  -49.3 Analysis Plot     
     20240930 052438     AMSR2   22.5  -49.8   N/A   N/A     N/A     N/A      N/A   30.0  22.5  -49.8 Analysis Plot     
     20240930 065509  SSMISF18   22.4  -49.7   N/A   N/A     N/A     N/A      N/A   30.0  22.5  -49.8 Analysis Plot     
     20240930 093328  SSMISF17   22.0  -49.1    68    7%    0.69   -0.69      N/A   30.0  22.1  -49.8 Analysis Plot     
     20240930 162009     AMSR2   22.4  -49.0   N/A   N/A     N/A     N/A      N/A   30.0  22.6  -49.3 Analysis Plot     
     20240930 185720       GMI   22.1  -48.8   N/A   N/A     N/A     N/A      N/A   30.0  22.6  -49.3 Analysis Plot     
     20240930 204907  SSMISF17   22.4  -48.8    79   24%    1.81   -1.81      N/A   30.0  22.7  -48.9 Analysis Plot     
     20241001 091933  SSMISF17   23.7  -50.8   N/A   N/A     N/A     N/A      N/A   30.0  23.9  -49.0 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.