Tropical Storm 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                 
     20230829 161019     AMSR2   27.7  -51.5   N/A   N/A     N/A     N/A      N/A   30.0  27.9  -51.3 Analysis Plot     
     20230829 192440  SSMISF18   27.0  -51.7   N/A   N/A     N/A     N/A      N/A   30.0  27.9  -51.3 Analysis Plot     
     20230829 211448  SSMISF17   28.9  -50.6   N/A   N/A     N/A     N/A      N/A   30.0  28.2  -51.8 Analysis Plot     
     20230830 055450     AMSR2   28.5  -52.5   N/A   N/A     N/A     N/A      N/A   30.0  28.4  -52.6 Analysis Plot     
     20230830 075239  SSMISF18   28.0  -51.7   123   12%    0.78   -0.78      N/A   30.0  28.2  -52.1 Analysis Plot     
     20230830 094549  SSMISF16   27.7  -52.2   N/A   N/A     N/A     N/A      N/A   30.0  28.3  -52.1 Analysis Plot     
     20230830 150428       GMI   28.4  -52.2   N/A   N/A     N/A     N/A      N/A   30.0  28.3  -52.1 Analysis Plot     
     20230830 165215     AMSR2   27.9  -52.0   157   14%    3.23   -3.23      N/A   30.0  28.4  -52.1 Analysis Plot     
     20230830 191113  SSMISF18   28.3  -52.5   N/A   N/A     N/A     N/A      N/A   30.0  28.5  -52.1 Analysis Plot     
     20230830 210204  SSMISF17   28.5  -52.6   N/A   N/A     N/A     N/A      N/A   30.0  28.5  -52.3 Analysis Plot     
     20230830 210429  SSMISF16   28.4  -52.5   N/A   N/A     N/A     N/A      N/A   30.0  28.6  -52.3 Analysis Plot     
     20230831 004951       GMI   28.6  -52.0   N/A   N/A     N/A     N/A      N/A   30.0  28.8  -52.3 Analysis Plot     
     20230831 045842     AMSR2   28.3  -52.1   135   10%    4.53   -4.53      N/A   30.0  28.9  -52.4 Analysis Plot     
     20230831 073916  SSMISF18   28.8  -52.3   N/A   N/A     N/A     N/A      N/A   35.0  28.9  -52.2 Analysis Plot     
     20230831 093154  SSMISF16   28.9  -51.9   N/A   N/A     N/A     N/A      N/A   35.0  29.1  -52.2 Analysis Plot     
     20230831 141149       GMI   29.7  -52.0    12   N/A   13.42  -13.42      N/A   40.0  29.8  -52.1 Analysis Plot     
     20230831 185822  SSMISF18   30.6  -52.3   223    1%    1.45   -1.45      N/A   35.0  30.4  -52.1 Analysis Plot     
     20230831 185847  SSMISF18   30.7  -52.3   N/A   N/A     N/A     N/A      N/A   35.0  31.0  -52.2 Analysis Plot     
     20230831 205137  SSMISF16   31.0  -52.3    12   N/A    0.77   -0.77      N/A   35.0  31.1  -52.2 Analysis Plot     
     20230831 235528       GMI   31.3  -52.3   N/A   N/A     N/A     N/A      N/A   35.0  31.4  -52.2 Analysis Plot     
     20230901 053956     AMSR2   33.4  -51.9   101   17%    3.65   -3.65      N/A   50.0  33.9  -52.2 Analysis Plot     
     20230901 072455  SSMISF18   34.3  -51.8   235    7%    1.74   -1.74      N/A   50.0  34.1  -52.0 Analysis Plot     
     20230901 091708  SSMISF16   33.9  -52.0    23   35%    1.75   -1.75      N/A   50.0  34.8  -51.8 Analysis Plot     
     20230901 164220     AMSR2   36.6  -50.3   N/A   N/A     N/A     N/A      N/A   50.0  36.9  -50.5 Analysis Plot     
     20230901 184716  SSMISF18   37.9  -49.8    12   25%    7.27   -7.27      N/A   50.0  37.5  -50.3 Analysis Plot     
     20230901 204050  SSMISF16   39.1  -48.9    12   42%    8.54   -8.54      N/A   45.0  39.4  -49.1 Analysis Plot     
     20230901 230056       GMI   40.7  -48.3   N/A   N/A     N/A     N/A      N/A   45.0  40.7  -48.6 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.