Tropical Depression 08E

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                 
     20230814 105503     AMSR2   11.3 -140.1   168   15%    0.33   -0.33      N/A   35.0  11.3 -140.7 Analysis Plot     
     20230814 131223  SSMISF18   11.3 -140.6   235   18%    3.97   -3.97      N/A   35.0  11.3 -140.9 Analysis Plot     
     20230814 150504  SSMISF16   11.3 -141.3    79   22%    0.06   -0.06      N/A   35.0  11.3 -141.3 Analysis Plot     
     20230814 232349     AMSR2   11.7 -142.8   N/A   N/A     N/A     N/A      N/A   35.0  11.3 -142.4 Analysis Plot     
     20230815 035923  SSMISF17   11.1 -143.9   N/A   N/A     N/A     N/A      N/A   40.0  11.3 -143.6 Analysis Plot     
     20230815 113818     AMSR2   11.3 -145.3   N/A   N/A     N/A     N/A      N/A   45.0  11.3 -145.6 Analysis Plot     
     20230815 145318  SSMISF16   11.4 -145.9   112   32%    2.08   -2.08      N/A   45.0  11.1 -146.2 Analysis Plot     
     20230815 163717  SSMISF17   11.2 -146.1   157   28%    4.20   -4.20      N/A   45.0  11.1 -146.6 Analysis Plot     
     20230816 005115       GMI   11.5 -147.2   N/A   N/A     N/A     N/A      N/A   45.0  11.4 -148.0 Analysis Plot     
     20230816 014937  SSMISF18   12.3 -148.9   N/A   N/A     N/A     N/A      N/A   45.0  11.5 -148.4 Analysis Plot     
     20230816 034311  SSMISF16   12.2 -148.1   157   17%    1.22   -1.22      N/A   45.0  11.6 -148.5 Analysis Plot     
     20230816 034643  SSMISF17   11.8 -148.4   201   12%    3.17   -3.17      N/A   45.0  11.6 -148.8 Analysis Plot     
     20230816 121907       GMI   12.4 -150.2   N/A   N/A     N/A     N/A      N/A   45.0  11.9 -150.3 Analysis Plot     
     20230816 142722  SSMISF18   11.8 -151.3   268    4%    1.82   -1.82      N/A   45.0  11.8 -151.3 Analysis Plot     
     20230816 162321  SSMISF17   11.9 -151.6   N/A   N/A     N/A     N/A      N/A   45.0  11.9 -151.6 Analysis Plot     
     20230816 231157     AMSR2   11.9 -153.0   N/A   N/A     N/A     N/A      N/A   40.0  12.0 -153.1 Analysis Plot     
     20230817 013736  SSMISF18   11.9 -153.2   N/A   N/A     N/A     N/A      N/A   40.0  12.1 -153.6 Analysis Plot     
     20230817 032937  SSMISF16   12.1 -153.7   235   10%    3.64   -3.64      N/A   40.0  12.1 -153.7 Analysis Plot     
     20230817 141412  SSMISF18   12.0 -155.6   268    3%    2.96   -2.96      N/A   35.0  11.9 -155.7 Analysis Plot     
     20230817 160653  SSMISF16   11.9 -156.0   268    4%    3.60   -3.60      N/A   35.0  11.9 -156.1 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.