Tropical Storm 08B

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                 
     20231203 003655  SSMISF16   12.3   82.9   146   17%    1.38   -1.38      N/A   35.0  11.7   82.3 Analysis Plot     
     20231203 075106     AMSR2   12.1   82.3   N/A   N/A     N/A     N/A      N/A   35.0  12.1   82.0 Analysis Plot     
     20231203 095342  SSMISF18   12.4   82.6   146   14%    3.00   -3.00      N/A   35.0  12.1   82.4 Analysis Plot     
     20231203 114628  SSMISF16   12.3   82.9   N/A   N/A     N/A     N/A      N/A   35.0  12.2   82.3 Analysis Plot     
     20231203 124229  SSMISF17   12.7   82.7   N/A   N/A     N/A     N/A      N/A   40.0  12.3   82.3 Analysis Plot     
     20231203 200543     AMSR2   13.2   81.8   157   12%    1.82   -1.82      N/A   45.0  13.2   81.7 Analysis Plot     
     20231203 222950  SSMISF18   12.9   81.9   N/A   N/A     N/A     N/A      N/A   45.0  13.3   81.6 Analysis Plot     
     20231204 002252  SSMISF16   13.1   81.7   N/A   N/A     N/A     N/A      N/A   55.0  13.4   81.5 Analysis Plot     
     20231204 011907  SSMISF17   13.1   81.5   223   18%    2.28    2.28      N/A   55.0  13.7   81.1 Analysis Plot     
     20231204 122944  SSMISF17   13.9   80.5   N/A   N/A     N/A     N/A      N/A   60.0  14.1   80.9 Analysis Plot     
     20231204 221659  SSMISF18   14.6   79.9   N/A   N/A     N/A     N/A      N/A   60.0  14.8   80.1 Analysis Plot     
     20231205 000943  SSMISF16   15.0   80.1    68   16%    5.03    5.03      N/A   60.0  15.0   80.1 Analysis Plot     
     20231205 010452  SSMISF17   15.0   79.9   N/A   N/A     N/A     N/A      N/A   60.0  15.1   80.0 Analysis Plot     
     20231205 074030     AMSR2   15.7   80.2   N/A   N/A     N/A     N/A      N/A   55.0  15.5   79.8 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.