Hurricane 20E

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                 
     20261008 134742  SSMISF16   15.4 -103.9   N/A   N/A     N/A     N/A      N/A   55.0  15.4 -103.3 Analysis Plot     
     20261009 002313  SSMISF17   15.8 -104.0    79    8%    1.90    1.90      N/A   65.0  15.9 -104.2 Analysis Plot     
     20261009 125719  SSMISF17   15.6 -104.8   101   28%    4.28    4.28      N/A   80.0  16.0 -104.7 Analysis Plot     
     20261009 233549  SSMISF18   16.8 -104.6    23   93%    7.63   22.63  >65 kts   90.0  16.4 -104.7 Analysis Plot     
     20261010 010557       GMI   16.7 -104.7     5   92%    2.53   17.53      N/A   90.0  16.4 -104.7 Analysis Plot     
     20261010 022529  SSMISF16   16.8 -104.6    23   96%    7.72   22.72  >65 kts   90.0  16.8 -104.6 Analysis Plot     
     20261010 124257  SSMISF17   17.1 -105.0    12  100%   45.39   60.39  >85 kts  120.0  17.5 -104.6 Analysis Plot     
     20261010 232134  SSMISF18   18.0 -105.0    12  100%   60.92   75.92  >85 kts  130.0  17.8 -104.8 Analysis Plot     
     20261011 021132  SSMISF16   18.2 -104.9    12  100%   51.39   66.39  >85 kts  130.0  18.0 -104.8 Analysis Plot     
     20261011 115335       GMI   18.8 -105.3    12  100%   49.10   64.10  >85 kts  135.0  19.0 -105.4 Analysis Plot     
     20261011 115456  SSMISF18   18.7 -105.2    12  100%   28.17   43.17  >65 kts  135.0  19.2 -105.4 Analysis Plot     
     20261011 230748  SSMISF18   19.8 -106.0   N/A   N/A     N/A     N/A      N/A  115.0  19.8 -105.9 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.