Hurricane 21E

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                 
     20261013 223625  SSMISF18    9.3  -95.7   N/A   N/A     N/A     N/A      N/A   35.0  10.8  -96.9 Analysis Plot     
     20261014 111342  SSMISF18   12.0  -99.1    79   N/A    1.12   -1.12      N/A   40.0  11.4  -99.5 Analysis Plot     
     20261014 140508  SSMISF16   11.7  -99.7    79   22%    1.58   -1.58      N/A   40.0  11.5  -99.6 Analysis Plot     
     20261014 222343  SSMISF18   12.2 -100.4    46   47%    1.49    1.49      N/A   55.0  12.0 -100.2 Analysis Plot     
     20261014 230736       GMI   12.4 -100.3    34   49%    6.89    6.89      N/A   55.0  12.0 -100.2 Analysis Plot     
     20261015 003637  SSMISF17   12.7 -100.3    34   15%    6.30    6.30      N/A   55.0  12.2 -100.4 Analysis Plot     
     20261015 104039       GMI   12.7 -101.5    34    3%   19.71   19.71      N/A   65.0  13.1 -101.8 Analysis Plot     
     20261015 105915  SSMISF18   12.5 -101.6    23   28%    7.29    7.29      N/A   65.0  13.2 -101.9 Analysis Plot     
     20261015 131322  SSMISF17   12.7 -101.2    12   81%    1.44    1.44      N/A   65.0  13.1 -101.6 Analysis Plot     
     20261015 135122  SSMISF16   12.9 -101.5     5   83%   13.51   13.51      N/A   80.0  13.1 -101.6 Analysis Plot     
     20261016 002251  SSMISF17   14.1 -102.2     5   56%    8.04    8.04      N/A   80.0  14.0 -101.8 Analysis Plot     
     20261016 095819       GMI   14.2 -102.4     5   50%    7.97    7.97      N/A   80.0  14.3 -102.4 Analysis Plot     
     20261016 125759  SSMISF17   14.2 -102.4    23   21%    3.38    3.38      N/A  105.0  14.6 -102.5 Analysis Plot     
     20261016 232104       GMI   15.6 -102.4   N/A   N/A     N/A     N/A      N/A   75.0  15.0 -102.6 Analysis Plot     
     20261017 000933  SSMISF17   15.3 -102.7    79   15%    8.02    8.02      N/A   75.0  15.1 -102.7 Analysis Plot     
     20261017 124327  SSMISF17   16.3 -104.1    90  100%   32.15   47.15  >65 kts   80.0  16.6 -103.8 Analysis Plot     
     20261017 223859       GMI   17.5 -105.4    90   43%    6.21    6.21      N/A   85.0  17.7 -105.2 Analysis Plot     
     20261017 232231  SSMISF18   17.9 -105.4    68   19%    4.00    4.00      N/A   85.0  18.0 -105.4 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.