Tropical Storm 04E

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                 
     20250613 084616     AMSR2   12.8 -101.2   135    7%    1.17   -1.17      N/A   30.0  12.3 -100.6 Analysis Plot     
     20250613 133018  SSMISF17   13.9 -101.1   N/A   N/A     N/A     N/A      N/A   30.0  13.9 -101.6 Analysis Plot     
     20250614 004010  SSMISF17   15.1 -102.8   123   17%    0.46   -0.46      N/A   35.0  15.4 -103.1 Analysis Plot     
     20250614 073812       GMI   16.6 -102.8   N/A   N/A     N/A     N/A      N/A   45.0  15.7 -103.6 Analysis Plot     
     20250614 114030  SSMISF18   16.2 -102.9   N/A   N/A     N/A     N/A      N/A   50.0  16.3 -104.6 Analysis Plot     
     20250614 201956     AMSR2   17.2 -105.2   190   25%    2.65    2.65      N/A   55.0  16.8 -105.5 Analysis Plot     
     20250614 225100  SSMISF18   17.7 -106.3   N/A   N/A     N/A     N/A      N/A   55.0  16.9 -105.9 Analysis Plot     
     20250615 002759  SSMISF17   18.0 -105.5    90    1%    1.19    1.19      N/A   55.0  17.0 -106.1 Analysis Plot     
     20250615 083233     AMSR2   18.1 -107.1    90   18%    1.20    1.20      N/A   55.0  18.1 -107.5 Analysis Plot     
     20250615 112452  SSMISF18   18.0 -107.4   201    8%    2.48   -2.48      N/A   50.0  18.1 -107.9 Analysis Plot     
     20250615 130104  SSMISF17   18.1 -107.8    12   N/A    1.16   -1.16      N/A   50.0  18.2 -108.1 Analysis Plot     
     20250615 201739       GMI   18.3 -108.5   N/A   N/A     N/A     N/A      N/A   40.0  18.3 -108.6 Analysis Plot     
     20250615 210422     AMSR2   18.4 -108.8   N/A   N/A     N/A     N/A      N/A   40.0  18.2 -108.5 Analysis Plot     
     20250615 223813  SSMISF18   18.5 -109.1    79   N/A    3.76   -3.76      N/A   40.0  18.2 -108.7 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.