Tropical Storm 06W

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                 
     20250711 210245       GMI   25.2  140.3    68   N/A    1.95   -1.95      N/A   35.0  25.3  140.1 Analysis Plot     
     20250712 041803     AMSR2   25.2  141.7   101    9%    1.56   -1.56      N/A   35.0  25.4  140.9 Analysis Plot     
     20250712 065419       GMI   25.4  141.0   190    3%    1.58   -1.58      N/A   35.0  25.4  140.9 Analysis Plot     
     20250712 162500     AMSR2   25.2  142.1    68   12%    1.12   -1.12      N/A   35.0  25.8  141.9 Analysis Plot     
     20250712 202132       GMI   26.0  142.2   N/A   N/A     N/A     N/A      N/A   35.0  26.1  142.1 Analysis Plot     
     20250713 032322     AMSR2   27.6  143.1   179   11%    1.51   -1.51      N/A   35.0  27.8  142.5 Analysis Plot     
     20250713 061135       GMI   27.8  143.0   N/A   N/A     N/A     N/A      N/A   35.0  28.1  142.5 Analysis Plot     
     20250714 040845     AMSR2   36.0  142.5   N/A   N/A     N/A     N/A      N/A   45.0  36.1  142.5 Analysis Plot     
     20250714 052723       GMI   36.4  142.6   N/A   N/A     N/A     N/A      N/A   45.0  36.3  142.6 Analysis Plot     
     20250714 160820     AMSR2   42.5  144.0   N/A   N/A     N/A     N/A      N/A   40.0  42.5  144.0 Analysis Plot     
     20250714 203708       GMI   43.7  144.2   N/A   N/A     N/A     N/A      N/A   40.0  43.4  144.4 Analysis Plot     
     20250715 031516     AMSR2   46.2  147.4   N/A   N/A     N/A     N/A      N/A   35.0  46.2  147.3 Analysis Plot     
     20250715 044332       GMI   46.3  147.8   N/A   N/A     N/A     N/A      N/A   35.0  46.4  147.4 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.