Tropical Storm 06L

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                 
     20250823 212318  SSMISF17   27.0  -61.2    46   N/A    1.21   -1.21      N/A   35.0  27.3  -61.3 Analysis Plot     
     20250823 215418  SSMISF16   27.2  -61.0    23   N/A    1.33   -1.33      N/A   35.0  27.4  -61.3 Analysis Plot     
     20250823 220721       GMI   28.1  -61.4   168    3%    3.94   -3.94      N/A   35.0  27.5  -61.3 Analysis Plot     
     20250824 075637       GMI   29.6  -60.9    46   22%    1.32   -1.32      N/A   35.0  29.8  -60.9 Analysis Plot     
     20250824 095122  SSMISF17   29.6  -60.8   N/A   N/A     N/A     N/A      N/A   35.0  30.2  -60.5 Analysis Plot     
     20250824 171137     AMSR2   31.2  -59.7   212   17%    5.50   -5.50      N/A   35.0  31.6  -59.8 Analysis Plot     
     20250824 212613       GMI   31.5  -60.0    23   81%   10.24  -10.24      N/A   40.0  31.9  -59.8 Analysis Plot     
     20250825 071401       GMI   33.3  -59.2   146   10%    1.83   -1.83      N/A   45.0  33.3  -58.8 Analysis Plot     
     20250825 081230  SSMISF18   33.4  -58.9   179   11%    3.34   -3.34      N/A   45.0  33.8  -58.8 Analysis Plot     
     20250826 063147       GMI   36.6  -55.7   223   N/A    2.30   -2.30      N/A   45.0  36.7  -55.7 Analysis Plot     
     20250826 170107     AMSR2   37.9  -54.2   N/A   N/A     N/A     N/A      N/A   35.0  37.9  -54.2 Analysis Plot     
     20250827 054959       GMI   38.8  -51.3   201   15%    2.89   -2.89      N/A   40.0  38.8  -51.3 Analysis Plot     
     20250827 074255  SSMISF18   38.3  -51.4   135    3%    3.19   -3.19      N/A   40.0  38.3  -50.7 Analysis Plot     
     20250827 160559     AMSR2   38.5  -48.9   N/A   N/A     N/A     N/A      N/A   40.0  38.6  -48.9 Analysis Plot     
     20250827 190701  SSMISF18   38.9  -48.1   179   N/A    2.05   -2.05      N/A   45.0  38.9  -48.1 Analysis Plot     
     20250827 190716  SSMISF18   39.1  -47.8   223   N/A    3.67   -3.67      N/A   45.0  39.3  -47.4 Analysis Plot     
     20250828 050836       GMI   40.2  -44.9   257    1%    4.88   -4.88      N/A   45.0  40.2  -44.9 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.