Tropical Depression 09E

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                 
     20250806 221525  SSMISF18   14.7  -99.2    34   22%    2.65   -2.65      N/A   35.0  14.4  -99.6 Analysis Plot     
     20250807 085010     AMSR2   15.4 -103.1   N/A   N/A     N/A     N/A      N/A   35.0  16.2 -103.6 Analysis Plot     
     20250807 105029  SSMISF18   16.0 -103.9   N/A   N/A     N/A     N/A      N/A   35.0  16.5 -104.1 Analysis Plot     
     20250808 093301     AMSR2   20.0 -109.4   N/A   N/A     N/A     N/A      N/A   50.0  20.7 -109.6 Analysis Plot     
     20250808 160230       GMI   20.4 -110.5    12   N/A    1.12   -1.12      N/A   50.0  20.8 -110.3 Analysis Plot     
     20250808 202653     AMSR2   20.4 -111.1    23    8%    9.13    9.13      N/A   55.0  20.4 -111.3 Analysis Plot     
     20250808 233027  SSMISF18   20.5 -111.7   N/A   N/A     N/A     N/A      N/A   55.0  20.5 -111.8 Analysis Plot     
     20250809 005552  SSMISF17   20.5 -112.2   N/A   N/A     N/A     N/A      N/A   55.0  20.5 -112.1 Analysis Plot     
     20250809 052650       GMI   20.7 -112.3    12   N/A    4.10    4.10      N/A   55.0  20.6 -112.4 Analysis Plot     
     20250809 120223  SSMISF18   20.8 -113.2   168   21%    2.12   -2.12      N/A   50.0  20.8 -112.9 Analysis Plot     
     20250809 132736  SSMISF17   20.6 -113.5   168   17%    0.61   -0.61      N/A   50.0  21.0 -112.7 Analysis Plot     
     20250809 210949     AMSR2   20.9 -113.5    34   N/A    3.91   -3.91      N/A   45.0  21.0 -113.7 Analysis Plot     
     20250809 231635  SSMISF18   20.9 -114.1   N/A   N/A     N/A     N/A      N/A   45.0  21.1 -114.0 Analysis Plot     
     20250810 044405       GMI   21.3 -114.4   N/A   N/A     N/A     N/A      N/A   45.0  21.3 -114.4 Analysis Plot     
     20250810 091937     AMSR2   21.8 -115.2   N/A   N/A     N/A     N/A      N/A   35.0  21.6 -115.2 Analysis Plot     
     20250811 020912  SSMISF17   22.9 -117.9    46   N/A    1.91   -1.91      N/A   30.0  22.4 -118.1 Analysis Plot     
     20250811 023316  SSMISF16   22.8 -118.0    68   N/A    1.81   -1.81      N/A   30.0  22.3 -117.9 Analysis Plot     
     20250811 100238     AMSR2   22.9 -119.3   N/A   N/A     N/A     N/A      N/A   30.0  22.8 -119.2 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.