Tropical Depression 16E

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                 
     20251004 230856       GMI   15.5 -106.1   N/A   N/A     N/A     N/A      N/A   40.0  15.6 -106.7 Analysis Plot     
     20251005 083203     AMSR2   16.2 -107.0   190   36%    2.13    2.13      N/A   55.0  16.3 -107.0 Analysis Plot     
     20251006 114951       GMI   17.4 -107.1    79   19%    4.80    4.80      N/A   75.0  17.4 -107.4 Analysis Plot     
     20251006 200814     AMSR2   18.2 -107.8   112   47%   10.31   10.31      N/A   75.0  18.3 -108.0 Analysis Plot     
     20251007 205047     AMSR2   20.0 -110.9   101   46%   10.72   10.72      N/A   95.0  20.0 -110.9 Analysis Plot     
     20251007 223729       GMI   20.0 -111.0    68   33%    1.95    1.95      N/A   95.0  20.0 -111.0 Analysis Plot     
     20251008 090118     AMSR2   21.0 -111.9   279   28%    1.37    1.37      N/A   85.0  21.2 -112.2 Analysis Plot     
     20251008 120153       GMI   21.3 -112.2   246   24%    0.45    0.45      N/A   85.0  21.3 -112.3 Analysis Plot     
     20251008 215353       GMI   22.0 -113.0   N/A   N/A     N/A     N/A      N/A   60.0  22.1 -113.1 Analysis Plot     
     20251009 111937       GMI   23.3 -114.4   N/A   N/A     N/A     N/A      N/A   50.0  23.5 -114.3 Analysis Plot     
     20251009 204008     AMSR2   24.4 -114.9   N/A   N/A     N/A     N/A      N/A   40.0  24.5 -114.9 Analysis Plot     
     20251010 012442  SSMISF17   24.9 -115.0    23   N/A    0.75   -0.75      N/A   45.0  24.8 -115.0 Analysis Plot     
     20251010 021814  SSMISF16   24.9 -115.0    68   N/A    0.95   -0.95      N/A   45.0  24.9 -115.1 Analysis Plot     
     20251010 135355  SSMISF17   26.0 -115.4    79   N/A    3.21   -3.21      N/A   40.0  25.9 -115.2 Analysis Plot     
     20251010 144735  SSMISF16   26.1 -115.5    68   N/A    2.50   -2.50      N/A   40.0  26.0 -115.2 Analysis Plot     
     20251010 220431       GMI   26.5 -115.7   N/A   N/A     N/A     N/A      N/A   30.0  26.4 -115.4 Analysis Plot     
     20251010 235717  SSMISF18   26.6 -115.7    23   N/A    1.83   -1.83      N/A   30.0  26.5 -115.4 Analysis Plot     
     20251011 011115  SSMISF17   26.4 -115.6    79   N/A    1.53   -1.53      N/A   30.0  26.6 -115.4 Analysis Plot     
     20251011 020453  SSMISF16   26.3 -115.5    34   N/A    1.64   -1.64      N/A   30.0  26.7 -115.5 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.