Tropical Depression 13E

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                 
     20230919 135241  SSMISF16   14.9 -119.3   N/A   N/A     N/A     N/A      N/A   30.0  15.0 -119.1 Analysis Plot     
     20230919 212100     AMSR2   14.7 -121.2    12   N/A    1.60   -1.60      N/A   40.0  15.1 -121.2 Analysis Plot     
     20230920 010432  SSMISF16   14.8 -121.4   N/A   N/A     N/A     N/A      N/A   40.0  15.3 -121.7 Analysis Plot     
     20230920 023304  SSMISF17   14.8 -121.6   N/A   N/A     N/A     N/A      N/A   40.0  14.6 -121.6 Analysis Plot     
     20230920 093440     AMSR2   15.1 -124.3   N/A   N/A     N/A     N/A      N/A   40.0  14.9 -122.8 Analysis Plot     
     20230920 114808  SSMISF18   15.9 -123.9   N/A   N/A     N/A     N/A      N/A   45.0  15.0 -123.1 Analysis Plot     
     20230920 133948  SSMISF16   16.0 -123.5    23   93%    1.47  -16.47      N/A   45.0  15.2 -123.5 Analysis Plot     
     20230920 150847  SSMISF17   16.1 -123.3   N/A   N/A     N/A     N/A      N/A   45.0  15.3 -123.7 Analysis Plot     
     20230920 220448     AMSR2   16.6 -124.3    46   44%    4.28   -4.28      N/A   45.0  15.8 -124.4 Analysis Plot     
     20230920 232956       GMI   16.3 -123.7   N/A   N/A     N/A     N/A      N/A   45.0  15.9 -124.5 Analysis Plot     
     20230921 021956  SSMISF17   17.4 -123.9   N/A   N/A     N/A     N/A      N/A   45.0  16.0 -124.8 Analysis Plot     
     20230921 101635     AMSR2   17.7 -124.1   N/A   N/A     N/A     N/A      N/A   45.0  17.8 -125.8 Analysis Plot     
     20230921 124709       GMI   17.8 -126.0   N/A   N/A     N/A     N/A      N/A   45.0  17.9 -125.9 Analysis Plot     
     20230921 145410  SSMISF17   17.3 -125.8   279   N/A    1.93   -1.93      N/A   40.0  17.2 -125.6 Analysis Plot     
     20230922 002713  SSMISF18   17.5 -126.2   N/A   N/A     N/A     N/A      N/A   35.0  18.4 -125.8 Analysis Plot     
     20230922 002728  SSMISF18   18.5 -125.8   212    4%    3.67   -3.67      N/A   35.0  18.6 -125.9 Analysis Plot     
     20230922 020736  SSMISF17   18.8 -125.8   157    7%    4.64   -4.64      N/A   35.0  18.7 -125.9 Analysis Plot     
     20230922 130103  SSMISF18   20.1 -124.5   N/A   N/A     N/A     N/A      N/A   30.0  20.3 -126.0 Analysis Plot     
     20230922 143951  SSMISF17   20.6 -125.0   N/A   N/A     N/A     N/A      N/A   30.0  20.7 -125.8 Analysis Plot     
     20230922 215333     AMSR2   22.0 -124.0   N/A   N/A     N/A     N/A      N/A   30.0  21.7 -125.7 Analysis Plot     
     20230922 231744       GMI   22.3 -124.0   N/A   N/A     N/A     N/A      N/A   30.0  21.7 -125.7 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.