Tropical Depression 18E

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                 
     20251024 213252     AMSR2   13.6 -116.5   146    7%    1.09   -1.09      N/A   30.0  13.2 -116.2 Analysis Plot     
     20251024 235758  SSMISF18   13.3 -116.6    90   15%    3.83   -3.83      N/A   30.0  13.2 -116.5 Analysis Plot     
     20251025 011121  SSMISF17   13.3 -116.6    90   15%    2.90   -2.90      N/A   30.0  13.2 -116.6 Analysis Plot     
     20251025 021102  SSMISF16   14.8 -116.6   N/A   N/A     N/A     N/A      N/A   30.0  13.2 -116.8 Analysis Plot     
     20251025 094644     AMSR2   14.0 -117.7   168   46%    3.14   -3.14      N/A   35.0  13.4 -117.9 Analysis Plot     
     20251025 123457  SSMISF18   14.5 -118.3   N/A   N/A     N/A     N/A      N/A   45.0  13.4 -118.2 Analysis Plot     
     20251025 134618  SSMISF17   13.6 -118.2    57   29%    6.84   -6.84      N/A   45.0  13.5 -118.1 Analysis Plot     
     20251025 144659  SSMISF16   13.4 -118.2    57   26%   12.44  -12.44      N/A   45.0  13.5 -118.2 Analysis Plot     
     20251025 175439       GMI   13.6 -118.5   123    4%    0.06   -0.06      N/A   45.0  13.6 -118.4 Analysis Plot     
     20251025 234355  SSMISF18   13.3 -119.3   112   10%    4.77   -4.77      N/A   45.0  13.5 -119.2 Analysis Plot     
     20251026 121955  SSMISF18   13.4 -119.1    68   N/A    2.14   -2.14      N/A   45.0  13.4 -119.7 Analysis Plot     
     20251026 143343  SSMISF16   14.0 -119.1   101   21%    2.00   -2.00      N/A   45.0  13.7 -119.9 Analysis Plot     
     20251026 233040  SSMISF18   14.1 -119.8    46   N/A    3.15   -3.15      N/A   40.0  13.9 -120.0 Analysis Plot     
     20251027 022358  SSMISF17   14.2 -119.7    34   N/A    5.36   -5.36      N/A   40.0  14.0 -120.1 Analysis Plot     
     20251027 063256       GMI   14.0 -120.1   101   15%    1.42   -1.42      N/A   40.0  14.2 -120.3 Analysis Plot     
     20251027 120544  SSMISF18   13.7 -120.7   N/A   N/A     N/A     N/A      N/A   40.0  14.3 -121.1 Analysis Plot     
     20251028 020822  SSMISF17   14.9 -121.8    68   12%    1.54   -1.54      N/A   35.0  14.2 -122.2 Analysis Plot     
     20251028 031155  SSMISF16   14.9 -121.9   101   14%    1.18   -1.18      N/A   35.0  14.5 -122.3 Analysis Plot     
     20251028 101734     AMSR2   15.1 -123.1   N/A   N/A     N/A     N/A      N/A   40.0  14.9 -123.4 Analysis Plot     
     20251028 144412  SSMISF17   16.5 -125.1   N/A   N/A     N/A     N/A      N/A   40.0  15.1 -123.6 Analysis Plot     
     20251028 172135       GMI   15.3 -123.9   N/A   N/A     N/A     N/A      N/A   40.0  15.2 -123.8 Analysis Plot     
     20251028 211013     AMSR2   15.1 -124.7   N/A   N/A     N/A     N/A      N/A   40.0  15.4 -124.5 Analysis Plot     
     20251029 004431  SSMISF18   15.5 -125.2   212   N/A    3.09   -3.09      N/A   40.0  15.4 -124.9 Analysis Plot     
     20251029 015521  SSMISF17   15.8 -125.2   N/A   N/A     N/A     N/A      N/A   35.0  15.4 -125.0 Analysis Plot     
     20251029 025739  SSMISF16   15.6 -125.4    23   N/A    2.58   -2.58      N/A   35.0  15.4 -125.3 Analysis Plot     
     20251029 064327       GMI   15.9 -125.8   N/A   N/A     N/A     N/A      N/A   35.0  15.4 -126.0 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.