Tropical Depression 30W

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                 
     20251018 041112       GMI   13.8  125.9   N/A   N/A     N/A     N/A      N/A   30.0  13.0  125.1 Analysis Plot     
     20251018 175449     AMSR2   14.5  121.9    79    3%    2.88   -2.88      N/A   35.0  14.2  122.1 Analysis Plot     
     20251018 221313  SSMISF17   14.5  122.5   N/A   N/A     N/A     N/A      N/A   35.0  14.6  121.5 Analysis Plot     
     20251018 231125  SSMISF16   14.6  122.3   N/A   N/A     N/A     N/A      N/A   40.0  14.8  121.3 Analysis Plot     
     20251019 081101  SSMISF18   16.2  118.9    68   N/A    8.65   -8.65      N/A   35.0  15.2  119.3 Analysis Plot     
     20251019 102225  SSMISF16   15.7  118.3   N/A   N/A     N/A     N/A      N/A   35.0  15.6  118.9 Analysis Plot     
     20251019 164950       GMI   17.0  117.8   101   10%    5.19   -5.19      N/A   30.0  16.8  118.0 Analysis Plot     
     20251019 204534  SSMISF18   17.4  117.1   268   32%    2.41   -2.41      N/A   40.0  17.7  116.8 Analysis Plot     
     20251019 215917  SSMISF17   17.7  116.7   N/A   N/A     N/A     N/A      N/A   40.0  17.8  116.6 Analysis Plot     
     20251019 225644  SSMISF16   17.6  116.7    46    1%    0.80   -0.80      N/A   40.0  17.9  116.5 Analysis Plot     
     20251020 052946     AMSR2   18.5  115.4    34   60%    6.75   -6.75      N/A   45.0  18.4  115.6 Analysis Plot     
     20251021 033708       GMI   17.5  111.4   N/A   N/A     N/A     N/A      N/A   45.0  17.3  112.2 Analysis Plot     
     20251021 061242     AMSR2   17.1  111.3   N/A   N/A     N/A     N/A      N/A   45.0  17.1  111.9 Analysis Plot     
     20251021 113705  SSMISF16   17.9  112.1   N/A   N/A     N/A     N/A      N/A   45.0  16.7  111.0 Analysis Plot     
     20251021 170013       GMI   16.5  110.2   N/A   N/A     N/A     N/A      N/A   45.0  16.7  110.9 Analysis Plot     
     20251021 182436     AMSR2   17.7  111.6   N/A   N/A     N/A     N/A      N/A   50.0  17.2  111.6 Analysis Plot     
     20251021 231137  SSMISF17   17.5  110.9   101   29%    5.40   -5.40      N/A   50.0  17.1  111.3 Analysis Plot     
     20251022 102319  SSMISF17   17.1  109.8   101   N/A    3.72   -3.72      N/A   45.0  17.2  109.8 Analysis Plot     
     20251022 225717  SSMISF17   15.6  108.0   N/A   N/A     N/A     N/A      N/A   35.0  16.1  108.3 Analysis Plot     
     20251022 235714  SSMISF16   15.6  108.2    90   N/A    2.03   -2.03      N/A   25.0  16.0  108.2 Analysis Plot     
     20251023 034605       GMI   14.7  107.0   N/A   N/A     N/A     N/A      N/A   25.0  15.7  108.3 Analysis Plot     
     20251023 060001     AMSR2   15.4  108.0   N/A   N/A     N/A     N/A      N/A   25.0  15.6  108.2 Analysis Plot     
     20251023 085607  SSMISF18   14.9  106.9   N/A   N/A     N/A     N/A      N/A   20.0  15.5  108.0 Analysis Plot     
     20251023 101003  SSMISF17   15.0  107.9   N/A   N/A     N/A     N/A      N/A   20.0  15.4  107.9 Analysis Plot     
     20251023 110846  SSMISF16   14.6  107.4   N/A   N/A     N/A     N/A      N/A   20.0  15.4  107.8 Analysis Plot     
     20251023 181332     AMSR2   15.0  107.0   N/A   N/A     N/A     N/A      N/A   15.0  15.0  107.3 Analysis Plot     
     20251023 213157  SSMISF18   14.7  107.2   N/A   N/A     N/A     N/A      N/A   15.0  14.7  107.2 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.