Tropical Depression 01W

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                 
     20250610 181237       GMI   14.1  114.3   N/A   N/A     N/A     N/A      N/A   25.0  15.2  113.3 Analysis Plot     
     20250610 223725  SSMISF16   16.1  114.0   112   N/A    2.40   -2.40      N/A   30.0  16.4  113.4 Analysis Plot     
     20250611 081553  SSMISF18   17.0  112.2   N/A   N/A     N/A     N/A      N/A   30.0  16.8  112.2 Analysis Plot     
     20250611 205057  SSMISF18   15.6  111.2   N/A   N/A     N/A     N/A      N/A   40.0  16.6  110.5 Analysis Plot     
     20250612 065147       GMI   17.3  109.9   N/A   N/A     N/A     N/A      N/A   50.0  17.5  109.8 Analysis Plot     
     20250613 062621     AMSR2   18.7  108.3    34   32%   12.51   12.51      N/A   60.0  19.0  108.4 Analysis Plot     
     20250613 110238  SSMISF16   18.9  108.3    57   N/A    1.76   -1.76      N/A   50.0  19.2  108.6 Analysis Plot     
     20250613 173842       GMI   19.5  108.8   246   18%    3.52    3.52      N/A   60.0  19.4  108.5 Analysis Plot     
     20250613 183656     AMSR2   19.8  108.7    12   33%    4.24    4.24      N/A   55.0  20.0  109.2 Analysis Plot     
     20250613 202332  SSMISF18   19.9  108.6   N/A   N/A     N/A     N/A      N/A   55.0  20.2  109.3 Analysis Plot     
     20250614 053236     AMSR2   21.2  109.9    12  100%   26.03   41.03  >65 kts   65.0  21.4  109.8 Analysis Plot     
     20250614 104925  SSMISF16   22.2  110.1    68   56%    6.45    6.45      N/A   55.0  22.0  110.6 Analysis Plot     
     20250614 104944  SSMISF16   22.2  110.1    68   58%    6.21    6.21      N/A   55.0  22.4  110.9 Analysis Plot     
     20250614 165512       GMI   23.1  111.0   N/A   N/A     N/A     N/A      N/A   50.0  23.0  111.6 Analysis Plot     
     20250614 232415  SSMISF17   25.9  111.5   N/A   N/A     N/A     N/A      N/A   35.0  24.3  112.8 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.