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                 
     20260114 170639     AMSR2    9.1  130.1   N/A   N/A     N/A     N/A      N/A   25.0   9.8  130.1 Analysis Plot     
     20260114 213123  SSMISF17   10.1  130.7   157   N/A    0.13   -0.13      N/A   25.0   9.8  130.0 Analysis Plot     
     20260115 144507       GMI   10.3  128.9   135   N/A    1.77   -1.77      N/A   30.0  10.5  128.5 Analysis Plot     
     20260116 043858     AMSR2    9.5  126.6   N/A   N/A     N/A     N/A      N/A   30.0  10.9  127.8 Analysis Plot     
     20260116 165420     AMSR2   12.5  126.8   N/A   N/A     N/A     N/A      N/A   40.0  12.7  126.3 Analysis Plot     
     20260117 013457       GMI   13.9  124.5    34  100%   13.65  -28.65      N/A   45.0  13.5  125.0 Analysis Plot     
     20260117 052250     AMSR2   13.8  126.0   N/A   N/A     N/A     N/A      N/A   50.0  14.2  124.5 Analysis Plot     
     20260117 173605     AMSR2   15.5  125.4   N/A   N/A     N/A     N/A      N/A   45.0  15.5  124.1 Analysis Plot     
     20260117 194757  SSMISF18   13.9  125.5    12   N/A    2.01   -2.01      N/A   45.0  14.4  125.1 Analysis Plot     
     20260118 221417  SSMISF17   16.1  126.8   168   11%    1.96   -1.96      N/A   30.0  16.5  126.1 Analysis Plot     
     20260119 051117     AMSR2   16.5  127.1   101   10%    1.39   -1.39      N/A   35.0  17.0  127.2 Analysis Plot     
     20260119 092508  SSMISF17   16.9  127.5    23   N/A    0.64   -0.64      N/A   35.0  16.9  127.4 Analysis Plot     
     20260119 133144       GMI   16.8  127.6   N/A   N/A     N/A     N/A      N/A   30.0  17.0  127.6 Analysis Plot     
     20260119 172317     AMSR2   17.2  128.2   190    6%    0.41   -0.41      N/A   30.0  17.3  128.0 Analysis Plot     
     20260119 191930  SSMISF18   17.0  128.5   312    6%    0.66   -0.66      N/A   30.0  17.0  128.4 Analysis Plot     
     20260119 215931  SSMISF17   17.0  129.3   N/A   N/A     N/A     N/A      N/A   30.0  17.0  128.8 Analysis Plot     
     20260120 041652     AMSR2   17.3  129.9   N/A   N/A     N/A     N/A      N/A   35.0  17.3  129.9 Analysis Plot     
     20260120 162838     AMSR2   17.2  131.9   N/A   N/A     N/A     N/A      N/A   30.0  16.1  133.5 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.