Typhoon 27P

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                 
     20260317 031825     AMSR2  -12.6  156.7    34   72%   12.84  -12.84      N/A   40.0 -12.1  156.0 Analysis Plot     
     20260317 074108       GMI  -12.5  155.8    34   44%    6.97   -6.97      N/A   50.0 -12.1  155.6 Analysis Plot     
     20260317 174510  SSMISF18  -12.3  154.0    34   65%   10.62   10.62      N/A   60.0 -12.4  154.1 Analysis Plot     
     20260318 062159  SSMISF18  -12.5  151.8    34  100%   41.02   56.02  >65 kts   65.0 -12.4  151.7 Analysis Plot     
     20260318 183107       GMI  -13.2  149.2    23  100%   39.15   54.15  >65 kts   90.0 -13.2  149.1 Analysis Plot     
     20260318 200413  SSMISF17  -13.6  148.9    23  100%   51.52   66.52  >85 kts  100.0 -13.3  148.5 Analysis Plot     
     20260318 203615  SSMISF16  -13.5  148.5    12  100%   46.04   61.04  >85 kts  100.0 -13.4  148.3 Analysis Plot     
     20260319 060815  SSMISF18  -13.4  146.2    23  100%   52.52   67.52  >85 kts  115.0 -13.6  146.5 Analysis Plot     
     20260319 084024  SSMISF17  -13.4  146.2    23  100%   47.58   62.58  >85 kts  125.0 -13.6  145.6 Analysis Plot     
     20260319 153503     AMSR2  -13.6  144.7    46  100%   60.82   75.82  >85 kts  125.0 -13.6  144.5 Analysis Plot     
     20260319 195057  SSMISF17  -13.6  143.6    34  100%   48.24   63.24  >85 kts  120.0 -13.8  143.5 Analysis Plot     
     20260320 070804       GMI  -13.4  141.8   N/A   N/A     N/A     N/A      N/A  100.0 -13.4  141.8 Analysis Plot     
     20260320 161759     AMSR2  -12.9  140.1    79   43%    4.17    4.17      N/A   75.0 -13.4  139.8 Analysis Plot     
     20260320 184107       GMI  -12.9  139.6   101  100%   26.40   41.40  >65 kts   75.0 -13.4  139.7 Analysis Plot     
     20260320 184422  SSMISF18  -13.1  139.4   101  100%   27.65   42.65  >65 kts   75.0 -13.3  139.3 Analysis Plot     
     20260321 043222     AMSR2  -13.0  138.0    90  100%   34.66   49.66  >65 kts   70.0 -12.9  137.7 Analysis Plot     
     20260321 072041  SSMISF18  -12.9  137.6   101  100%   34.11   49.11  >65 kts   80.0 -13.1  137.5 Analysis Plot     
     20260321 183130  SSMISF18  -13.1  135.4   N/A   N/A     N/A     N/A      N/A   75.0 -13.4  135.3 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.