Typhoon 04W

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                 
     20260409 033004     AMSR2    8.7  152.3     5   N/A    2.98   -2.98      N/A   25.0   8.7  151.9 Analysis Plot     
     20260409 123728       GMI    8.3  151.8    90    7%    0.79   -0.79      N/A   30.0   8.1  151.6 Analysis Plot     
     20260409 154703     AMSR2    8.4  151.5   257   10%    0.60   -0.60      N/A   35.0   8.1  151.3 Analysis Plot     
     20260409 194551  SSMISF17    8.4  151.5   N/A   N/A     N/A     N/A      N/A   35.0   8.4  151.5 Analysis Plot     
     20260409 202957  SSMISF16    8.4  151.4   N/A   N/A     N/A     N/A      N/A   35.0   8.4  151.4 Analysis Plot     
     20260410 001212       GMI    8.5  151.4   N/A   N/A     N/A     N/A      N/A   35.0   8.4  151.4 Analysis Plot     
     20260410 091741  SSMISF16    8.5  151.7   N/A   N/A     N/A     N/A      N/A   45.0   8.2  151.0 Analysis Plot     
     20260410 193245  SSMISF17    8.1  151.4    57   88%   16.00   31.00  >65 kts   60.0   8.1  151.0 Analysis Plot     
     20260411 031743     AMSR2    8.5  151.5    23   56%    7.10    7.10      N/A   75.0   8.8  151.5 Analysis Plot     
     20260411 055011  SSMISF18    8.9  151.5    23  100%   24.17   39.17  >65 kts   75.0   8.9  151.5 Analysis Plot     
     20260411 153411     AMSR2    9.0  151.3    34  100%   52.26   67.26  >85 kts   95.0   9.5  150.6 Analysis Plot     
     20260411 182823  SSMISF18    9.1  151.3    23  100%   49.87   64.87  >85 kts   95.0   9.5  150.6 Analysis Plot     
     20260412 084959  SSMISF16   10.6  150.5    23  100%   60.26   75.26  >85 kts  130.0  10.8  150.1 Analysis Plot     
     20260412 120725       GMI   11.0  150.3    23  100%   60.83   75.83  >85 kts  130.0  10.9  150.0 Analysis Plot     
     20260412 181329  SSMISF18   11.5  149.4    12  100%   55.64   70.64  >85 kts  155.0  11.8  149.4 Analysis Plot     
     20260412 212719  SSMISF16   11.8  149.1    12  100%   61.66   76.66  >85 kts  155.0  12.1  148.8 Analysis Plot     
     20260412 234119       GMI   12.2  148.8    23  100%   63.59   78.59  >85 kts  155.0  12.2  148.8 Analysis Plot     
     20260413 075206  SSMISF17   12.9  147.8    12  100%   53.17   68.17  >85 kts  150.0  12.9  147.8 Analysis Plot     
     20260413 083727  SSMISF16   12.9  147.6    12  100%   51.50   66.50  >85 kts  150.0  13.0  147.7 Analysis Plot     
     20260413 180018  SSMISF18   13.6  146.9    12  100%   36.74   51.74  >65 kts  150.0  13.6  146.9 Analysis Plot     
     20260413 202814  SSMISF17   13.7  146.8   112   93%   14.71   29.71  >65 kts  145.0  14.0  146.7 Analysis Plot     
     20260413 225812       GMI   14.1  146.7    12  100%   36.08   51.08  >65 kts  145.0  14.0  146.7 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.