Tropical Storm 04L

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                 
     20250804 042054       GMI   33.8  -69.1   123   15%    1.40   -1.40      N/A   40.0  34.5  -69.1 Analysis Plot     
     20250804 063508     AMSR2   34.9  -68.4    90    1%    1.77   -1.77      N/A   40.0  34.8  -68.0 Analysis Plot     
     20250804 113158  SSMISF16   35.3  -65.8   N/A   N/A     N/A     N/A      N/A   40.0  35.0  -67.6 Analysis Plot     
     20250804 173724     AMSR2   35.2  -67.2   168    8%    1.10   -1.10      N/A   40.0  35.5  -66.7 Analysis Plot     
     20250804 223330  SSMISF17   35.3  -64.8   N/A   N/A     N/A     N/A      N/A   40.0  36.3  -65.9 Analysis Plot     
     20250805 054027     AMSR2   37.0  -64.8   N/A   N/A     N/A     N/A      N/A   35.0  37.3  -64.4 Analysis Plot     
     20250805 164408     AMSR2   38.0  -62.7   N/A   N/A     N/A     N/A      N/A   35.0  38.2  -63.0 Analysis Plot     
     20250805 191327  SSMISF18   37.9  -62.0   190   12%    0.01   -0.01      N/A   35.0  38.4  -62.7 Analysis Plot     
     20250805 191323  SSMISF18   37.6  -61.6   N/A   N/A     N/A     N/A      N/A   35.0  38.6  -62.2 Analysis Plot     
     20250805 222011  SSMISF17   38.6  -62.0   N/A   N/A     N/A     N/A      N/A   35.0  38.8  -61.9 Analysis Plot     
     20250806 025815       GMI   38.7  -61.8   N/A   N/A     N/A     N/A      N/A   35.0  38.9  -61.3 Analysis Plot     
     20250806 062138     AMSR2   39.4  -60.2    57   21%    4.42   -4.42      N/A   40.0  39.3  -60.1 Analysis Plot     
     20250806 124241       GMI   39.6  -59.3   N/A   N/A     N/A     N/A      N/A   40.0  39.6  -59.1 Analysis Plot     
     20250806 172703     AMSR2   39.8  -57.1   N/A   N/A     N/A     N/A      N/A   45.0  40.1  -57.2 Analysis Plot     
     20250806 185907  SSMISF18   39.8  -56.8   157    4%    3.96   -3.96      N/A   45.0  40.0  -56.3 Analysis Plot     
     20250806 222849  SSMISF16   40.1  -55.9   N/A   N/A     N/A     N/A      N/A   45.0  40.1  -55.8 Analysis Plot     
     20250806 222910  SSMISF16   40.0  -55.6   N/A   N/A     N/A     N/A      N/A   45.0  40.2  -55.2 Analysis Plot     
     20250807 052538     AMSR2   40.6  -53.1   N/A   N/A     N/A     N/A      N/A   45.0  40.6  -52.5 Analysis Plot     
     20250807 072102  SSMISF18   40.0  -52.9   N/A   N/A     N/A     N/A      N/A   45.0  40.6  -52.1 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.