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                 
     20230622 080840  SSMISF16   10.8  -41.0   N/A   N/A     N/A     N/A      N/A   30.0  10.9  -41.2 Analysis Plot     
     20230622 162914     AMSR2   11.5  -43.2   146   14%    1.06   -1.06      N/A   30.0  11.5  -43.4 Analysis Plot     
     20230622 190502  SSMISF18   11.8  -43.7    90   N/A    1.34   -1.34      N/A   30.0  11.6  -43.8 Analysis Plot     
     20230622 212607  SSMISF17   12.0  -43.9   168   14%    3.28   -3.28      N/A   30.0  11.6  -44.2 Analysis Plot     
     20230623 044421     AMSR2   11.6  -45.9    68   14%    4.88   -4.88      N/A   35.0  11.9  -45.9 Analysis Plot     
     20230623 074315  SSMISF18   11.9  -46.6   N/A   N/A     N/A     N/A      N/A   40.0  12.1  -46.9 Analysis Plot     
     20230623 100353  SSMISF17   11.4  -47.0   N/A   N/A     N/A     N/A      N/A   40.0  12.3  -47.4 Analysis Plot     
     20230623 185210  SSMISF18   12.7  -49.3    46    8%    1.12   -1.12      N/A   45.0  12.9  -48.8 Analysis Plot     
     20230623 204540       GMI   13.2  -49.3   N/A   N/A     N/A     N/A      N/A   45.0  13.1  -49.1 Analysis Plot     
     20230623 204629  SSMISF16   12.6  -49.5    34   10%   15.04  -15.04      N/A   45.0  13.3  -49.3 Analysis Plot     
     20230623 211344  SSMISF17   13.4  -49.5   N/A   N/A     N/A     N/A      N/A   45.0  13.4  -49.4 Analysis Plot     
     20230624 052712     AMSR2   14.5  -51.2   146   35%    4.81   -4.81      N/A   45.0  14.5  -51.3 Analysis Plot     
     20230624 072821  SSMISF18   14.8  -51.8   190   18%    4.35   -4.35      N/A   50.0  14.6  -51.2 Analysis Plot     
     20230624 100057       GMI   15.0  -51.6   N/A   N/A     N/A     N/A      N/A   50.0  14.8  -51.4 Analysis Plot     
     20230624 203502  SSMISF16   17.3  -54.8   157   14%    2.86   -2.86      N/A   50.0  17.8  -54.7 Analysis Plot     
     20230624 203512  SSMISF16   17.5  -54.6   N/A   N/A     N/A     N/A      N/A   50.0  18.1  -55.0 Analysis Plot     
     20230625 090827  SSMISF16   21.1  -57.1   N/A   N/A     N/A     N/A      N/A   45.0  20.6  -57.5 Analysis Plot     
     20230625 170306     AMSR2   21.4  -58.3   212   12%    2.14   -2.14      N/A   40.0  21.4  -58.5 Analysis Plot     
     20230625 201049  SSMISF18   22.2  -58.8   N/A   N/A     N/A     N/A      N/A   40.0  21.7  -58.8 Analysis Plot     
     20230625 203148       GMI   22.8  -59.1   N/A   N/A     N/A     N/A      N/A   40.0  21.8  -58.9 Analysis Plot     
     20230625 223021  SSMISF17   22.6  -59.3   N/A   N/A     N/A     N/A      N/A   40.0  22.2  -59.3 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.