Tropical Storm 15W

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                 
     20240916 212856       GMI   17.4  139.1   N/A   N/A     N/A     N/A      N/A   35.0  18.5  139.6 Analysis Plot     
     20240917 034039     AMSR2   21.5  138.0   N/A   N/A     N/A     N/A      N/A   35.0  20.1  136.9 Analysis Plot     
     20240917 105241       GMI   21.6  134.7   N/A   N/A     N/A     N/A      N/A   45.0  21.6  134.7 Analysis Plot     
     20240917 172623     AMSR2   25.6  128.7    12    8%    2.26   -2.26      N/A   50.0  26.5  127.0 Analysis Plot     
     20240918 042446     AMSR2   26.9  127.8   N/A   N/A     N/A     N/A      N/A   50.0  26.5  126.8 Analysis Plot     
     20240918 213708       GMI   29.1  126.7   N/A   N/A     N/A     N/A      N/A   45.0  27.6  126.8 Analysis Plot     
     20240918 220322  SSMISF16   26.6  124.7     5   N/A    0.24   -0.24      N/A   45.0  27.9  126.1 Analysis Plot     
     20240918 223124  SSMISF17   28.5  124.9   N/A   N/A     N/A     N/A      N/A   45.0  28.0  126.0 Analysis Plot     
     20240919 050803     AMSR2   29.9  122.0   N/A   N/A     N/A     N/A      N/A   35.0  30.0  122.4 Analysis Plot     
     20240919 092129  SSMISF16   28.4  123.3   N/A   N/A     N/A     N/A      N/A   35.0  30.0  122.3 Analysis Plot     
     20240919 110536       GMI   29.7  121.5   N/A   N/A     N/A     N/A      N/A   35.0  30.1  122.1 Analysis Plot     
     20240919 193503  SSMISF18   32.5  122.6   N/A   N/A     N/A     N/A      N/A   30.0  31.1  121.2 Analysis Plot     
     20240919 205355       GMI   29.6  121.0   N/A   N/A     N/A     N/A      N/A   30.0  31.2  121.2 Analysis Plot     
     20240919 215029  SSMISF16   32.4  120.8   N/A   N/A     N/A     N/A      N/A   30.0  31.4  121.1 Analysis Plot     
     20240919 221629  SSMISF17   32.7  120.4   N/A   N/A     N/A     N/A      N/A   30.0  31.5  121.0 Analysis Plot     
     20240919 221627  SSMISF18   32.7  120.3   N/A   N/A     N/A     N/A      N/A   30.0  31.6  121.0 Analysis Plot     
     20240920 065510  SSMISF18   32.8  121.5   N/A   N/A     N/A     N/A      N/A   30.0  32.7  120.7 Analysis Plot     
     20240920 093655  SSMISF17   33.2  119.5   N/A   N/A     N/A     N/A      N/A   30.0  33.0  121.3 Analysis Plot     
     20240920 175522     AMSR2   33.5  122.1   N/A   N/A     N/A     N/A      N/A   30.0  33.6  123.2 Analysis Plot     
     20240920 220150  SSMISF17   33.9  124.6   290   18%    0.54   -0.54      N/A   30.0  34.0  124.3 Analysis Plot     
     20240921 045654     AMSR2   33.0  124.7   N/A   N/A     N/A     N/A      N/A   30.0  34.2  125.5 Analysis Plot     
     20240921 064113  SSMISF18   34.0  127.7   N/A   N/A     N/A     N/A      N/A   30.0  34.2  125.7 Analysis Plot     
     20240921 092316  SSMISF17   33.4  129.7   N/A   N/A     N/A     N/A      N/A   30.0  35.0  128.3 Analysis Plot     
     20240921 192909       GMI   35.0  132.6   N/A   N/A     N/A     N/A      N/A   35.0  35.6  133.6 Analysis Plot     
     20240921 214644  SSMISF17   35.7  135.2   223    4%    1.35   -1.35      N/A   35.0  36.1  135.7 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.