Tropical Storm 13W

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                 
     20240904 052704  SSMISF18   28.1  146.1   N/A   N/A     N/A     N/A      N/A   30.0  28.5  146.8 Analysis Plot     
     20240904 073952  SSMISF16   28.6  146.4   223    7%    1.10   -1.10      N/A   30.0  28.8  146.7 Analysis Plot     
     20240904 081432  SSMISF17   28.7  146.5   N/A   N/A     N/A     N/A      N/A   30.0  29.2  146.9 Analysis Plot     
     20240904 134312       GMI   29.8  146.6   N/A   N/A     N/A     N/A      N/A   30.0  29.9  146.7 Analysis Plot     
     20240904 161651     AMSR2   30.8  146.5    57    1%    1.19   -1.19      N/A   30.0  30.8  146.5 Analysis Plot     
     20240904 175511  SSMISF18   31.0  146.5    90   N/A    2.12   -2.12      N/A   30.0  30.9  146.5 Analysis Plot     
     20240904 204105  SSMISF17   31.8  146.4   235   22%    3.75   -3.75      N/A   25.0  32.0  146.5 Analysis Plot     
     20240904 233053       GMI   32.3  146.1   112   N/A    1.67   -1.67      N/A   25.0  32.3  146.5 Analysis Plot     
     20240905 031734     AMSR2   32.9  145.9   179   19%    6.19   -6.19      N/A   25.0  33.2  146.2 Analysis Plot     
     20240905 051524  SSMISF18   33.1  145.3   135   10%    4.44   -4.44      N/A   35.0  33.3  146.2 Analysis Plot     
     20240905 072848  SSMISF16   33.5  145.5   123    8%    2.29   -2.29      N/A   30.0  33.9  146.3 Analysis Plot     
     20240905 080154  SSMISF17   33.9  145.7   179    4%    3.15   -3.15      N/A   30.0  33.7  146.0 Analysis Plot     
     20240905 202623  SSMISF17   34.8  147.7   N/A   N/A     N/A     N/A      N/A   35.0  35.8  147.8 Analysis Plot     
     20240906 050220  SSMISF18   36.6  149.3   N/A   N/A     N/A     N/A      N/A   30.0  37.0  149.7 Analysis Plot     
     20240906 071548  SSMISF16   37.2  150.0   168   N/A    4.11   -4.11      N/A   35.0  37.3  150.1 Analysis Plot     
     20240906 074855  SSMISF17   37.5  150.4   146   N/A    2.49   -2.49      N/A   35.0  37.6  150.6 Analysis Plot     
     20240906 135622       GMI   38.5  151.7   290   N/A    1.22   -1.22      N/A   35.0  38.5  151.9 Analysis Plot     
     20240906 160211     AMSR2   38.8  152.5   223   N/A    2.04   -2.04      N/A   35.0  39.3  153.1 Analysis Plot     
     20240906 193859  SSMISF16   39.4  153.7   N/A   N/A     N/A     N/A      N/A   35.0  39.9  154.6 Analysis Plot     
     20240906 201050  SSMISF17   40.0  154.6   135    1%    3.12   -3.12      N/A   35.0  40.0  154.8 Analysis Plot     
     20240906 220459       GMI   40.0  154.9   N/A   N/A     N/A     N/A      N/A   35.0  40.3  155.2 Analysis Plot     
     20240907 044912  SSMISF18   41.8  157.6   235   N/A    4.48   -4.48      N/A   35.0  41.8  157.7 Analysis Plot     
     20240907 070301  SSMISF16   42.1  158.6   N/A   N/A     N/A     N/A      N/A   35.0  42.4  158.7 Analysis Plot     
     20240907 073654  SSMISF17   42.3  159.2   N/A   N/A     N/A     N/A      N/A   35.0  42.8  159.4 Analysis Plot     
     20240907 131603       GMI   43.9  162.2   N/A   N/A     N/A     N/A      N/A   35.0  44.1  161.7 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.