Tropical Depression 09W

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                 
     20240813 031023     AMSR2   27.4  150.5   N/A   N/A     N/A     N/A      N/A   25.0  27.3  150.2 Analysis Plot     
     20240813 052135  SSMISF18   26.1  151.1   N/A   N/A     N/A     N/A      N/A   25.0  27.5  150.2 Analysis Plot     
     20240813 061151       GMI   27.8  150.4   N/A   N/A     N/A     N/A      N/A   25.0  27.5  150.2 Analysis Plot     
     20240813 073225  SSMISF16   28.6  150.0   N/A   N/A     N/A     N/A      N/A   25.0  28.2  150.1 Analysis Plot     
     20240813 081700  SSMISF17   28.3  150.0   290    6%    1.92   -1.92      N/A   25.0  28.3  150.0 Analysis Plot     
     20240813 200105  SSMISF16   28.6  148.9   N/A   N/A     N/A     N/A      N/A   30.0  28.6  148.9 Analysis Plot     
     20240813 204421  SSMISF17   28.9  148.9   290    1%    1.59   -1.59      N/A   30.0  28.9  148.9 Analysis Plot     
     20240814 051013  SSMISF18   30.0  148.3   N/A   N/A     N/A     N/A      N/A   30.0  30.2  148.2 Analysis Plot     
     20240814 072035  SSMISF16   30.8  147.8   N/A   N/A     N/A     N/A      N/A   30.0  31.0  148.0 Analysis Plot     
     20240814 080343  SSMISF17   31.3  147.6   N/A   N/A     N/A     N/A      N/A   30.0  31.5  147.8 Analysis Plot     
     20240814 155825     AMSR2   33.5  147.0     5   N/A    0.58   -0.58      N/A   30.0  33.4  147.4 Analysis Plot     
     20240814 203446       GMI   34.9  146.9    68   N/A    0.24   -0.24      N/A   25.0  35.1  147.1 Analysis Plot     
     20240815 030102     AMSR2   36.6  147.2   179    3%    0.58   -0.58      N/A   20.0  37.1  147.2 Analysis Plot     
     20240815 045909  SSMISF18   37.6  149.3   N/A   N/A     N/A     N/A      N/A   20.0  37.3  147.3 Analysis Plot     
     20240815 070914  SSMISF16   37.9  147.8   223   N/A    2.00   -2.00      N/A   20.0  38.0  147.8 Analysis Plot     
     20240815 075143  SSMISF17   38.2  148.3   223   N/A    1.90   -1.90      N/A   20.0  38.4  148.2 Analysis Plot     
     20240815 164048     AMSR2   39.2  148.0   157    1%    0.99   -0.99      N/A   20.0  38.8  148.6 Analysis Plot     
     20240815 195431       GMI   40.2  151.9    34    8%    3.20   -3.20      N/A   20.0  40.3  151.6 Analysis Plot     
     20240815 201330  SSMISF17   39.8  152.9   N/A   N/A     N/A     N/A      N/A   20.0  40.5  152.3 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.