Tropical Depression 02A

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                 
     20240830 013202  SSMISF17   24.7   68.6   N/A   N/A     N/A     N/A      N/A   35.0  23.5   68.1 Analysis Plot     
     20240830 065010       GMI   23.8   67.6   N/A   N/A     N/A     N/A      N/A   35.0  23.6   67.6 Analysis Plot     
     20240830 084815     AMSR2   24.0   67.1   N/A   N/A     N/A     N/A      N/A   35.0  23.5   67.0 Analysis Plot     
     20240830 113950  SSMISF18   23.8   66.7   223    1%    2.61   -2.61      N/A   35.0  23.6   66.8 Analysis Plot     
     20240830 135234  SSMISF16   23.6   66.5   246    3%    0.94   -0.94      N/A   35.0  23.9   66.5 Analysis Plot     
     20240830 201455       GMI   23.0   66.0   N/A   N/A     N/A     N/A      N/A   40.0  23.4   66.1 Analysis Plot     
     20240831 001001  SSMISF18   23.3   65.4   146   N/A    4.49   -4.49      N/A   40.0  23.4   65.4 Analysis Plot     
     20240831 022243  SSMISF16   23.4   65.3    68    1%    1.21   -1.21      N/A   40.0  23.6   65.2 Analysis Plot     
     20240831 093241     AMSR2   23.9   64.1   N/A   N/A     N/A     N/A      N/A   40.0  23.3   64.3 Analysis Plot     
     20240831 112525  SSMISF18   23.9   63.6   N/A   N/A     N/A     N/A      N/A   40.0  23.3   64.1 Analysis Plot     
     20240831 133807  SSMISF16   23.7   63.5   N/A   N/A     N/A     N/A      N/A   40.0  23.2   63.9 Analysis Plot     
     20240831 141528  SSMISF17   23.7   63.5    34   N/A    3.98   -3.98      N/A   45.0  23.2   63.8 Analysis Plot     
     20240831 214015     AMSR2   23.4   62.3    79   10%    5.66   -5.66      N/A   45.0  23.1   62.6 Analysis Plot     
     20240831 235619  SSMISF18   22.8   62.7   235    6%    3.09   -3.09      N/A   45.0  23.1   62.5 Analysis Plot     
     20240901 024542  SSMISF17   22.6   62.6   212    1%    2.80   -2.80      N/A   40.0  22.7   62.4 Analysis Plot     
     20240901 065939       GMI   22.5   62.1   N/A   N/A     N/A     N/A      N/A   40.0  22.5   62.1 Analysis Plot     
     20240901 111211  SSMISF18   22.2   61.5   N/A   N/A     N/A     N/A      N/A   35.0  22.2   61.5 Analysis Plot     
     20240901 132457  SSMISF16   22.0   61.7   168   N/A    1.87   -1.87      N/A   35.0  22.1   61.5 Analysis Plot     
     20240901 140003  SSMISF17   21.9   61.7   279   N/A    2.93   -2.93      N/A   35.0  21.9   61.7 Analysis Plot     
     20240901 202502       GMI   21.4   61.4   N/A   N/A     N/A     N/A      N/A   25.0  21.5   61.5 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.