Tropical Depression 01P

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                 
     20231022 021056     AMSR2  -10.6  167.6   268   21%    0.07   -0.07      N/A   40.0 -10.3  167.6 Analysis Plot     
     20231022 065849  SSMISF17  -11.1  168.1   N/A   N/A     N/A     N/A      N/A   50.0 -11.0  167.9 Analysis Plot     
     20231022 143912     AMSR2  -12.1  168.8   N/A   N/A     N/A     N/A      N/A   55.0 -11.9  168.9 Analysis Plot     
     20231022 164107  SSMISF18  -11.9  168.9    68   53%    4.15    4.15      N/A   55.0 -12.0  168.9 Analysis Plot     
     20231022 183411  SSMISF16  -12.2  169.2   101  100%   38.83   53.83  >65 kts   65.0 -12.1  168.9 Analysis Plot     
     20231023 064448  SSMISF17  -12.9  169.3    46  100%   25.77   40.77  >65 kts   75.0 -13.0  169.3 Analysis Plot     
     20231023 134353     AMSR2  -13.6  169.4    46  100%   40.57   55.57  >65 kts  115.0 -13.7  169.6 Analysis Plot     
     20231023 162820  SSMISF18  -14.0  169.2    46  100%   28.05   43.05  >65 kts  115.0 -13.9  169.5 Analysis Plot     
     20231023 193535       GMI  -14.1  169.1    46  100%   26.02   41.02  >65 kts  115.0 -14.0  169.4 Analysis Plot     
     20231024 015818     AMSR2  -14.6  169.0    46  100%   27.28   42.28  >65 kts  120.0 -14.8  168.8 Analysis Plot     
     20231024 050426  SSMISF18  -14.8  168.9    46  100%   29.09   44.09  >65 kts  120.0 -15.1  168.6 Analysis Plot     
     20231024 065734  SSMISF16  -15.1  168.8   N/A   N/A     N/A     N/A      N/A  115.0 -15.2  168.5 Analysis Plot     
     20231024 142658     AMSR2  -15.7  168.6   N/A   N/A     N/A     N/A      N/A  110.0 -15.9  167.9 Analysis Plot     
     20231024 161607  SSMISF18  -15.9  168.2   N/A   N/A     N/A     N/A      N/A  110.0 -16.0  167.8 Analysis Plot     
     20231024 180826  SSMISF16  -16.3  168.1   N/A   N/A     N/A     N/A      N/A  110.0 -16.1  167.6 Analysis Plot     
     20231024 192247  SSMISF17  -16.3  168.2   101  100%   32.23   47.23  >65 kts  105.0 -16.0  167.6 Analysis Plot     
     20231025 023938     AMSR2  -16.8  167.5    23   95%   14.53   29.53  >65 kts   95.0 -16.5  167.0 Analysis Plot     
     20231025 045046  SSMISF18  -16.4  167.2   N/A   N/A     N/A     N/A      N/A   95.0 -16.6  166.9 Analysis Plot     
     20231025 060805       GMI  -16.9  168.4   N/A   N/A     N/A     N/A      N/A   95.0 -16.6  166.9 Analysis Plot     
     20231025 064319  SSMISF16  -16.6  168.3   N/A   N/A     N/A     N/A      N/A   75.0 -16.7  166.8 Analysis Plot     
     20231025 075814  SSMISF17  -16.4  167.2   N/A   N/A     N/A     N/A      N/A   75.0 -17.3  166.8 Analysis Plot     
     20231025 192437       GMI  -17.2  165.7   N/A   N/A     N/A     N/A      N/A   50.0 -17.9  165.9 Analysis Plot     
     20231026 043736  SSMISF18  -17.4  165.3   N/A   N/A     N/A     N/A      N/A   25.0 -18.0  165.4 Analysis Plot     
     20231026 063006  SSMISF16  -17.8  165.3   N/A   N/A     N/A     N/A      N/A   20.0 -18.2  165.4 Analysis Plot     
     20231026 074301  SSMISF17  -17.8  165.6   N/A   N/A     N/A     N/A      N/A   20.0 -18.3  165.3 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.