Tropical Depression 14S

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                 
     20230222 112129  SSMISF18  -14.9   73.9   N/A   N/A     N/A     N/A      N/A   35.0 -14.9   73.5 Analysis Plot     
     20230222 223345  SSMISF18  -16.8   72.5   N/A   N/A     N/A     N/A      N/A   50.0 -16.7   72.6 Analysis Plot     
     20230223 003611  SSMISF16  -17.1   72.4    12   46%    4.70   -4.70      N/A   50.0 -17.0   72.4 Analysis Plot     
     20230223 015635  SSMISF17  -17.0   72.3    46  100%   35.63  -50.63      N/A   50.0 -17.2   72.3 Analysis Plot     
     20230223 110759  SSMISF18  -18.4   71.3    23   86%   14.53   29.53  >65 kts   55.0 -18.2   71.5 Analysis Plot     
     20230223 131042  SSMISF16  -18.8   71.5    12   82%    4.40    4.40      N/A   55.0 -18.6   71.2 Analysis Plot     
     20230224 002336  SSMISF16  -21.0   70.8   123  100%   44.40   59.40  >65 kts   75.0 -20.4   70.3 Analysis Plot     
     20230224 014300  SSMISF17  -21.3   70.9    90  100%   34.83   49.83  >65 kts   75.0 -20.5   70.2 Analysis Plot     
     20230224 125543  SSMISF16  -23.7   69.8   N/A   N/A     N/A     N/A      N/A   75.0 -22.8   69.6 Analysis Plot     
     20230224 141441  SSMISF17  -23.9   70.0   N/A   N/A     N/A     N/A      N/A   75.0 -23.0   69.5 Analysis Plot     
     20230225 001148  SSMISF16  -25.0   68.8   N/A   N/A     N/A     N/A      N/A   55.0 -24.4   68.8 Analysis Plot     
     20230225 013031  SSMISF17  -25.3   68.8   N/A   N/A     N/A     N/A      N/A   55.0 -24.5   68.7 Analysis Plot     
     20230225 124203  SSMISF16  -26.6   68.2    34   17%    6.22   -6.22      N/A   50.0 -25.9   68.2 Analysis Plot     
     20230225 140023  SSMISF17  -27.4   68.2   N/A   N/A     N/A     N/A      N/A   50.0 -26.1   68.1 Analysis Plot     
     20230225 233848  SSMISF18  -28.0   67.8    23   39%    3.74   -3.74      N/A   45.0 -26.9   67.4 Analysis Plot     
     20230226 000008  SSMISF16  -27.9   67.5    23   47%    5.61   -5.61      N/A   45.0 -27.0   67.4 Analysis Plot     
     20230226 011815  SSMISF17  -28.3   67.5   N/A   N/A     N/A     N/A      N/A   45.0 -27.1   67.3 Analysis Plot     
     20230226 120712  SSMISF18  -28.4   67.0   157   N/A    7.25   -7.25      N/A   40.0 -28.2   67.2 Analysis Plot     
     20230226 134659  SSMISF17  -28.4   67.0   223    4%    7.96   -7.96      N/A   35.0 -28.3   67.2 Analysis Plot     
     20230226 232553  SSMISF18  -29.1   66.9   123   25%    4.24   -4.24      N/A   45.0 -29.2   66.5 Analysis Plot     
     20230227 010615  SSMISF17  -29.1   66.7   N/A   N/A     N/A     N/A      N/A   40.0 -29.2   66.5 Analysis Plot     
     20230227 115345  SSMISF18  -29.0   67.6   N/A   N/A     N/A     N/A      N/A   40.0 -29.0   67.2 Analysis Plot     
     20230228 114116  SSMISF18  -26.9   68.0   N/A   N/A     N/A     N/A      N/A   40.0 -27.2   68.0 Analysis Plot     
     20230228 225856  SSMISF18  -26.5   68.1   N/A   N/A     N/A     N/A      N/A   35.0 -26.4   67.7 Analysis Plot     
     20230301 112838  SSMISF18  -26.2   67.8   N/A   N/A     N/A     N/A      N/A   25.0 -26.1   67.3 Analysis Plot     
     20230301 133052  SSMISF16  -26.3   67.8   N/A   N/A     N/A     N/A      N/A   25.0 -26.2   67.1 Analysis Plot     
     20230301 144807  SSMISF17  -26.3   68.1   N/A   N/A     N/A     N/A      N/A   25.0 -26.3   67.1 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.