Tropical Storm 15P

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                 
     20230227 051110  SSMISF18  -13.0  171.4   N/A   N/A     N/A     N/A      N/A   35.0 -13.0  170.4 Analysis Plot     
     20230227 053240  SSMISF16  -11.4  170.0   N/A   N/A     N/A     N/A      N/A   35.0 -13.0  170.3 Analysis Plot     
     20230227 064954  SSMISF17  -11.9  168.6   N/A   N/A     N/A     N/A      N/A   40.0 -13.1  170.1 Analysis Plot     
     20230227 162109  SSMISF18  -12.6  168.4   N/A   N/A     N/A     N/A      N/A   45.0 -14.2  169.1 Analysis Plot     
     20230228 045703  SSMISF18  -13.8  168.8   N/A   N/A     N/A     N/A      N/A   55.0 -14.7  168.2 Analysis Plot     
     20230228 160925  SSMISF18  -16.7  168.1    34  100%   32.44   47.44  >65 kts   75.0 -16.5  168.5 Analysis Plot     
     20230228 181106  SSMISF16  -17.0  168.3    34  100%   51.49   66.49  >85 kts   85.0 -17.0  168.6 Analysis Plot     
     20230228 192847  SSMISF17  -17.3  168.4    34  100%   63.63   78.63  >85 kts   85.0 -17.5  168.2 Analysis Plot     
     20230301 044257  SSMISF18  -18.9  169.1   N/A   N/A     N/A     N/A      N/A   95.0 -19.1  169.1 Analysis Plot     
     20230301 155728  SSMISF18  -21.0  171.5   N/A   N/A     N/A     N/A      N/A  110.0 -21.2  171.0 Analysis Plot     
     20230301 175915  SSMISF16  -21.4  172.2    12   N/A    1.47    1.47      N/A  110.0 -21.6  171.4 Analysis Plot     
     20230301 191639  SSMISF17  -22.0  172.3   N/A   N/A     N/A     N/A      N/A  100.0 -21.5  171.8 Analysis Plot     
     20230302 042843  SSMISF18  -23.2  173.7   N/A   N/A     N/A     N/A      N/A   90.0 -23.2  173.2 Analysis Plot     
     20230302 063133  SSMISF16  -23.8  173.9   N/A   N/A     N/A     N/A      N/A   90.0 -23.5  173.5 Analysis Plot     
     20230302 154450  SSMISF18  -24.9  176.2    23   61%    0.54    0.54      N/A   80.0 -24.9  175.9 Analysis Plot     
     20230303 041436  SSMISF18  -26.4  179.8   N/A   N/A     N/A     N/A      N/A   75.0 -26.0  178.7 Analysis Plot     
     20230303 153203  SSMISF18  -27.4 -175.0   N/A   N/A     N/A     N/A      N/A   55.0 -27.4 -175.1 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.