Tropical Storm 16P

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                 
     20230301 191400  SSMISF17  -13.8  161.6   N/A   N/A     N/A     N/A      N/A   40.0 -14.1  162.3 Analysis Plot     
     20230302 063249  SSMISF16  -14.9  163.6   190   10%    0.49   -0.49      N/A   50.0 -15.3  163.7 Analysis Plot     
     20230302 074918  SSMISF17  -15.3  163.9    23   19%    5.24    5.24      N/A   60.0 -15.4  163.9 Analysis Plot     
     20230302 074914  SSMISF17  -15.0  164.0   168    4%    1.07    1.07      N/A   60.0 -15.7  164.5 Analysis Plot     
     20230302 190053  SSMISF17  -16.5  165.9    46  100%   24.34   39.34  >65 kts   70.0 -16.6  166.0 Analysis Plot     
     20230303 021657     AMSR2  -17.2  166.9   N/A   N/A     N/A     N/A      N/A   80.0 -17.4  167.1 Analysis Plot     
     20230303 061852  SSMISF16  -17.6  167.8    79   53%   12.60   12.60      N/A   80.0 -17.8  167.5 Analysis Plot     
     20230303 073455  SSMISF17  -17.8  168.0    79  100%   44.63   59.63  >65 kts   85.0 -17.9  167.6 Analysis Plot     
     20230303 173208  SSMISF16  -19.6  169.8    34  100%   52.23   67.23  >85 kts   95.0 -19.7  170.0 Analysis Plot     
     20230303 184800  SSMISF17  -19.9  170.1    34  100%   44.73   59.73  >65 kts  105.0 -19.8  170.2 Analysis Plot     
     20230304 060418  SSMISF16  -22.1  173.3    23  100%   38.76   53.76  >65 kts  130.0 -22.3  173.4 Analysis Plot     
     20230304 071951  SSMISF17  -22.3  173.8    23  100%   24.61   39.61  >65 kts  130.0 -22.6  173.9 Analysis Plot     
     20230304 151951  SSMISF18  -24.5  176.8   N/A   N/A     N/A     N/A      N/A  120.0 -24.4  177.4 Analysis Plot     
     20230304 172013  SSMISF16  -25.4  178.3   N/A   N/A     N/A     N/A      N/A  120.0 -24.8  178.2 Analysis Plot     
     20230304 183559  SSMISF17  -25.2  178.7   301    8%    3.18    3.18      N/A  105.0 -25.1  178.8 Analysis Plot     
     20230305 034847  SSMISF18  -26.6 -178.4   146   14%    6.20    6.20      N/A   90.0 -26.4 -178.4 Analysis Plot     
     20230305 055010  SSMISF16  -26.8 -177.1   190   36%    7.60    7.60      N/A   90.0 -26.7 -177.6 Analysis Plot     
     20230305 150601  SSMISF18  -28.6 -171.4   N/A   N/A     N/A     N/A      N/A   60.0 -27.9 -172.6 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.