Tropical Storm 12P

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                 
     20230208 034802     AMSR2  -15.8  152.9    79   25%    1.41   -1.41      N/A   35.0 -15.9  153.2 Analysis Plot     
     20230208 055906  SSMISF18  -15.9  152.7    79   15%    7.99   -7.99      N/A   35.0 -16.0  153.2 Analysis Plot     
     20230208 104246       GMI  -16.2  152.7   N/A   N/A     N/A     N/A      N/A   45.0 -16.5  152.8 Analysis Plot     
     20230208 144130     AMSR2  -16.4  153.5   N/A   N/A     N/A     N/A      N/A   50.0 -17.4  152.9 Analysis Plot     
     20230208 181021  SSMISF18  -16.8  153.5   N/A   N/A     N/A     N/A      N/A   50.0 -17.6  153.0 Analysis Plot     
     20230208 200738  SSMISF16  -17.1  153.1    68   19%    2.17   -2.17      N/A   50.0 -17.8  153.1 Analysis Plot     
     20230208 235901       GMI  -18.1  153.3    12   25%   12.87  -12.87      N/A   50.0 -17.8  153.4 Analysis Plot     
     20230209 054503  SSMISF18  -18.7  153.7    90   25%    1.65    1.65      N/A   60.0 -19.1  154.0 Analysis Plot     
     20230209 072744  SSMISF18  -18.6  153.4   135   19%    1.41    1.41      N/A   65.0 -19.1  154.2 Analysis Plot     
     20230209 152439     AMSR2  -20.1  155.8    57   44%    2.16    2.16      N/A   70.0 -20.5  156.1 Analysis Plot     
     20230209 175727  SSMISF18  -20.3  156.7   N/A   N/A     N/A     N/A      N/A   70.0 -20.6  156.4 Analysis Plot     
     20230209 195326  SSMISF16  -21.0  156.8    79   21%    7.51    7.51      N/A   75.0 -21.1  156.7 Analysis Plot     
     20230210 033346     AMSR2  -23.2  159.3   135   42%    3.37    3.37      N/A   80.0 -23.4  159.2 Analysis Plot     
     20230210 053232  SSMISF18  -23.4  159.6   201   58%   16.54   16.54      N/A   80.0 -23.5  159.4 Analysis Plot     
     20230210 142940     AMSR2  -25.4  163.6   N/A   N/A     N/A     N/A      N/A   75.0 -25.7  163.7 Analysis Plot     
     20230210 174423  SSMISF18  -26.3  164.1   246   26%    4.52    4.52      N/A   75.0 -26.2  164.4 Analysis Plot     
     20230211 023629     AMSR2  -28.3  166.5   N/A   N/A     N/A     N/A      N/A   55.0 -28.5  167.3 Analysis Plot     
     20230211 052131  SSMISF18  -28.1  166.9   N/A   N/A     N/A     N/A      N/A   55.0 -28.5  168.2 Analysis Plot     
     20230211 073158  SSMISF17  -28.2  167.1   N/A   N/A     N/A     N/A      N/A   55.0 -28.8  168.7 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.