Tropical Storm 26W

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                 
     20241109 093626  SSMISF16   14.6  130.8    12  100%   25.67  -40.67      N/A   30.0  14.6  130.7 Analysis Plot     
     20241109 094042  SSMISF17   14.7  130.9    23   99%   17.96  -32.96      N/A   30.0  14.7  130.2 Analysis Plot     
     20241109 194745  SSMISF18   14.9  127.9    68   49%    6.27    6.27      N/A   55.0  15.1  127.7 Analysis Plot     
     20241109 221611  SSMISF17   14.7  127.4    12   93%    7.76   22.76  >65 kts   55.0  15.2  127.1 Analysis Plot     
     20241110 044019     AMSR2   15.0  125.9    23   19%    7.33    7.33      N/A   60.0  15.3  125.8 Analysis Plot     
     20241110 063655       GMI   15.2  125.6    57    1%    5.99    5.99      N/A   65.0  15.3  125.6 Analysis Plot     
     20241110 065946  SSMISF18   15.4  125.3    57   29%    9.14    9.14      N/A   65.0  15.3  124.9 Analysis Plot     
     20241110 092341  SSMISF16   15.6  124.8    34   36%    0.46    0.46      N/A   65.0  15.5  124.4 Analysis Plot     
     20241110 092713  SSMISF17   15.7  124.8   N/A   N/A     N/A     N/A      N/A   65.0  15.6  124.1 Analysis Plot     
     20241110 195836       GMI   16.2  123.0   N/A   N/A     N/A     N/A      N/A   80.0  16.1  122.9 Analysis Plot     
     20241110 215818  SSMISF16   16.0  122.8    57  100%   31.39   46.39  >65 kts   80.0  16.4  122.3 Analysis Plot     
     20241110 220136  SSMISF17   16.0  122.8    57  100%   29.03   44.03  >65 kts   80.0  16.4  122.2 Analysis Plot     
     20241111 052321     AMSR2   16.8  121.5    46   83%    8.48    8.48      N/A   70.0  17.0  121.2 Analysis Plot     
     20241111 173525     AMSR2   18.1  119.4    90   15%    4.55   -4.55      N/A   50.0  18.6  119.0 Analysis Plot     
     20241112 064550       GMI   19.4  118.2   101   32%    4.35   -4.35      N/A   45.0  19.1  118.0 Analysis Plot     
     20241112 081416  SSMISF18   19.8  118.2   123   28%    9.38   -9.38      N/A   45.0  19.3  117.7 Analysis Plot     
     20241112 104230  SSMISF17   20.1  118.4   N/A   N/A     N/A     N/A      N/A   45.0  19.4  117.5 Analysis Plot     
     20241112 181815     AMSR2   20.1  116.7    90   N/A    3.60   -3.60      N/A   45.0  20.1  116.9 Analysis Plot     
     20241112 204700  SSMISF18   19.9  116.7   101    3%    4.44   -4.44      N/A   45.0  20.1  116.7 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.