Tropical Depression 21W

Passive Microwave (PMW) Intensity Information
Advanced Dvorak Technique (ADT)
Version 8.2.1
 

         Overpass     Inten           Ring    Ring          Wind           Forecast        Final        Target  
       Date    Time   Score  Meaning   Pct    Diam  BTdiff   Est   Sat    Lat    Lon    Lat    Lon    Lat    Lon              
     20141126 080200  -32.8      N/A  95.9%  44.44   17.84  30.0 SSMI16   8.6 -126.6    8.6 -126.6    9.3 -126.1 Analysis Plot     
     20141126 114300 -930.0      N/A   N/A  155.54  1270.6  30.0 SSMI18   8.7 -125.8    8.7 -125.8    9.8 -125.3 Analysis Plot     
     20141126 183533 -930.0      N/A   N/A  199.98  1281.1  30.0 SSMI15   8.8 -124.6    8.8 -124.6    8.7 -125.0 Analysis Plot     
     20141126 204200 -930.0      N/A   N/A  233.31  1281.0  30.0 SSMI16   9.5 -123.9    9.5 -123.9    8.8 -122.9 Analysis Plot     
     20141127 075200 -930.0      N/A   N/A  122.21  1260.6  30.0 SSMI16  10.1 -121.3   10.1 -121.3   10.9 -121.5 Analysis Plot     
     20141127 202900   -2.3      N/A   8.2%  88.88    2.34  30.0 SSMI16  10.6 -118.7   10.6 -118.7   10.4 -118.3 Analysis Plot     
     20141127 224200   -1.3      N/A  20.5% 133.32    1.28  30.0 SSMI17  10.7 -118.1   10.7 -118.1   10.8 -117.9 Analysis Plot     
     20141128 000900 -930.0      N/A   N/A  333.30  1278.7  30.0 SSMI18  10.8 -117.8   10.8 -117.8   10.6 -118.2 Analysis Plot     
     20141128 075237   -2.3      N/A  12.3% 144.43    2.33  40.0 SSMI15  11.3 -115.7   11.3 -115.7   10.7 -115.6 Analysis Plot     
     20141128 095100   -9.6      N/A  53.4%  33.33    9.60  40.0 SSMI17  11.5 -115.2   11.5 -115.2   11.8 -115.1 Analysis Plot     
     20141128 194329   -2.9      N/A  27.4%  99.99    2.89  45.0 SSMI15  12.9 -112.4   12.9 -112.4   12.8 -112.8 Analysis Plot     
     20141128 222800   -2.1      N/A  63.0% 111.10    2.15  45.0 SSMI17  13.1 -111.7   13.1 -111.7   13.1 -112.1 Analysis Plot     
     20141128 235700   15.3      N/A  79.5%  33.33   15.34  55.0 SSMI18  12.8 -111.7   12.9 -111.8   12.9 -111.8 Analysis Plot     
     20141129 090600   -0.0      N/A   N/A     N/A    0.00  55.0 SSMI16  13.4 -110.3   13.4 -110.3   13.3 -110.4 Analysis Plot     
     20141129 214300   -0.0      N/A   N/A     N/A    0.00  45.0 SSMI16  13.8 -108.3   13.8 -108.3   13.7 -108.4 Analysis Plot     
     20141130 083631 -930.0      N/A   N/A  299.97  1284.5  45.0 SSMI15  14.0 -106.8   14.0 -106.8   14.2 -107.2 Analysis Plot     
     20141130 085500 -930.0      N/A   N/A  322.19  1283.9  45.0 SSMI16  14.0 -106.8   14.0 -106.8   14.1 -107.3 Analysis Plot     
     20141130 110600   -2.6      N/A   N/A  222.20    2.56  45.0 SSMI17  14.0 -106.4   14.0 -106.4   14.0 -106.8 Analysis Plot     
     20141130 123500   -0.6      N/A   N/A   22.22     .57  45.0 SSMI18  14.0 -106.2   14.0 -106.2   13.7 -107.0 Analysis Plot
 
 
Legend:

  - Date/Time are determined from PMW imagery at Forecast (initial guess) Lat/Lon position.

  - Positive/Negative Latitude = North/South Hemisphere; Longitude = Western/Eastern Hemisphere.

  - "Ring Diam" value indicates the estimated surface eyewall diameter in km (the MI eyewall edge diameter minus 10 km).

  - "Ring Pct" is the percentage of the "ring" (eyewall inner boundary) that is 1) colder than the "hot spot" (warmest eye pixel) in the eye by 20K, or 2) the percentage that is a) colder than 232K and b) colder than the "hot spot" by 10K, whichever is greater.
  - Values are red if Ring % <= 65, yellow/brown if Ring % <= 85 and green if Ring % > 85.

  - "Tb diff" is the difference between the "hot spot" (warmest eye pixel) and the warmest pixel on the eyewall.

  - Intensity score are listed as negative, and not used, when the JTWC or NHC estimated Vmax is <55 kts in order to rule out weak but highly symmetric TCs.

  - Error messages in intensity scores: -920 is used when the hottest pixel in the eye is <200K, to prevent false positives; -930 means <85% of eyewall has observations/data.