Enhanced IR Step 2C
EIR "EYE" Pattern (Continued-2): EYE ADJUSTMENT #

  • Each abbreviation on the EIR Eye adjustment chart comes from the BD enhancement curve, which Dvorak developed and used for EIR analysis on Tropical Cyclones (TC). 
  • Each color is directly correlated to a temperature range.
  • It is standard to use these shortened color terms rather that the temperature values themselves in TC Analysis.  
  • Find the shade of the coldest ring completely surrounding the eye (without respect to embedded distance). 

  • Click here for the first example image!

    Click here for another example!
    • Determine the warmest shade in the eye and the shade of the coldest ring surrounding the eye.
    • Apply these shades  to the Eye Adjustment table. 
    • You should get a -1.0, -0.5, 0.0, 0.5 or 1.0 . 
    • Do not use for eyes 45nm diameter or larger.
    • For elongated eyes, subtract 0.5 if none subtracted by chart.
    Go on to the Banding feature
    you enter this information 
    into your Dvorak Worksheet
     Do you need a  Banding Feature Addition?
     After you determine the Data T and enter it into your Dvorak Worksheet, then Go on to Step 4 
    Go to Step 4 Now
    (Skip step 3 if you chose 2A,B,C or E)
    Go to the Previous Step
    Go to Step 3 (CCC) if needed
    Return to top level EIR Dvorak Page
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    For More information, contact:
    Paul  McCrone, Chief Forecaster
    HQ Air Force Weather Agency (AFWA) 
    Meteorological Satellite Applications
    Office Code: XOGM
    106 Peacekeeper Dr. STE 2N3
    Offutt AFB, NE 68113-4039

    COMM: (402) 294-2821
    DSN: 271-2821
    Fax:    (402) 294-5872
    Many thanks to the University of Nebraska for hosting this page!