Enhanced IR Step 7
Beginning the T Number Determination

1. Use DT when it is clear-cut and representative. 2. Use PT only when DT is not clear-cut/representative, and PT is.
  • Often happens with Shear DT estimates (Shear DT often too high).
  • Remember that the Data T is often calculated, so it may be unrealistic. 
3. Use MET only when PT and DT are not clear-cut and representative.
  • Thumb-rule: PT is NOT clear cut when you have difficulty distinguishing amongst three different PT pictograms along the horizontal.  Example: on Vis PT diagram, you honestly have difficulty telling the difference between an A4.0, A5.0, and A6.0

Go to Step 8 
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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

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