About the Model Diagnostics Discussion
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The WPC model diagnostic meteorologist prepares the Model
Diagnostic Discussion which evaluates the NAM and GFS along with
other operational model and ensemble guidance for each significant system affecting the continental
U.S. through 84 hours from model initialization.
This discussion emphasizes model differences and preferences, with an evaluation of NAM/GFS analyses
if there are significant errors and a review of model trends and biases if appropriate.
There are two issuances during each of the day and night shifts corresponding to the arrival of latest model data.
The following table shows the deadline and content for each issuance.
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| Issuance Time | Content |
| 0445Z/1645Z | Evaluate NAM and GFS initializations Compare NAM/GFS and other available model/ensemble guidance Review model trends and biases as appropriate Discuss model preferences |
| 0645Z/1845Z | Evaluate the ECMWF/UKMET/Canadian global models relative to other current guidance Finalize model preferences |
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During the cool season (Nov 1 - Apr 15), this meteorologist is also primarily responsible for requesting reconnaissance flights whenever the potential exists for major winter storm development over the East or Gulf Coast states. |