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NCEP Service Center Evaluations AWC Steve Silberberg
Real-time AWC evaluation of NAM/NAM-Parallel
Wind, turbulence diagnostics (Ri, Ellrod, TKE generation, etc.), RH (in most areas) and stability indices (LI, K) all slightly better for NAM-Parallel
RH areas ≥ 90% are smaller over the California coastal waters at 0.982 sigma in the NAM-Parallel.
RH areas ≥ 90% are smaller at all lower levels (< 850 hPa) over the upper Midwest for the NAM-Parallel. At 850 hPa this reverses with the NAM-Parallel having more areas ≥ 90%. At 700 hPa and above RH areas ≥ 90% are smaller for the NAM-Parallel. Could be case dependent.
In upslope areas of the Rockies and during Gulf Coast return flow situations, the NAM-Parallel shows smaller areas of RH ≥ 80%. After F36, the NAM-Parallel shows areas of RH ≥ 80% that do not exist in the operational NAM.
After F24, the NAM-Parallel stability indices were more unstable than the operational NAM.