Tucson, AZ Initial Results

• 8/10/2011 – 8/15/2011– Relatively cloudy/variable days

Model settings• Domain

– 3 nests, Δx = 1.3 on inner nest

• Initialization– 12 UTC, driven by NAM– Clouds initialized by GOES

• Parameterizations– Cloud Physics: Thompson– PBL: YSU– RTM: RRTM (Δt = 5 min.)– Cumulus parameterization on outer

nest only– 5th order vertical diffusion

• Run time– Intra-day (0-15 hours)

Initial results• WRF-CLDDA has RMSE of

up to 50% less than NAM

• Only 1 tested day (8/10/11) produced results worse than the NAM

DateWRF RMSE

(W m-2)RMSE Ratio

To NAM8/10/2011 301.5 1.34

8/11/2011 144.4 0.61

8/12/2011 137.4 0.59

8/13/2011 101.0 0.51

8/14/2011 142.9 0.54

8/15/2011 117.2 0.79

Correct evaporation timing

Afternoon cloud formation