Fig. 10.39. Same as Fig. 10.38, except for dew point temperature (C)

Fig. 10.38. Air Temperature (C) time-series plot comparing the Ames METAR and Ames RWIS observations to the RWFS forecasts

Fig. 10.40. Cloud cover time-series plot comparing the Ames METAR only to the RWFS forecasts

MDSS_Tech_Perf_Report_2912
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Dew Pt Temperature Comparison for Feb 20, 2004

AMW METAR woFSL

0 2 4 6 8 10 12 14 16 18 20 22 0 2 4 6

8 10 12 14 16 18 20 22 0

Feb 20, 2004

Fig. 10.39. Same as Fig. 10.38, except for dew point temperature (C).

Part of the temperature forecast problem after the event may be due to poor cloud cover

forecasts (Fig. 10.40). Following the cessation of precipitation, the forecast cloud cover

decreases dramatically from overcast to scattered skies. Ames METAR observations

indicated that skies remained overcast for the next ~24 hours. This lack of forecast cloud

coverage may have allowed for the predicted air temperatures to fall off more during the

night because less cloud insulation was forecast than observed.

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