10 July 2015
VISFogDiff    MVFR    IFR    LIFR    METAR   
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10 July 2015 08:00 UTC
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Discussion Questions: What time do IFR probabilities initially begin to increase across southern IA? Is this before or after IFR conditions are observed? What time do they begin to decrease? Is this before or after ceilings and visibilities increase in surface observations?