Tuesday was a dreary day for most of Iowa with drizzle and occasional rain showers. The featured chart presents a time series this month of hourly cloudiness and near surface horizontal visibility reports from the Des Moines airport weather station. The top panel attempts to illustrate cloudiness by shading reported cloud level and amount reports by extending those values vertically away from the surface. For ASOS, once an overcast condition is reported, there are no subsequent cloudiness reports above that level. The bottom panel is more straight forward with the horizontal visibility reports shaded by the reported distance value. So the lowest cloud decks this month occurred back on the 6th, with the 10th joining yesterday for second lowest for the month.

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