The past two mornings have seen rather chilly temperatures with record lows set in Mason City and Ottumwa. The featured map presents the lowest temperature reported since the first of August. While some locations have dipped into the 30s, the major urban centers of Des Moines, Council Bluffs, and Iowa City have barely breached 50 degrees. This is a classic urban heat island effect of having lots of warm buildings and concrete slowing the rate of cooling overnight.

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Tags:   heatisland