After being so wet last year and with a recently typical wet spring season expected this year, it was hard to imagine that we'd have concerns about dryness over the state for early June. The featured chart presents a metric called arridity, which is an index that combines standardized temperature and precipitation departures. The index is evaluated each day over the given number of trailing days and is plotted for Sioux City. The long term (365 day) value continues to creep higher and is about to cross zero for the first time since early 2018. Some significant rains are forecast this week, so it will be interesting to see how wide spread those are over the state to erase some recent dryness.

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Tags:   arridity