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Pattern Similar To 2009

July 12, 2014, 10:00 PM by Scot Mundt

Pattern Similar To 2009

We've been advertising a big cool down for early next week with highs only in the sixties. Strong north winds will even make it fell a tad cooler.

We've seen this before, it happened in 2009 when Sioux Falls had highs ranging from seventy-one to seventy-seven July 16 through 18, which averaged ten degrees below the climate average of 84. We even recorded a record low of 50 July 18 that year.

Here's the upper air pattern from that time. It shows a strong low pressure system just north of Lake Superior, allowing cold Canadian air in. 

Forecast models for next week have been showing a very similar pattern.

The rest of the month that year remained cool with an average high of seventy-three, the highs ranged from seventy to 85.  Unfortunately, the rain stayed away with Sioux Falls only recording three-quarters of an inch for the last two weeks of the month.  We'll see if we follow those patterns this year.

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