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Iowa Preliminary Weather Summary
By: Harry Hillaker, State Climatologist - 08/22/2017

Seasonally mild temperatures prevailed through most of the week while rainfall was more widespread and frequent than in recent weeks. Rain fell nearly statewide on Sunday (13th) night into Monday (14th) morning and also on Tuesday (15th) and Wednesday (16th). Thursday (17th) was mostly dry while on Friday (18th) evening and night a few isolated thunderstorms brought rain to small areas from northwest, through central and into southeast Iowa. A few of these Friday night storms were severe, including a strong tornado near Melvin in Osceola County of far northwest Iowa. Saturday (19th) was mostly dry while thunderstorms brought rain to about the southwest one-half of the state late Saturday night into Sunday morning (20th). The heaviest rains fell across far western and northwest Iowa on Wednesday morning.

Weekly rain totals were generally below normal across the east one-third of Iowa and above normal over much of the remainder of the state. Little Sioux in Harrison County reported the most rain during the week with 7.21 inches while Farmington in Van Buren County picked up only 0.04 inches. The statewide average rainfall was 1.35 inches while normal for the week is 0.97 inches. The coolest weather in most areas came on Sunday (13th) when highs were mostly in the seventies statewide.

The remainder of the week was mostly cooler than normal over the north and slightly above normal over the far south. Temperature extremes ranged from afternoon highs of 92 degrees at Donnellson on Tuesday and at Osceola on Saturday to a Saturday morning low of 49 degrees at Cresco.

Temperatures for the week as a whole averaged two to three degrees below normal across northeast Iowa to about one degree above normal over the far south.


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