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Weekly Iowa Weather Report, April 16, 2017

Windmill at Sunset in Oklahoma
Darlene Tompkins

Temperatures were well above seasonal normals except from Tuesday into Wednesday morning. A freeze was recorded over extreme western Iowa on Tuesday morning with temperatures falling to 23 degrees at Little Sioux and Sioux City. A light freeze also occurred over northeast Iowa on Wednesday morning with Elkader reporting the lowest temperature at 28 degrees.

The warmest weather was from Thursday through Saturday. Thursday afternoon highs reached 81 degrees at Donnellson and Keokuk while highs on Saturday reached 82 degrees at Donnellson, Indianola, Keosauqua and Ottumwa.

Temperatures for the week as a whole averaged from 4 to 6 degrees above normal in the northwest to 8 to 10 degrees above normal over the southeast with a statewide average of 7.8 degrees greater than normal for mid-April.

There were showers and thunderstorms scattered across the state from Sunday night into Monday afternoon with greatest rain amounts of a quarter to one-half inch falling over the far southeast. Showers and thunderstorms were again scattered over much of the state Wednesday night into Thursday morning with the greatest rain amounts occurring across the northeast where a few locations saw up to two-thirds of an inch. However, the bulk of the week’s rain came from statewide thunderstorms on both Friday and Saturday.

The greatest rain amounts generally were along and east of Interstate Highway 35 with only a few areas in western Iowa picking up more than an inch of rain. Severe thunderstorms brought reports of large hail to 24 counties Saturday afternoon and evening with hail up to tennis ball size reported in Plymouth, Warren and Black Hawk counties. Easter Sunday was dry statewide.

Weekly rain totals varied from 0.15 inches at Lorimor in Union County to 3.94 inches at both Fairfax and Marion in Linn County. The statewide average precipitation was 1.14 inches, or nearly double the weekly normal of 0.61 inches. Finally, soil temperatures as of Sunday averaged in the low fifties over the far northwest to around sixty degrees over the south.

Source:  Harry Hillaker, State Climatologist, Iowa Department of Agriculture & Land Stewardship

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