Fairfield Ledger

Mt. Pleasant News   Wash Journal
Neighbors Growing Together | Jul 18, 2018

Hot, humid weather stresses crops, livestock last week

Jul 25, 2017

DES MOINES — Above normal temperatures were accompanied by widely varying rainfall and some severe weather during the week ending July 23, according to the USDA, National Agricultural Statistics Service.

“The hot and humid weather created stress for both crops and livestock last week, particularly in areas that have missed the recent rains,” said Iowa Secretary of Agriculture Bill Northey. “South central Iowa in very dry, with over 90 percent of topsoil short or very short of moisture.”

The report, which is released by the USDA National Agricultural Statistical Service weekly from April through October is also available on the Iowa Department of Agriculture and Land Stewardship’s website at www.IowaAgriculture.gov and on USDA’s site at www.nass.usda.gov/ia.

According to the report summary, statewide there were 5.4 days suitable for fieldwork. Activities for the week included hauling grain, applying herbicides and insecticides, cultivating, and haying.

Topsoil moisture levels rated 20 percent very short, 32 percent short, 45 percent adequate and 3 percent surplus. Over 90 percent of south central Iowa’s topsoil falls into the short to very short moisture level categories, while 99 percent of northeast Iowa’s topsoil falls into the adequate to surplus categories.

Subsoil moisture levels rated 14 percent very short, 32 percent short, 52 percent adequate and 2 percent surplus.

Seventy-four percent of Iowa’s corn crop has reached the silking stage, four days behind last year, but two days ahead of the five-year average. Corn conditions deteriorated slightly to 2 percent very poor, 6 percent poor, 24 percent fair, 55 percent good, and 13 percent excellent.

Nearly three-quarters of the soybean crop was blooming, with 30 percent of soybeans setting pods, one day ahead of average. Soybean condition also dropped slightly with 62 percent rated good to excellent.

Oats coloring reached 89 percent, one week behind last year. Forty-one percent of oats for grain or seed have been harvested, four days behind last year. Oat condition rated 71 percent good to excellent.

Crops were described as suffering from heat stress and lack of moisture across much of the state.

The second cutting of alfalfa hay reached 90 percent complete and third cutting reached 8 percent, five days behind average. Hay condition rated 61 percent good to excellent.

Pasture condition continued to decline with just 41 percent good to excellent. High temperatures and humidity were reported to cause normal summer heat stress to livestock, with some reports of heat-related deaths.


Weather summary

It was a hot and humid week across Iowa with exceptionally variable rainfall.

Major flooding occurred over parts of northeast Iowa where torrential rains fell during the day and night of July 21, while parts of the moderate drought area in south central Iowa received no rain at all.

For the most part the heavier rains fell in what were already the wetter portions of the state. However, portions of the moderate drought area, roughly along U.S. Highway 30 from Crawford to Tama counties, saw some significant rain the night of July 20.

Weekly rain totals varied from none at Murray, Osceola, Chariton and Allerton to 10.12 inches at Ionia in Chickasaw County. Rain totals thus far in July vary from only 0.16 inches at Sioux Rapids and Cherokee to 13.88 inches at Guttenberg. The Guttenberg July total is the highest for any month at that location among 86 years of record while the Cherokee and Sioux Rapids totals would be new record lows for July if no more rain were to fall before the end of the month.

Some of the rain was accompanied by severe weather with the most damaging storms occurring across 15 north central and northeast counties, roughly north of an Estherville to Dubuque line, the afternoon of July 18 and evening with widespread high winds of 50 to 70 mph and a few tornadoes. Meanwhile hot weather prevailed with the temperature reaching 95 degrees somewhere in the state each day of the reporting week.

The hottest weather was concentrated across southern Iowa with temperatures for the week averaging from two to three degrees above normal across the northeast one-third of the state and five to nine degrees above normal across the southwest. Highest temperatures were 101 degree readings at Ottumwa on July 20 and Des Moines on July 21. These were the highest temperatures recorded in Iowa since Sept. 9, 2013.

The combination of heat and humidity produced a heat index (how hot the air “feels”) of 117 degrees at Clarinda on July 20 and at Harlan on July 21.

Temperatures moderated over the weekend with Sheldon recording a morning low of 52 degrees on Sunday (24th). The statewide average temperature was 5.3 degrees above normal while rain averaged 1.42 inches compared to a normal of 0.99 inches for the week.

The Iowa preliminary weather summary is provided by Harry Hillaker, state climatologist, Iowa Department of Agriculture & Land Stewardship.


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