IOWA PRELIMINARY WEATHER SUMMARY

Written by Theresa Rose on May 12, 2015

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

It was a warm week across Iowa with frequent precipitation. Temperatures were well above normal through Thursday (7th) and then cooled to near normal readings from Friday (8th) into Sunday (10th). Temperature extremes varied from a Saturday (9th) morning low of 33 degrees at Sibley to afternoon highs of 84 degrees at Muscatine on Wednesday (6th) and at Clinton, Davenport and Donnellson on Thursday (7th). Temperatures for the week as a whole averaged from three degrees above normal over the northwest to eight to nine degrees above normal over the southeast with a statewide average of 6.4 degrees above normal. Rainfall was widespread from Sunday (3rd) evening into Monday (4th) morning with heaviest rain over northeast Iowa. Rain was again widespread the next night with greatest amounts over east central and southeast Iowa. Showers and thunderstorms were also widespread from Wednesday morning through Thursday evening with greatest amounts over west central and southwest Iowa. Light rain fell across far southeast Iowa on Friday (8th) while Saturday (9th) was dry in most areas. Thunderstorms moved back into the state on Sunday (10th) morning but the majority of this precipitation fell too late to be reflected in this week’s statistics. Weekly rain totals varied from only 0.09 inches at Hartford in Warren County to 4.46 inches at Lost Nation in Clinton County. The statewide average precipitation was 0.98 inches, nearly matching the weekly normal of 0.99 inches. There were scattered reports of high winds and large hail on Thursday. More intense severe weather occurred on Sunday (10th), particularly in Calhoun County, but will be included in next week’s summary. Soil temperatures at the four inch depth were averaging from the upper fifties in northwest Iowa to lower sixties across the southeast.