On the 2012 Drought and other items of interest Daryl Herzmann Assistant Scientist, ISU Agronomy

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Presentation transcript:

On the 2012 Drought and other items of interest Daryl Herzmann Assistant Scientist, ISU Agronomy

Don’t like what you see? Do what this guy did! Getty/AP

What is a Drought? American Meteorological Society – Drought is a relative term, therefore any discussion in terms of precipitation deficit must refer to the particular precipitation-related activity that is under discussion. Wikipedia – Drought is an extended period of months or years when a region notes a deficiency in its water supply whether surface or underground water. National Drought Mitigation Center – No single operational definition of drought works in all circumstances Federal Government Drought Declaration – … as reported in the U.S. Drought Monitor when any portion of a county meets the D2 (Severe Drought) drought intensity value for eight consecutive weeks. A county that has a portion of its area in a drought intensity value of D3 (Extreme Drought) or higher at any time during the growing season also would be designated as a disaster area.

Which has greater impacts? For Iowa? – Getting no precipitation between 1-14 July – Getting no precipitation between 1-14 February For Lake Tahoe, CA? – Getting no precipitation between 1-14 July – Getting no precipitation between 1-14 February For Chicago Cubs? – No World Series win since 1906 For New York Yankees? – No World Series win since 2009

Drought Definition: Focus on Impacts. Images from National Drought List

About 2012 Drought

2012 Corn Yield By County USDA NASS Quickstats

Billion Dollar Rainfall?

Carroll County

Tama County

Jackson County

The lack of rain was not the only problem

2012 Summary Spring soil moisture reserves were a huge help for those locations that got late July / early August rainfall 2012 was not a failure in Iowa due to some limited and very timely rainfalls (Jul 25 th ) Ridiculously hot March and mid April hard freeze were somewhat forgotten

My Thoughts on 2013 Winter precipitation / snowfall is not as important as media makes it to be. – Runoff – Sublimation, evaporation – Just not enough of it March, April, May are way more important Current soil moisture is a critical concern, we need to replenish before growing season (10+ inches of rain). Much different today than 2012.

ISMMS001

Time for Questions? Daryl Herzmann