Abnormally Dry Weather Creeps into Western Illinois

The latest US Drought Monitor has an area of “abnormally dry” conditions in western Illinois. This does not mean drought but it means that it is an “area of interest” to paraphrase what they say on TV when they have suspicions about someone but have no hard evidence.

In this particular case, the only evidence are widespread watering in towns and stressed corn and soybeans – especially the late planted fields with shallow root systems.

Rainfall amounts in those areas have been small and widely scattered (second figure). For example, Quincy airport has received only 0.25 since July 1. Combined with the high rates of evapotranspiration in July, roughly two-tenths of an inch per day, this situation can lead to the rapid withdrawal of topsoil moisture. Other areas in north-central Illinois may be candidates for the “abnormally dry” status in coming weeks if the rains do not return.



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