The National Weather Service released their outlooks for September and beyond. According to them, ENSO-neutral conditions are favored (~85% chance during Jul-Sep, decreasing to ~55% during Dec-Feb) through the Northern Hemisphere winter 2017-18. In other words, no El Niño, no La Niña, it’s a La Nada. For Illinois, the odds are in favor of a wetter September and a warmer fall. Here are the details with maps.
September: an increased chance of wetter than normal conditions for September in Illinois, while there are equal chances (EC) of above, below, and near-normal temperatures for September.
September – November: an increased chance of above-normal temperatures for this fall for Illinois and much of the US. Southern Illinois has an increased chance of above-normal precipitation, while the rest of the state has equal chances (EC) of above, below, and near-normal precipitation.
December – February: an increased chance of above normal temperatures in southern Illinois. The rest of the state has equal chances (EC) of above, below, and near-normal temperatures. There is not much to say about the precipitation outlook – it could go either way.
