National Weather Service United States Department of Commerce

A storm system will bring periods of rain and scattered thunderstorms, beginning after midnight. However, it may take until early Monday morning for the rain to reach as far east as the Indiana border. The bulk of the rain will fall through Monday morning, before moving out from west to east. Rainfall amounts over half an inch will be common, and may be close to an inch near and south of I-70. Expect windy conditions to develop as the rain moves out, and gusts of 30 to 35 mph are likely by afternoon.
A line of storms is expected to move through central and southeast Illinois this morning. There is a marginal risk that some of the storms that move through southeast Illinois could be severe with damaging winds the primary severe weather threat.
Early indications suggests that Halloween will likely be dry this year, but temperatures will be well below normal. The Climate Prediction Center's 8-14 day outlook (htps://www.cpc.ncep.noaa.gov/products/predictions/814day/) favors 60-70% chance of below-normal temperatures and 33-40% chance of below-normal precipitation, from Oct 27 through Nov 2, across central and southeast Illinois.