Warmer air will continue to spread across the region over the next several days, pushing temperatures at least 10-20 degrees above normal....with record high temperatures possible on Friday. In the meantime...a low pressure system will lift north northeast through region today and tonight...bringing showers and a chance of thunderstorms to Missouri and Illinois. One to two inches of rain can be expected with this system...especially for areas along the Mississippi River. Beyond that...another system will move into the area this weekend. Precipitation with this system will start off as rain...before mixing with then changing over to all snow before coming to an end Sunday night. Some light snow accumulations may be possible across central and northeast Missouri as well as west central Illinois.   (Please visit http://weather.gov/lsx for more information.)