The National Weather Service

National Oceanic and Atmospheric Administration

National Climatic Data Center

The Weather Channel

wunderground.com
The Weather Underground

Weather
From CNN

Illinois State Information
from the Interactive Weather Information Network

Current Warnings for Illinois

Winter Road Conditions

Urbana-Champaign Weather
Department of Atmospheric Sciences
University of Illinois at Urbana-Champaign

See Also - UIC Electronic Reference Shelf:
Geographical Information
Travel