From the Chicago Tribune:
New storm could bring Sunday downpours, possibly 2006's largest single rain tally
Published April 28, 2006
Storms like this weekend's, preceded by extended periods of easterly winds capable of introducing dry air at low levels, have been known to slow the advance of precipitation into Chicago. But, predictions of extraordinary 70+ m.p.h. southerly winds just a mile above ground from the Gulf of Mexico into western Illinois late Saturday night, showing up in the supercomputer model projections of more than one major meteorological agency. The consistency of these predictions suggests it's actually likely to occur. Such a wind would lay the foundation for an expeditious transfer of Gulf moisture into the Midwest to fuel what promises to be a very slow-moving spring storm. The system's slow movement could extend sporadic precipitation across 3 or even 4 days and produce impressive totals in Chicago (the Navy and Canadian models suggest 2"+. Even greater amounts--possibly 4-5" or more--threaten sections of Missouri, eastern Kansas, Oklahoma and Arkansas. To date in 2006, individual storms here have generated 1"+ totals only twice. Any total exceeding the 1.20" which fell at O'Hare back on Feb. 15-16 would qualify as the year's heaviest yet. The steadiest rains may begin Saturday night. Stay tuned!
Sources: NWS-Chicago, various supercomputer forecast models
WGN-TV/Zach Albers and Jen Nagle
3 hours ago