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An analysis of the southeast Iowa-west central Illinois snow event of 10 December 1989
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1990
[PDF-4.36 MB]
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Description:During the late afternoon and evening of December 10, 1989, a narrow band of snow developed from near Ottumwa, Iowa (OTM) to Peoria, Illinois (PIA). Snowfall accumulations in this band averaged about four inches (Fig. 1). Nearly five inches fell in a 12-hour period at the National Weather Service (NWS) Office at PIA. The heaviest snow occurred between 0000 UTC and 0450 UTC December 11, when the rate of snowfall reached one inch per hour. Snowfall of this magnitude is a relatively rare occurrence in PIA. During the ten previous years, PIA recorded only six snowfalls of equal or greater magnitude. Because initial snowfall forecasts were too low, the event had a much greater impact on the public than a five inch snowfall normally has for this part of the Midwest. This paper will examine the synoptic scale weather pattern associated with the snow event, and discuss important forecast parameters which may have been overlooked.
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