![]() Results from this study suggest that design values used for hydrologic structures should be reevaluated given recent observations.Īpril 2013 was unusually wet across Illinois. Low-level circulation fields indicate that the most widespread heavy rain episodes occur when a synoptic anticyclone is positioned off the coast of the eastern United States. Event-averaged precipitable water values were shown to scale linearly with total precipitation in the winter season. In addition, heavy precipitation events were examined in the context of the background atmospheric environment using the Twentieth Century Reanalysis. No trend was found in autumn heavy precipitation occurrence. Temporal analysis of the top five 5- and 10-day amounts from 1900 to 2018 indicated an increasing trend with a higher frequencies in the 2000–18 period for spring, summer, winter, and annual time periods (statistically significant for spring and annual). Spatial distributions of the top seasonal amounts exhibited the highest values in boreal spring and summer, with the lowest values during winter. Annual and seasonal spatial patterns generally showed a trend of decreasing precipitation amounts as one moved northward through Illinois. The top five seasonal and annual heavy precipitation amounts for each duration were determined and examined for each station. This study examined the spatiotemporal variability associated with 5-/10-day heavy precipitation amounts for 48 high-quality and long-duration (1900–2018) stations in Illinois. Summer and annual not shown because of N ≤ 1. Anomaly fields were obtained from the Twentieth Century Reanalysis (V2c) dataset and calculated from the 1981–2010 averages. Precipitable water values were obtained from the Twentieth Century Reanalysis (V2c) dataset.Ĭomposite 850-mb wind vector and isotach (fill) anomalies (m s −1) for (a) spring 5-day episodes, (b) spring 10-day episodes, (c) autumn 5-day episodes, (d) autumn 10-day episodes, (e) winter 5-day episodes, and (f) winter 10-day episodes. Total (a) 5- and (b) 10-day precipitation amounts (mm) as a function of event average precipitable water (mm). Least squared regression lines are plotted and shown in dashed line style if significant at the α = 0.05 level.įrequency of stations experiencing one of their top five annual or seasonal (a) 5- and (b) 10-day heavy precipitation events by 20-yr epoch, 1900–2018. Interannual variability (1900–2018) of the number of stations experiencing a top five 5-day or 10-day heavy precipitation event. Black dots indicate the NWS cooperative stations used in the contour analysis. Black dots indicate the NWS cooperative stations used in the contour analysis.Īverage of the top five spring (a) 5- and (b) 10-day, summer (c) 5- and (d) 10-day, autumn (e) 5- and (f) 10-day, and winter (g) 5- and (h) 10-day heavy precipitation events (mm) from 1900–2018. Precipitation data obtained from the PRISM Climate Group, Oregon State University ( ).Ĥ8 NWS cooperative weather stations used in this study over the period 1900–2018.Īverage of the top five (a) 5- and (b) 10-day heavy precipitation events from 1900–2018. Havana just missed with 11.8 inches as of 4 p.m.Total precipitation (mm) for the (a) 5- and (b) 10-day period ending. Hitting the 1-foot mark were Canton and the McDonough County community of Colchester. ![]() That total had not been updated by the weather service as of Wednesday evening.Īccording to the weather service, Minonk received 13 inches of snow. Lewistown reported 14.4 inches early Wednesday morning. The highest reported area total was 14.5 inches, just outside Macomb. Pekin recorded 12 inches of snow Wednesday, according to a Facebook post by the weather service. Of the official total from this storm, 8.2 inches fell Wednesday and 2.4 inches fell Tuesday. 1, 2011, the Peoria airport received 11.8 inches, a record for that date. The previous record total snowfall for Feb. Downing Peoria International Airport was 10.6 inches, according to the National Weather Service office in Lincoln. Officially, however, the snow total at the Gen. Snow fell about as expected Wednesday in the Peoria area - heavily.Īs of 6 p.m., many areas in Peoria had 12 inches on the ground with several spotters around the area showing a foot of snow.
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