Record flood-producing rainstorms of 17-18 July 1996 in the Chicago metropolitan area : part II[,] hydrometeorological characteristics of the rainstorms /

By:

Angel, James R

Contributor(s):

Huff, Floyd A [aut]

Material type: Text

TextSeries: Wetmore Collection | Publisher: Boston, Mass. American Meteorological Society 1999Description: 7 pages : illustrations ; 28 cmContent type:

text

Media type:

unmediated

Carrier type:

volume

ISBN:

0813326206 (paperback alk. paper)
0813326192 (hardcover alk. paper)

Subject(s):

DDC classification:

20 363.3/493/097709049

LOC classification:

GB1399.4.M72 G74 1996

Other classification:

VF WTHR.090.b.e.c.02.013 AngJ 1999 ASFPM

Online resources:

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Summary: ABSTRACT The rainstorm on 17-18 July 1996 in northern Illinois produced three rainfall records. The 43.0-cm total storm rainfall at Aurora was the greatest point rainfall recorded for storm durations of 24 hours or less in this century in Illinois and most surrounding states. The 27.9-cm storm rainfall recorded in the southwestern part of the Chicago metropolitan area was the heaviest 24-h amount ever recorded in that city. The July 1996 storm also produced the heaviest 24-h mean rainfall recorded in Illinois over areas of 5200 and 13 000 km² immediately surrounding the storm center. An area of approximately 12 000 km² experienced 24-h point rainfall amounts that exceeded those expected to occur, on the average, once in 10 years. Similarly, the 25-, 50-, and 100-yr frequency values were exceeded over areas of 6730, 4920, and 3500 km², respectively. One concern resulting from a major rainfall event such as this storm is its impact on the rainfall frequency analysis. This new information may result in changes in the estimated rainfall amounts at selected return periods, which are used to design water-handling structures. Based on previous research, the Aurora rainfall appears to exceed the 1000-yr return period. However, fitting a statistical distribution to the annual maximum time series and using regional averages minimized the effect of this storm on rainfall frequency estimates.

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Item type	Current library	Collection	Call number	Status	Date due	Barcode	Item holds
Books	ASFPM Library	Wetmore Collection	VF WTHR.090.b.e.c.02.013 AngJ 1999 ASFPM (Browse shelf(Opens below))	Available

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Previous	VF WTHR.070 IBHS 199u ASFPM Protect your home against hail damage [brochure] /	VF WTHR.090 IBHS 199u ASFPM Protect your home against tornado damage [brochure] /	VF WTHR.090.b.e.c.02.006 McCJ 1979 ASFPM Storm and flood of July 31-August 1, 1976, in the Big Thompson River and Cache la Poudre River Basins, Larimer and Weld Counties, Colorado /	VF WTHR.090.b.e.c.02.013 AngJ 1999 ASFPM Record flood-producing rainstorms of 17-18 July 1996 in the Chicago metropolitan area : part II[,] hydrometeorological characteristics of the rainstorms /	VF WTHR.090.b.e.c.02.013 ChaS.1 1999 ASFPM Record flood-producing rainstorms of 17-18 July 1996 in the Chicago metropolitan area : part I[,] synoptic and mesoscale features /	VF WTHR.090.b.e.c.02.013 ChaS.2 1999 ASFPM Record flood-producing rainstorms of 17-18 July 1996 in the Chicago metropolitan area : part III[,] impacts and responses to the flash flooding /	WRMT.10.ASFPM2010 Before the council on environmental quality: Proposed national objectives, principles, and standards for water and related resources implementation studies, Comments of the Association of State Floodplain Managers	Next

Includes bibliographical references.

Staff.

ABSTRACT The rainstorm on 17-18 July 1996 in northern Illinois produced three rainfall records. The 43.0-cm total storm rainfall at Aurora was the greatest point rainfall recorded for storm durations of 24 hours or less in this century in Illinois and most surrounding states. The 27.9-cm storm rainfall recorded in the southwestern part of the Chicago metropolitan area was the heaviest 24-h amount ever recorded in that city. The July 1996 storm also produced the heaviest 24-h mean rainfall recorded in Illinois over areas of 5200 and 13 000 km² immediately surrounding the storm center. An area of approximately 12 000 km² experienced 24-h point rainfall amounts that exceeded those expected to occur, on the average, once in 10 years. Similarly, the 25-, 50-, and 100-yr frequency values were exceeded over areas of 6730, 4920, and 3500 km², respectively. One concern resulting from a major rainfall event such as this storm is its impact on the rainfall frequency analysis. This new information may result in changes in the estimated rainfall amounts at selected return periods, which are used to design water-handling structures. Based on previous research, the Aurora rainfall appears to exceed the 1000-yr return period. However, fitting a statistical distribution to the annual maximum time series and using regional averages minimized the effect of this storm on rainfall frequency estimates.

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