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Title:The silting of Ridge Lake, Fox Ridge State Park, Charleston, Illinois
Author(s):Stall, John Byron; Gottschalk, L.C.; Klingebiel, Albert A.; Sauer, E.L.; Melsted, S.W.
Contributor(s):Illinois State Water Survey
Subject(s):Sedimentation and deposition
Geographic Coverage:Ridge Lake (Ill.)

Studies with two 3-cm radars and dense surface hail networks showed that the areal extent of hail during a given precipitation period can be estimated in a study area from the areal extent of the highest half-order of reflectivity for the day. However, only 20 percent of the high reflectivities (>1 0 5 mm6m-8), surface or aloft, were associated with point hailfalls In-storm hail volumes could not be detected by magnitude of reflectivity, reflectivity gradients, or echo volumes. However, hail echoes showed large volume increases above the —5C level in the 5 minutes prior to hail A hail-producing echo could be identified by three or more of five criteria relative to a given day: 1) echoes were in the taller half of the first echoes; 2) had above average first echo depths, top to base, 3) had above average reflectivities at first echo; 4) grew more than 3000 feet, and 5) existed more than 20 minutes. Conditions leading to hailstorm development are rooted often in the initial phases of a cloud (echo) development. Complete 3-dimensional radar reflectivity scanning must be accomplished over a study area in 2 minutes or less to identify hailstorms and to measure surface hail areas with 3-cm radar.

Issue Date:1951
Publisher:Illinois State Water Survey
Series/Report:Illinois State Water Survey. Report of Investigation ; no. 07
Genre:Technical Report
Description:Cover title.
Enumeration continues through succeeding title.
Rights Information:Copyright 1951 Board of Trustees of the University of Illinois
Date Available in IDEALS:2018-11-15
Has Version(s):
Identifier in Online Catalog:725625
OCLC Identifier:(OCoLC)ocm10250499

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