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Urban Modification of Freezing-Rain Events

TitleUrban Modification of Freezing-Rain Events
Publication TypeManual Entry
Year of Publication2003
AuthorsChangnon, Stanley A.
Journal of Applied MeteorologyJournal of Applied Meteorology
Pagination863 - 870
Date Published2003
PublisherAmerican Meteorological Society
Short TitleJ. Appl. Meteor.
Citation Key1056
Community Notes

Chicago, IL was one city of focus in this study.

Data Ref:Changnon, S. A. 2002. Developing data sets for assessing long-term fluctuations in freezing rain and ice storms in the U.S. Res. Rep. 51, Changnon Climatologist, Mahomet, IL, 29 pp.

Chicago has a long-term weather station within the city and at the airport for urban-rural comparisons, respectively.

early and late winter results were also compared for the influence of the lakes on the urban vs. rural freezing-rain frequency

"...lake effects acted to moderate freezing-rain events in early winter when lake temperatures were relatively warm. ...the lake influence is about one-fourth of that due to the urban heat island. Furthermore, the Chicago values are less than those at lakeside locations just north and south of Chicago, revealing that the lake effect was a factor in the lower Chicago values but was of lesser magnitude than the urban effects."

"the urban-related decreases range from 12% to 31%"

"the Chicago heat island effect on snowfall events led to a 23% decrease, a value similar to the freezing-rain decreases attributed to the heat island"

the first freezing-rain events of a given year occured one month later in the city of Chicago than for surrounding areas.



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