Author

Elias Johnson

Publication Date

1966

Document Type

Dissertation/Thesis

First Advisor

Lahey, James F.

Degree Name

M.S. (Master of Science)

Department

Department of Earth Science

LCSH

Long-range weather forecasts--Illinois--Sycamore||Sycamore (Ill.)--Climate

Abstract

While investigating the variable manner in which temperatures at Sycamore, Illinois change from their high values of summer to their winter minima, a pronounced drop in the 40-year average of the running 5-day mean maximum temperature was noted during the latter part of September. It was then decided to investigate the character of declines in the maximum temperature at Sycamore during September, and, if possible, relate these temperature drops to hemispheric changes in sea-level pressure. If one should note systematic and unique changes In hemispheric pressure fields occurring prior to various kinds of temperature breaks, climatological estimates of future temperature breaks might be enhanced by use of the diagnostic aspects of these prior broadscale pressure changes. The techniques used 'to accomplish this analysis are as follows: 1) establish homogeneous samples from the total population for analysis by finding September 5-day mean maximum temperature drops which are approximately equivalent in character. 2) establish 5-day mem sea-level pressures and variances of pressures for these homogeneous samples. These sere computed for a grid of 126 points covering the entire northern hemisphere mid-latitude portion of the western hemisphere. 3) establish the geographic areas where these means are significant by comparing them statistically with a random set of 5-day mean sea-level pressures and variances. 4) establish the extent to which the significant 5-day running mean sea-level pressures vary from a commonly recognized norm.

Comments

Includes bibliographical references (pages [112]-113)

Extent

ix, 113 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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