Theses and Dissertations


A Climatological and Thermodynamic Analysis of Severe Squall Lines in the Lower Mississippi River Valley


Ryan Wade

Issuing Body

Mississippi State University


Brown, Michael E.

Committee Member

Rodgers, John C., III

Committee Member

Wax, Charles L.

Date of Degree


Original embargo terms

MSU Only Indefinitely

Document Type

Graduate Thesis - Open Access

Degree Name

Master of Science


College of Arts and Sciences


The squall line is generally accepted to be the most commonly observed mesoscale convective system (MCS). Squall lines in the Southeastern United States account for a considerable amount of the total severe weather observed in this region (48%), including the production of localized severe wind events (known as Bow Echoes and Downbursts), long-lived severe wind events (known as Derechoes), as well as tornadoes. This study is the beginning of a baseline severe squall line climatology for the county warning areas (CWAs) of the National Weather Service Forecast Offices (NWSFO) located in Jackson, MS and Memphis, TN. This climatology will focus on the seasonal distribution of severe weather events associated with squall lines, as well as the thermodynamic forcing associated with the initiation and life spans of severe squall lines in Mississippi and West Tennessee.


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