Date of Award


Document Type


Degree Name

Master of Science (MS)


Atmospheric Science

Committee Chair

Kevin Knupp

Committee Member

John Mecikalski

Committee Member

Udaysankar Nair


Severe storms--Forecasting., Tornadoes--Forecasting.


The Weather Forecasting Model (WRF) was used to study boundary layer evolution in addition to analyzing the propagation mode of a nocturnal QLCS that moved through northern Alabama on March 9-10, 2017. Two comprehensive profiling systems separated by 59 km were utilized to evaluate the simulated boundary layer characteristics during this time period. The model had good accuracy with timing and structure of the QLCS, but was less accurate with simulating the evolution of the boundary layer from daytime to nighttime. Problems with the simulation included low level stability within the boundary layer (elevated CAPE for both observations and model), and insufficient parameterization of surface properties (e.g., surface fluxes, and wind speed). 0-1 km Storm Relative Helicity was underestimated, but that is to be expected given a nonlocal boundary layer parameterization scheme will smooth out wind profiles in a high wind environment.



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