Browsing OU - Theses by Author "Parsons, David"
Now showing items 1-12 of 12
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A 20-Year Survey of Short-Duration Extreme Rainfall Events from Summertime Convection Over the Central and Eastern United States: Climatology, Trends, and Meteorological Patterns
Chiappa, Jason (2023-12-15)Short-duration extreme rainfall events (EREs) caused by convection are often associated with flash flooding, which can have devastating impacts on society. An increase in the frequency and intensity of EREs has been ... -
A comparison of microphysical parameterization sensitivities in three comma-head snow events and evaluation of scheme solutions with PIREPs
Cassady, Kristen (2013)Numerical model experiments are conducted to assess how aircraft icing forecasts are affected by the choice of microphysical parameterization, with respect to the presence of supercooled liquid water (SLW). Select winter ... -
Atmospheric Conditions Preceeding Very Rapid Sea Ice Loss Events
Frank, Madeline Clark (2019)Even though the observed amplified warming trend in the Arctic region is well-established in theory through climate feedbacks and reproduced in global climate model projections, the same global climate models underestimate ... -
Characteristics and Lifecycles of Anticyclonic Tropopause Polar Vortices
Burzdak, Joseph (2023-05-12)Tropopause polar vortices (TPVs) are sub-synoptic, long-lived, closed circulation features located in the upper-troposphere and lower-stratosphere region. Although TPV circulations can be cyclonic or anticyclonic, most ... -
Evolution of the Structure and Dynamics of the Nocturnal Low-Level Jet after the Passage of a Cold Front and Insights into the Initiation and Maintenance of Nocturnal Convection
Rattray, Christopher (2021)Nocturnal low-level jets (NLLJs) are commonly observed over the Southern Great Plains (SGP) and have been linked to occurrence of the nocturnal maximum in mesoscale convective systems over this region during the late spring ... -
Exploring CopterSonde Use for National Weather Service Operations
Bruce, Connor (2023-05-12)The CopterSonde is a state of the art sampling platform that can be used to advance the field of meteorology in operational forecasting and data collection. One capability of the CopterSonde is that it can collect ... -
Inferring Bulk Microphysical Characteristics of Mesoscale Convective Systems Using Polarimetric Radar Observations
Handler, Shawn (2017)In 2013, the network of NEXRAD WSR-88D’s were upgraded to dual-polarization. Dual-polarization allows for the identification of particle shape, size, orientation, and concentration within a radar sample volume due to the ... -
Investigating Arctic Cyclone-Tropopause Polar Vortex Interactions with Observing System Simulation Experiments
Bray, Matthew (2023-05-12)Tropopause polar vortices (TPVs) are upper-level cyclonic circulations that are common in high latitudes. TPVs most directly impact weather at the surface by providing baroclinic forcing for the development of Arctic ... -
Kinematics, Thermodynamics, and Microphysics of the 25-26 June 2015 Kansas MCS during PECAN
Miller, Rachel (2018-05)This case study analyzes a nocturnal mesoscale convective system (MCS) that was observed in northeast Kansas as part of the Plains Elevated Convection at Night (PECAN) field experiment on 25-26 June 2015. Over the course ... -
Nocturnal Ascent and Low-Level Jet in a Baroclinic Zone
Gomes, Matheus (2022-05)A remarkable feature of the regional climatology of the central United States and the Great Plains is the existence of a nocturnal maximum in convective rainfall during the warm season. This study follows up the work of ... -
The Response of a Long-lived Mesoscale Convective System to Changes in Lower-Tropospheric Conditions
Chasteen, Manda (2017-05)Most continental regions experience an afternoon or evening maximum of convective activity, which is dominated by convection driven by surface heating. However, the Great Plains of North America experiences a nocturnal ... -
Understanding and Predicting Nocturnal Convection Initiation using an Ensemble-based Multi-scale Data Assimilation System
Degelia, Samuel (2016-08-12)A nocturnal maximum in precipitation exists over the Great Plains during the summer. The initiation of nocturnal storms is notoriously difficult to forecast in numerical models due to the storms often involving interactions ...