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Now showing items 41-50 of 58
Understanding and Predicting Nocturnal Convection Initiation using an Ensemble-based Multi-scale Data Assimilation System
(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 ...
Inferring Bulk Microphysical Characteristics of Mesoscale Convective Systems Using Polarimetric Radar Observations
(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 ...
Using Machine Learning Applications and HREFv2 to Enhance Hail Prediction for Operations
(2019-08)
In this thesis, I demonstrate how hail prediction can be improved through post-processing numerical weather prediction (NWP) data from the new High-Resolution Ensemble Forecast system version 2 (HREFv2) with machine learning ...
SIMULTANEOUS ASSIMILATION OF RADAR AND SATELLITE DATA FOR CONVECTIVE SCALE NWP USING HYBRID ENSEMBLE VARIATIONAL DATA ASSIMILATION APPROACH
(2017)
Recently, an ensemble of the three-dimensional variational data assimilation (En3DA) system has been developed based on Advanced Regional Prediction System (ARPS) three-dimensional variational (3DVar) data assimilation ...
Boundary Layer Profiling Using Rotary-Wing Unmanned Aircraft Systems: Filling the Atmospheric Data Gap
(2018-08)
The planetary boundary layer (PBL) is comprised of energy exchanges with the Earth’s surface, and as such plays a large factor in the evolution of weather con- ditions. However, traditional methods of observing the atmosphere, ...
Assessing the Impact of Non-Conventional Observations on High-Resolution Analyses and Forecasts
(2017-05)
A key recommendation of a 2009 report by the National Research Council (NRC) was for new mesoscale networks to be integrated with existing ones to form a nationwide “network of networks”. This recommendation originated ...
Environmental Conditions Producing Thunderstorms with Anomalous Vertical Polarity of Charge Structure
(2018-05)
Electric field soundings and Lightning Mapping Arrays have confirmed the existence of thunderstorms with vertical charge structure that is inverted from the usual polarity. This inverted charge structure can be described ...
Tornado proximity soundings from the NCEP/NCAR reanalysis data
(2002)
Thermodynamic soundings have been constructed from the reanalysis dataset produced by the National Centers for Environmental Prediction (NCEP) and the National Center for Atmospheric Research (NCAR). This was done to expand ...
A Sub-daily Severe Weather Climatology and Its Implications for Forecasting
(2017-05)
While there has been an abundance of research dedicated to the seasonal climatology of severe weather, very little has been done to study hazardous weather probabilities on smaller scales. Using a similar process to the ...
Using Machine Learning to Predict Damaging Straight-line Convective Winds
(2016-08-12)
Thunderstorms, including straight-line (non-tornadic) winds, cause an average of over 100 deaths and $10 billion of insured damage per year in the United States. In the past decade machine learning has led to significant ...