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Showing 1 to 20 of 44 for “"Weather Research and Forecasting (WRF) Model"”.
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A flood preparedness tool for Chicago: Weather Research and Forecasting (WRF) model downscaling to improve rainfall forecasts and flood mitigation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Application of the Weather Research and Forecasting (WRF) Model to Simulate a Squall Line: Implications of Choosing Parameterization Scheme Combinations and Model Initialization Data Sets
… through the Ohio Valley resulting in four deaths and one injury. Such events highlight the importance of accurate forecasting for public safety. Mesoscale Modeling plays an important role in any forecast of a potential squall line. The focus of this study was to examine the performance of several …
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Assimilation of lightning data by nudging tropospheric water vapor and applications to numerical forecasts of convective events
… events on 29 June 2012, 17 November 2013, and 19 April 2011 as well as an ensemble forecast of the 29 June 2012 event using the Weather Research and Forecasting (WRF) model. Lightning data are assimilated over the first 3 hours of the forecasts, and the subsequent impact on forecast quality …
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The assimilation of surface observations in the European Alpine region
… dissertation presents the development, testing and refinement of an operational Numerical Weather Prediction (NWP) routine based on the Weather Research and Forecasting (WRF) model for a domain encompassing the European Alps. Surface observations from official observational networks and …
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Stratospheric Influence On The Breakdown Of A January 2009 Blocking Episode
In previous research on atmospheric blocking the interest has primarily been on the onset of blocking. To fully understand a blocking episode, the end, or breakdown, must also be investigated. The focus of this research was to examine the dynamics of block breakdown, with special notice to the …
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Source air feeding convection within a nocturnal mesoscale convective system during the evolution from surface-based to elevated convection
… overnight hours, producing severe surface winds and severe hail. This study investigates the elevation above ground level (AGL) from which air parcels with the greatest convective available potential energy (CAPE) originate and support the development and maintenance of elevated convection. The …
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Land Cover Change and its Impacts on a Flash Flood-Producing Rain Event in Eastern Kentucky
… a 35-county region that is a part of the Cumberland Plateau of the Appalachian Mountains. With mountaintop removal and associated land cover change (LCC) (primarily deforestation), it is hypothesized that there would be changes in various atmospheric boundary layer parameters and precipitation. …
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Investigating Climate Impacts of Urbanization and the Potential for Cool Roofs to Mitigate the Kansas City Metropolitan Area’s Urban Heat Island Effect
An urban heat island (UHI) is a phenomenon where the temperatures within cities are greater than those of surrounding rural areas due to human activity and physical properties of urban surfaces. This effect can cause the annual mean temperature within cities to be up to 3oC more than its …
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Experimental and numerical investigation of turbulence in Stable Boundary Layer flows
The present work combines experimental and numerical analyses to improve current understanding of turbulence in stably stratified flows. An extensive literature review is presented on the mechanisms governing turbulence under stratified conditions, with a special focus on the Richardson number …
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Orographic Precipitation Over the Island of Oahu
… relationship between orographic vertical motion and precipitation, a linear diagnostic upslope model has been developed to provide a high-resolution picture of terrain induced vertical motion and precipitation over the Island of Oahu. The model is called the Hawaiian Orographic Precipitation …
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Adapting to Extreme Heat: Social, Atmospheric, and Infrastructure Impacts of Air Conditioning in Megacities - The Case of New York City
<p>Extreme heat events are becoming more frequent and intense in most large cities. Built-up surfaces also limit cooling mechanisms, leading to warmer conditions in cities, a phenomenon called the Urban Heat Island (UHI). This presents major challenges to reduce adverse health effects of hot …
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Numerical modelling of Tropical Cyclone Dineo and its rainfall impacts over north-eastern South Africa
… in the Mozambique Channel on 12 February 2017 and made landfall over the south-central coast of Mozambique on 15 February. This study investigates the atmospheric circulation and potential mechanisms responsible for the heavy rainfall that occurred during the passage of ex-Tropical Cyclone …
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A numerical simulation of tropical storm Chedza over south-eastern Africa
… flooding over parts of Malawi, Mozambique, and Madagascar occurred in January 2015. An impact assessment by the World Bank indicated huge damage to property, infrastructure, and agriculture over several regions in south-eastern Africa. The flooding was associated with tropical storm Chedza …
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Data assimilation and dynamical downscaling of remotely-sensed precipitation and soil moisture from space
… has provided invaluable information for understanding the land-atmosphere water and energy exchanges. However, the use of satellite observations in hydrologic applications is often limited by coarse space-time resolutions. This study aims to develop a data assimilation system that integrates …
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Climate change and hazardous convective weather in the United States: Insights from high-resolution dynamical downscaling
<p>Global climate model (GCM) projections increasingly suggest that large-scale environmental conditions favorable for hazardous convective weather (HCW) may increase in frequency in the future due to anthropogenic climate change. However, this storm environment-based approach is undoubtedly …
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Regional flow conditions associated with stratocumulus cloud-clearing events over the southeast Atlantic
… are rapidly eroded along a line hundreds–to–thousands of kilometers in length that generally moves westward away from the African coast. Because marine stratocumulus clouds exert a strong cooling effect on the planet, any phenomenon that acts to erode large areas of low clouds may be climatically …
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On the Understanding of the Coastal-Urban Nexus of Weather, Air Quality and Energy
… processes, building energy consumption, and air quality, particularly during periods of seasonal extremes such as summer ozone peaks and winter heating. Accurate representation of these interactions in urban modeling is crucial for understanding and addressing air pollution and energy …
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Improving Convective Permitting Model Simulations of Extreme Precipitation using Object-Based Tracking and Data Assimilation
… of mesoscale convective system (MCS) tracking and forecasting during severe weather episodes over the central and southern US using high-resolution numerical simulation and advanced data assimilation.In Appendix A, we evaluate the performance of a km-scale (e.g. 1.8 km) convective-permitting …
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North American monsoon precipitation and its precursors: processes at the seasonal and diurnal scale
The Weather Research and Forecasting (WRF) model was run at 100~km, 25~km, and 10~km resolution for the 2000 and 2004 monsoon seasons (July-September), a dry year and a wet year. These years were chosen to represent contrasting precipitation outcomes to assure that results were robust across …
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Structure of an east coast cyclone derived from airborne radar and model diagnostics
Data from airborne W-band radar along with Weather Research and Forecasting (WRF) Model thermodynamic fields and air-parcel back trajectories from the HYSPLIT model are used to determine causes of finescale features of a northeast U.S. cyclone and link them to synoptic and air mass structure. The …
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