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Now showing items 21-30 of 143
Convection Initiation By Heterogeneous Great Plains Low-Level Jets
(2017)
Nocturnal convection is a common feature of the Great Plains region. Forecasting this convection, however, is challenging, as the processes leading up to convection initiation (CI) can be subtle. It has been discussed in ...
Low-level Stability Analysis of Observed Supercell Environments
(2022-08)
Lapse rates have long been used to quantify the stability of the environment and aid in the prediction of storms. Low level lapse rates (0-1 km and 0-3 km) specifically have become a tool in understanding the finer processes ...
Scale-dependent Inflation for Multiscale Ensemble based Data Assimilation
(2023-12-15)
The degree of the background ensemble deficiency, often manifested as ensemble underdispersion, can vary at different scales in the ensemble-based data assimilation. This study develops the new scale-dependent inflation ...
Multi-Radar Analysis of the 20 May 2013 Moore, Oklahoma Supercell through Tornadogenesis and Intensification
(2019-12-13)
On 20 May 2013, a violent, long-track EF-5 tornado impacted Moore, Oklahoma and surrounding areas, occurring within a network of radars operating in close proximity to the supercell. This network of radars consisted of ...
A Multi-Resolution Ensemble Hybrid 4DEnVar with Variable Ensemble Sizes to Improve Global and Tropical Cyclone Track Numerical Prediction
(2022-05)
One challenge associated with ensemble-based data assimilation (DA) is the quantitative estimation of the background error covariances. In the current global operational DA system, a reduced resolution background ensemble ...
Modulation of Rainfall by the South American Altiplano Lakes
(2005)
Rainfall over the South American altiplano is modulated via mesoscale circulations induced by diverse land-surface contrasts present over the region. Nocturnal convective storms observed over Lake Titicaca represent 55% ...
ATMOSPHERIC VARIATIONS IN COLUMN INTEGRATED CO2 ON SYNOPTIC AND SEASONAL TIME SCALE OVER THE U.S.
(2018)
Past studies have demonstrated that synoptic events play an important role in the spatial and temporal variations of carbon dioxide (CO2). In this study, in order to investigate whether cold fronts have impact on synoptic ...
Evaluation of the experimental warn-on-forecast system and WoF-hybrid 3DEnVar system on short-term forecasts for 2021 real-time cases
(2022-12-16)
Over the last few decades, it has become more important than ever to provide accurate forecasts for severe hazards that have become more common due to climate change effects. Over this time, several forecasting experiments ...
Doppler Radar Analyses of Tornadic Supercells on 19 May 2013
(2016-05-13)
On 19 May 2013, two supercells moved through central Oklahoma and produced seven tornadoes, including one of EF-3 and one of EF-4 intensity. High temporal and spatial resolution observations were collected in both strong ...
Rapid-scan, polarimetric, mobile, Doppler-radar observations of the formation, evolution, and structure of the El Reno tornado of 31 May 2013
(2016-10)
On 31 May 2013, the mobile, Rapid-scan, X-band, Polarimetric (RaXPol) radar collected a high spatial and temporal resolution dataset documenting the genesis, intensification, and dissipation of a tornado that caused EF-3 ...