scholarly journals Severe convection-related winds in Australia and their associated environments

2021 ◽  
Author(s):  
Andrew Brown ◽  
Andrew Dowdy
Keyword(s):  
Severe Convection

Examining Terrain Effects on an Upstate New York Tornado Event Utilizing a High-Resolution Model Simulation

2021 ◽  
Author(s):  
Luke J. LeBel ◽  
Brian H. Tang ◽  
Ross A. Lazear
Keyword(s):  
New York ◽  
High Resolution ◽  
Wind Shear ◽  
Model Simulation ◽  
Wrf Model ◽  
Severe Weather ◽  
Streamwise Vorticity ◽  
Low Level ◽  
Severe Convection ◽  
The Impact

AbstractThe complex terrain at the intersection of the Mohawk and Hudson valleys of New York has an impact on the development and evolution of severe convection in the region. Specifically, previous research has concluded that terrain-channeled flow in the Mohawk and Hudson valleys likely contributes to increased low-level wind shear and instability in the valleys during severe weather events such as the historic 31 May 1998 event that produced a strong (F3) tornado in Mechanicville, New York.The goal of this study is to further examine the impact of terrain channeling on severe convection by analyzing a high-resolution WRF model simulation of the 31 May 1998 event. Results from the simulation suggest that terrain-channeled flow resulted in the localized formation of an enhanced low-level moisture gradient, resembling a dryline, at the intersection of the Mohawk and Hudson valleys. East of this boundary, the environment was characterized by stronger low-level wind shear and greater low-level moisture and instability, increasing tornadogenesis potential. A simulated supercell intensified after crossing the boundary, as the larger instability and streamwise vorticity of the low-level inflow was ingested into the supercell updraft. These results suggest that terrain can have a key role in producing mesoscale inhomogeneities that impact the evolution of severe convection. Recognition of these terrain-induced boundaries may help in anticipating where the risk of severe weather may be locally enhanced.

scholarly journals Advances in Severe Convection Research and Operation in China

2020 ◽  
Vol 34 (2) ◽  
pp. 189-217
Author(s):  
Xiaoding Yu ◽  
Yongguang Zheng
Keyword(s):  
Severe Convection

scholarly journals Progress toward developing a practical societal response to severe convection (2005 EGU Sergei Soloviev Medal Lecture)

2005 ◽  
Vol 5 (5) ◽  
pp. 691-702 ◽  
Author(s):  
C. A. Doswell
Keyword(s):  
Convective Storms ◽  
Temporal Specificity ◽  
Severe Convection ◽  
Societal Response ◽  
Critical Issues ◽  
The Usa ◽  
Degree Of Certainty ◽  
Funding Support ◽  
Spatio Temporal ◽  
Made In

Abstract. A review of severe convection in the context of geophysical hazards is given. Societal responses to geophysical hazards depend, in part, on the ability to forecast the events and the degree of certainty with which forecasts can be made. In particular, the spatio-temporal specificity and lead time of those forecasts are critical issues. However, societal responses to geophysical hazards are not only dependent on forecasting. Even perfect forecasts might not be sufficient for a meaningful societal response without the development of considerable infrastructure to allow a society to respond properly and in time to mitigate the hazard. Geophysical hazards of extreme magnitude are rare events, a fact that tends to make funding support for appropriate preparations difficult to obtain. Focusing on tornadoes as a prototypical hazard from severe convective storms, the infrastructure for dealing with them in the USA is reviewed. Worldwide implications of the experience with severe convective storms in the USA are discussed, with an emphasis on its relevance to the situation in Europe.

Nowcasting severe convection in the Alpine region: the COALITION approach

2013 ◽  
Vol 140 (682) ◽  
pp. 1684-1699 ◽  
Author(s):  
L. Nisi ◽  
P. Ambrosetti ◽  
L. Clementi
Keyword(s):  
Alpine Region ◽  
Severe Convection

scholarly journals A Lightning Parameterization for the ECMWF Integrated Forecasting System

2016 ◽  
Vol 144 (9) ◽  
pp. 3057-3075 ◽  
Author(s):  
Philippe Lopez
Keyword(s):  
Atmospheric Chemistry ◽  
Convective Available Potential Energy ◽  
Horizontal Resolution ◽  
Cloud Base ◽  
Lightning Flash ◽  
Severe Convection ◽  
Forecasting System ◽  
Total Lightning ◽  
Optical Transient ◽  
Cloud Base Height

A new parameterization able to diagnose lightning flash densities is proposed for the ECMWF Integrated Forecasting System, including its tangent-linear and adjoint versions. Total lightning densities are expressed as a function of hydrometeors contents, convective available potential energy, and cloud-base height output by the convective parameterization. Potential future applications range from the computation of NOx emissions by lightning in atmospheric chemistry models, severe convection forecasting, and data assimilation. In this study, a decade-long experiment is used to calibrate the simulated global annual mean flash density against the LIS/Optical Transient Detector (OTD) climatological value. On the seasonal and continental scales, the new parameterization is shown to agree well with the LIS/OTD observations. In forecast mode, output lightning densities are found to be almost independent of the horizontal resolution used in the model. Decade-long experiments also show that the new parameterization gives better results overall than the main existing lightning parameterizations designed for global models. Sensitivity experiments using its adjoint version are also performed to assess its potential for the future assimilation of lightning observations in the ECMWF 4D-Var system.

scholarly journals The cyclonic activity and frequency of dangerous weather phenomena over the territory of Belarus

2019 ◽  
pp. 79-93
Author(s):  
Katsiaryna M. Sumak ◽  
Inna G. Semenova
Keyword(s):  
Heavy Rain ◽  
Weather Conditions ◽  
Summer Period ◽  
Severe Convection ◽  
Weather Events ◽  
Atmospheric Fronts ◽  
Significant Damage ◽  
Wet Snow ◽  
The Republic ◽  
The Impact

In recent decades in the world, and in the Republic of Belarus in particular, the question of the impact of weather conditions on the development of sectors of the economy and life of the population has become acute. The sudden changes in weather conditions can lead to adverse and dangerous weather phenomena that cause significant damage to the country’s economy. This paper examines the frequency of dangerous weather phenomena in cyclones of different trajectories that moved through the territory of the Republic of Belarus during the period of 1995–2015. It is identified that southern and western cyclones caused dangerous weather events over the territory of Belarus. The interannual and seasonal frequency of cyclones causing dangerous weather phenomena in Belarus was analyzed. It is shown that the largest number of southern and western cyclones was characteristic mainly for the summer period, as well as the transitional seasons of the year, therefore the dangerous weather phenomena were associated mainly with the development of severe convection on atmospheric fronts. Such phenomena as very heavy rain, snowfall and wind had the highest frequency in cyclones, as in southern as western trajectories. The share of strong sticking of wet snow and large hail were isolated cases and these phenomena were recorded locally over the territory of country.

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