Results 81 to 90 of about 123 (102)

Downslope Windstorms in the Lee of Ridges on Mars

Icarus, 1995
Abstract The semianalytical theory of downslope windstorms, originally developed to understand large increases in surface winds in the lee of major mountain chains on Earth, such as the famous windstorms in Boulder, Colorado, is applied to martian conditions.
Julio A. Magalhāes, Richard E. Young
openaire   +1 more source

The Origin of Severe Downslope Windstorm Pulsations

Journal of the Atmospheric Sciences, 1990
Abstract Recently reported Doppler lidar observations of the downslope component of flow velocity made during the occurrence of a mountain windstorm at Boulder, Colorado, have established that such storms are characterized by an intense pulsation of windspeed with characteristic period(s) near 10 minutes.
W. R. Peltier, J. F. Scinocca
openaire   +1 more source

Doppler Lidar Observations of a Downslope Windstorm

Monthly Weather Review, 1988
Abstract During January and February 1987, the NOAA/WPL pulsed Doppler lidar was deployed in the foothills west of Boulder, Colorado, to study orographically induced flows over the Continental Divide. On 29 January 1987, the lidar, with its unique spatial and temporal data-gathering capabilities, documented a downslope windstorm affecting the Boulder ...
Paul J. Neiman, R. M. Hardesty, M. A. Shapiro, R. E. Cupp   +3 more
openaire   +1 more source

Statistical Modeling of Downslope Windstorms in Boulder, Colorado

Weather and Forecasting, 2008
Abstract Downslope windstorms are of major concern to those living in and around Boulder, Colorado, often striking with little warning, occasionally bringing clear-air wind gusts of 35–50 m s−1 or higher, and producing widespread damage.
Howard B. Bluestein, Michael B. Richman, Andrew E. Mercer, John M. Brown   +3 more
openaire   +1 more source

Examples of the role of surface friction in downslope windstorms

Meteorology and Atmospheric Physics, 1990
Numerical simulations of four mountain wave events over the Colorado Rockies were carried out with a two-dimensional hydrostatic model including a turbulent mixing parameterization in order to investigate the effect of surface friction. Surface friction was found to play a major role in modulating and even in some cases preventing the wave ...
Richard, Evelyne, Mascart, Patrick
openaire   +3 more sources

On the Sensitivity of Downslope Windstorms to the Asymmetry of the Mountain Profile

Journal of the Atmospheric Sciences, 1991
Abstract The influence of terrain asymmetry on the development and strength of downslope windstorms was examined through the numerical simulation of three basic atmospheric configurations: 1) flow beneath a mean-state critical layer, 2) flow in the presence of breaking waves and 3) flow in a two-layer atmosphere without wave breaking or a mean-state ...
Peter P. Miller, Dale R. Durran
openaire   +1 more source

Effects of Mountain Width on Downslope Windstorm Occurrence

Journal of the Atmospheric Sciences
Abstract This study demonstrates the impact of mountain width on the occurrence of downslope windstorms by deriving a solution for 2D flow past an idealized mountain range, including nonhydrostatic effects. Additionally, idealized numerical simulations were conducted to validate the solution.
Yuki Asano, Hiroyuki Kusaka
openaire   +1 more source

Downslope Windstorms. Part II: Effect of External Wind Shear

Journal of the Atmospheric Sciences, 1992
Abstract The nonlinear, two-dimensional, steady-state, mesoscale problem of a stable stratified airflow above a mountain ridge is considered. The influence of turbulence is disregarded. It is assumed that the atmosphere above this flow is neutral and perturbations of the pressure in it are small.
Lev N. Gutman, I. Apterman
openaire   +1 more source

Effects of Inversion Height and Surface Heat Flux on Downslope Windstorms

Monthly Weather Review, 2011
Abstract Simulations are presented focusing on the role of temperature inversions in controlling the formation and strength of downslope wind storms. Three mechanisms are examined depending on the relative height of the inversion with respect to the mountain and the stability of vertically propagating mountain waves.
Eric D. Skyllingstad, Craig M. Smith
openaire   +1 more source

A multi-scale simulation of an extreme downslope windstorm over complex topography

Meteorology and Atmospheric Physics, 2000
A severe localized windstorm, with near-surface winds > 60 ms−1, occurred in an isolated valley within the Alpine mountains (> 1800 m) of central Norway on 31 January 1995. A multi-scale numerical simulation of the event was performed with the Naval Research Laboratory (NRL)’s Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS), configured ...
J. D. Doyle, M. A. Shapiro
openaire   +1 more source