Results 241 to 250 of about 17,805,085 (289)

Sources of low-level wind shear around airports

Journal of Aircraft, 1977
Some potential sources of low-level wind shear in and around airports and their likely effects are probed and analyzed. Wind shear over flat terrain with near-homogeneous surface properties (roughness, specific heat), the turning layer, shear flows over inhomogeneous terrain (airport + urban areas), thunderstorms, turbulent flowfields over bluff bodies
George H. Fichtl, Dennis W. Camp, Walter Frost   +2 more
openaire   +1 more source

Airborne infrared low level wind shear predictor

22nd Aerospace Sciences Meeting, 1984
The operating principles and test performance of an airborne IR (13-16 micron) temperature-sensing detection and warning system for low-level wind shear (LLWS) are presented. The physics of LLWS phenomena and of the IR radiometer are introduced. The cold density-current outflow or gust front related to LLWS is observed in the IR spectrum of CO2 by a ...
P. KUHN, R. KURKOWSKI
openaire   +1 more source

Airborne Detection of Low-Level Wind Shear

Journal of Aircraft, 1979
Recent studies of accidents/inc idents attributed to wind shears encountered during takeoff or landing approach have indicated the necessity of quantifying the combined effect of downdraft and horizontal shear. This paper discusses the development of a system to compute and display to the flight crew this loss of performance capability.
openaire   +1 more source

Does Low-level Vertical Wind Shear Matter for Hail Production?

2023
<p>Vertical wind shear (or more precisely, bulk wind vector magnitude differences between specified altitudes) has long been used for severe convective storm science and forecasting, in part owing to its relative success in correlating to various storm behaviors and hazards.
Matthew Kumjian, Kelly Lombardo, Cameron Nixon, John Allen   +3 more
openaire   +1 more source

Low-level wind shear detection and warning - A systems update

21st Aerospace Sciences Meeting, 1983
The aim of the Joint Airport Weather Studies (JAWS) project, to determine quantitatively how well various low-level wind shear detection and warning systems operate in a uniform wind shear environment, is discussed. A number of low-level wind shear detection and warning systems that were used in the JAWS field project in the summer of 1982 are briefly ...
J. MCCARTHY, J. WILSON
openaire   +1 more source

Lake-Size Dependency of Wind Shear and Convection as Controls on Gas Exchange [PDF]

Geophysical Research Letters, 2012
High‐frequency physical observations from 40 temperate lakes were used to examine the relative contributions of wind shear (u*) and convection (w*) to turbulence in the surface mixed layer.
Donald C. Pierson, Chin H Wu, Justin Brookes   +2 more
exaly   +2 more sources

Radar Detection of Low-Level Wind Shear

2001
Another chapter of my life after NASA concerns the invention and patent on a method of using the conventional airport surveillance radar (ASR-9) to detect hazardous low-level wind shear (131). Prior to mid-1988, wind shear had been responsible for twelve major aircraft accidents, seven of which resulted in the loss of 575 lives.
openaire   +1 more source

Airborne operation of an infrared low-level wind shear prediction system

Journal of Aircraft, 1982
Airborne testing under simulated and actual low-level wind shear conditions is underway on a NASA-Ames Learjet. An infrared CO2 band radiometer with a forward 'look distance' of 5 to 8 kilometers measures the air temperature weighted to this range ahead of the approach configured aircraft.
P. KUHN, R. KURKOWSKI, F. CARACENA
openaire   +1 more source

Numerical Simulation of Flow over an Airport During A Low-level Wind Shear Event

Journal of Aerospace Sciences and Technologies, 2023
In this paper we present the flow features of a severe low-level wind shear event near an airport simulated using a high-resolution numerical weather prediction model. The open-source model Weather Research and Forecasting (WRF) was used for the numerical simulations.
C. Arshad Shameem, J. Saravanakumar, T.N. Venkatesh   +2 more
openaire   +1 more source

Characterization of Low-Level Wind Shear Induced by Convective Weather

Advances in Sciences
This paper analyzes the wind shear during 16 convective weather events in 2021 using conventional observation data and NCEP reanalysis data, NECP reanalysis data, Doppler radar wind profile radar data, and laser wind radar data, and classifies them into three categories, namely, wind shear induced by the outflow of thunderstorms, wind shear induced ...
Jia Pan, Liang Feng
openaire   +1 more source