Results 261 to 270 of about 121,329 (305)

AC 00-50: Low Level Wind Shear

1976
This Advisory Circular is intended to provide guidance for recognizing the meteorological situations that produce the phenomenon widely known as low level wind shear. It describes both preflight and in-flight procedures for recognizing this phenomenon as well as pilot techniques that minimize its effects on takeoffs and serve to preclude short or long ...
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A LIDAR LOW-LEVEL WIND SHEAR WARNING ALGORITHM BASED ON THE LEAST SQUARE FITTING

Meteorologiya i Gidrologiya, 2023
In order to detect the low-level wind shear at different scales accurately and efficiently, a lidar low-level wind shear warning algorithm is proposed based on least square fitting. First, the extracted reconstructed headwind profile is extended, and the least square curve fitting (polynomial fitting) is performed by using the extended data.
W. SHI, Q. ZHANG, W. BO, J. WAN, J. CHENG, J. GONG, Q. ZHAO   +6 more
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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
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AC 00-50A: Low Level Wind Shear

1979
This advisory circular is intended to provide guidance for recognizing the meteorological situations that produce the phenomenon widely known as low level wind shear. It describes both preflight and in-flight procedures for detecting and predicting this phenomenon as well as pilot techniques that minimize its effects when inadvertently encountered on ...
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Low level wind shear and baroclinic growth of monsoon depression scale waves

Meteorology and Atmospheric Physics, 1986
A quasi-geostrophic, linear stability analysis was carried out to find the effect of low level wind shear on the baroclinic growth of monsoon depression scale waves. The low level wind shear of the mean monsoon flow is altered by varying the surface wind, the position and the magnitude of the westerly maximum.
P. S. Salvekar, L. George, S. K. Mishra
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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
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Enhancing Low-level Wind Shear Alert System (LLWAS) to Predict Low-level Wind Shear (LLWS) Phenomenon Using Temporal Convolutional Network

2021 8th International Conference on Electrical Engineering, Computer Science and Informatics (EECSI), 2021
Muhammad Ryan, Adhi Harmoko Saputro, Ardhasena Sopaheluwakan   +2 more
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Quickly Sample and Reconstruct for Low-level Wind Shear Data Measured by Coherent Lidar

2019 IEEE 2nd International Conference on Electronic Information and Communication Technology (ICEICT), 2019
Low-level wind shear is a type of catastrophic weather that can cause aircraft to flip over, stall or even crash. Therefore, it is very important to detect and recognize this phenomenon. In recent years, coherent Lidar has been proposed to detect low-level wind shear, but the common recognition methods need large computation to inverse the wind field ...
Yuechao Ma, Sining Li, Wei Lu
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Low-cost cw CO 2 lidar system for low-level wind shear detection

SPIE Proceedings, 1990
A CW CO2 lidar sytem developed to determine the feasibility of using such a system for detecting and measuring low-level wind shear is discussed. The system was constructed from off-the-shelf components at a relatively low cost. Results of preliminary testing of the system are included.
Gregory J. Fetzer, Madison J. Post
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Note on Observed Vertical Wind Shear at Low Levels Over the Ocean

Bulletin of the American Meteorological Society, 1953
A statistical analysis is presented of anomalous vertical wind shear with height from the surface to 1000 and 2000 feet over the ocean. Mention is made of unusual wind effects on the sea surface as a phenomenon that appears to be related to varying wind profiles, dependent upon oceanographic and meteorological conditions.
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