NASA Technical Reports Server (NTRS) : Characteristics pdf

NASA Technical Reports Server (NTRS) : Characteristics

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This study examines the influence of ambient vertical wind shear on microburst intensity, asymmetry, and translation. Results show that microburst asymmetry is influenced by the magnitude of the low-level ambient vertical shear. The microburst outflow elongates in the direction of the shear vector (which is not necessarily in the direction of translation), and generates the greatest hazard (for commercial jet transports) along paths orthogonal to the shear vector. The model results also show that the asymmetry increases with increasing shear magnitude. One implication of these results concerns the detection of a microburst by a ground-based doppler systems. These systems may underestimate the hazard for landing and departing aircraft that are on trajectories orthogonal to both the sensor beam and shear vector, especially if the magnitude of the shear is large. Another implication is that microburst are more likely to be asymmetrical in regions (seasons) where there is climatologically a significant low-level shear.

The model results also show that the rotor microbursts and severe wind damage can be a product of the microburst interaction with strong ambient wind shear

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 7/1/1994
• Year: 1994
• Book Topics/Themes: NASA Technical Reports Server (NTRS), AVIATION METEOROLOGY, FLIGHT HAZARDS, MICROBURSTS (METEOROLOGY), WIND EFFECTS, WIND SHEAR, COMPUTERIZED SIMULATION, DOPPLER RADAR, MATHEMATICAL MODELS, RADAR DETECTION, Proctor, Fred H

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