Accession Number:

ADA164939

Title:

A Study of the Methodology of Low-Altitude Wind Shear Detection with Special Emphasis on the Low Level Wind Shear Alert System Concept.

Descriptive Note:

Final rept. Oct 83-Jul 85,

Corporate Author:

NATIONAL CENTER FOR ATOMSPHERIC RESEARCH BOULDER CO JOINT AIRPORT WEATHER STUDIES

Personal Author(s):

Report Date:

1986-02-01

Pagination or Media Count:

112.0

Abstract:

This basic principles study of the Low Level Wind Shear Alert System LLWAS addresses the question of the degree to which a change of algorithm and network geometry can improve the performance of an anemometer-based wind shear detection system to an acceptable level. The performance of the current system seems to be deficient in that it is ineffective for the detection of microburst and tha it issues many alarms in situations where pilots do not experience hazardous wind shear. The theoretical basis for this investigation is simulation testing. This process involves testing each combination of algorithm and geometry against a realistic mathematiclly generated weather model that includes wind shear events. The binary time series of eventno event and detectionno detection are computed and the systems that exhibit the best skill are determined. The systems that have the best skills have high probabilities of detection and low probabilities of false alarms. Keywords Wind Field Divergence Gust Front Simulation Testing Probability of Detection False Alarm Ratio Total Skill Score.

Subject Categories:

  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE