Project Info
Elevation profile image which shows the Sodar site location at a similar elevation to Cobb Mountain. Project Objective

The objectives of the upper-air pilot study are to determine if upper-air wind data can be used by utilities to improve short-term (up to 15 hours) and very-short-term (from 0 to 3 hours) extreme wind forecasts, and enhance situational awareness during high-wind events. The project also aims to integrate the collected data into next-generation fire models and data management systems currently used by utilities for routine operations. To meet these objectives, Sonoma Technology Inc. will leverage and augment existing meteorological networks with upper-air wind measurements, and provide data for use in meteorological models and other data management systems currently used by utilities.

Upper Air Instrumentation

An Atmospheric Systems Corporation (ASC) Model 2000 Sodar works by sending out a sound pulse and recording the sound as it is scattered off atmospheric turbulence back to the Sodar. After the sound pulse is transmitted, the Sodar records scattered sound to determine wind speed, direction, inflow angle, and height. The resulting data provide information about the atmospheric wind profile. The picture below shows the Sodar instrumentation.

Sodar Instrument Picture
Interpretation of the Data

The data collected by the Sodar 2000 show wind speed and direction by time and vertical height. The plot below shows an example of data collected by the Sodar 2000. The hourly wind data will have a vertical resolution of approximately 20 m from about 80 to 600 m agl.

Sodar data plot showing strong wind variations.