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Weather Bureau Speeds

September 21st Fact-of-the-Day

The U.S. Weather Bureau discovered in about 1898 that their anemometers were indicating wind speeds about 25% higher than true speeds. Despite learning that, until 1924 they continued recording speeds about 25% higher than true speeds to avoid inconsistency with more than a quarter century of previously recorded data. As a result, U.S. Weather Bureau wind speed data recorded prior to 1924 can mislead tower engineers trying to determine long-term maximum recorded speeds at an antenna installation site. ©2004 Martek International All rights reserved.


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