The ultrasonic wind sensor used in the Tempest device is a different style of equipment and measurement technique compared to a mechanical cup and vane anemometer. Instrumentation can differ between weather observing equipment. If possible, try moving your Tempest device around and analyze the data - you might be surprised at the varying microclimates around you and how careful siting makes for accurate data. Temperature and humidity sensors can be affected by m oisture in wood decks, dryer vents, radiation from nearby surfaces. Anemometers can be obstructed from certain directions and subject to turbulent flow around any obstacle in the wind. Some personal, home weather stations may be poorly sited or just experiencing the environment as it is around them. Siting differences can result in different readings too. These microclimates can be created from ground vegetation and trees, bodies of water, urban areas or terrain influences, etc. For example, most airport weather stations read higher temperatures and lower humidity as they are sited over a tarmac surface where the material of the ground is better at radiating into the air above it. Microclimates are localized atmospheric conditions that differ from those in the surrounding area. Instrumentation also varies between weather stations different sensor manufacturers and styles of instruments have different accuracy specifications and limitations. Weather stations can be sited differently and some areas subject to microclimate conditions. ![]() Observations from nearby weather stations and other data sources may not match exactly. ![]() There is often an explanation for readings that seem only a little off.
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