Wind

Wind Speed in meters per second

The Weatherlink samples the wind speed reading the same number of times per interval as temperature and averages the readings together to arrive at the average wind speed for the interval.

Archive Interval Sample Rate

• 1 minute every 5 seconds
• 5 minutes every 5 seconds
• 10 minutes every 5 seconds
• 15 minutes every 8 seconds
• 30 minutes every 15 seconds
• 1 hour every 30 seconds
• 2 hours every 60 seconds

High Wind Speed in meters per second

The Weatherlink is constantly checking for a new high wind speed. The highest wind speed value it recorded during the interval gets written into archive memory.

Archive Interval Sample Rate

• 1 minute every 5 seconds
• 5 minutes every 5 seconds
• 10 minutes every 5 seconds
• 15 minutes every 8 seconds
• 30 minutes every 15 seconds
• 1 hour every 30 seconds
• 2 hours every 60 seconds

Wind Direction reported as code value

The Weatherlink samples the wind direction reading the same number of times per interval as temperature. If wind speed is greater than 0 when the Weatherlink samples wind direction, it places a "marker" into one of sixteen "bins" which correspond to the sixteen compass points. At the time of the archive, the Weatherlink determines which bin contains the most markers and writes the corresponding wind direction to the archive memory as the dominant wind direction.

Data is stored as an encoded direction. 0 = N, 1 = NNE, 2 = NE, ...,14 = NW, 15 = NNW.

*Note: During intervals with very low wind speed, it is possible for no wind direction to be recorded, because wind speed was always 0 when direction was sampled. In this case, wind direction for the interval appears as a NULL value or empty field.

Wind Chill reported in degrees Celsius

Wind chill is not stored in archive memory, rather it is calculated as the data gets written to the database file. The software calculates wind chill based on the temperature and wind speed readings for the archive period (that is, the average temperature and the average wind speed during the interval).

These descriptions were taken from the "ReadMe" file included with the Davis Instruments, Weather Link software package. The descriptions have been modified to suit the specifics of our implementation.

Error Correction

When error correction is selected the search is against data that was checked by removing entries less than 0. This error correction was done to try and remove any instrumental anomalies from the data. Our error correction is automated and it should not be assumed that any data that was thrown out has been checked by human eyes. If you want the raw information returned from your search, turn off the error correction in the search options.