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RAWS-P Remote Automated Weather Station
3. Station Siting and Orientation
3.1 General Description
Selecting an appropriate site for the RAWS is critical in order to obtain
accurate meteorological data. In general, the site should be representative of
the general area of interest and away from the influence of obstructions such as
buildings and trees.
See Section 9 for siting references.
NOTE
If any part of the weather station comes in contact with
power lines, you could be killed. Contact local utilities
for the location of buried utility lines before digging or
driving ground rods.
WARNING
3.2 Air Temperature and Relative Humidity
A temperature and relative humidity sensor should be located over an open
level area at least 9 m in diameter (EPA). The surface should be covered by
short grass, or where grass does not grow, the natural earth surface. The sensor
must be housed inside a radiation shield and adequately ventilated.
Situations to avoid include: 1) large industrial heat sources, 2) rooftops, 3)
steep slopes, 4) sheltered hollow, 5) high vegetation, 6) shaded areas,
7) swamps, 8) areas where snow drifts occur, and 9) low places holding
standing water after rains.
3.3 Precipitation
A rain gauge should be located over an open level area covered by short grass,
or where grass does not grow, the natural earth surface. Level the rain gage.
Take off the funnel and remove the rubber band securing the
tipping bucket mechanism during transport.
NOTE
3.4 Solar Radiation
A solar radiation sensor should be located to avoid shadows on the sensor at
any time. Orient the solar radiation sensor where the solar radiation sensor
faces south (northern hemisphere) minimizing the chance of shading from
other weather station structures. Reflective surfaces and sources of artificial
radiation should be avoided. Level the solar radiation sensor.
3.5 Wind Speed and Direction
A wind sensor should be located over open level terrain and at a distance of at
least ten times (EPA) the height of any nearby building, tree, or other
obstruction.
5
Summary of Contents for RAWS-P
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