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Davis VANTAGE VUE Manual

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Barometric Pressure
Barometric Pressure
The weight of the air that makes up our atmosphere exerts a pressure on the surface of the
earth known as atmospheric pressure. Generally, the more air above an area, the higher the
atmospheric pressure. This means that atmospheric pressure changes with altitude. For
example, atmospheric pressure is greater at sea level than on a mountaintop. To compensate
for this difference and facilitate comparison between locations with different altitudes,
atmospheric pressure is adjusted to the equivalent sea level pressure. This adjusted pressure is
known as barometric pressure. In reality, the Vantage Vue measures atmospheric pressure.
When you enter your location’s altitude in Setup Mode, the Vantage Vue stores the necessary
offset value to consistently translate atmospheric pressure into barometric pressure.
Barometric pressure also changes with local weather conditions, making barometric pressure
an extremely important and useful weather forecasting tool. High pressure zones are generally
associated with fair weather while low pressure zones are generally associated with stormy
weather. For forecasting purposes, however, the value of the absolute barometric pressure is
generally less important than the change in barometric pressure. In general, rising pressure
indicates improving weather conditions while falling pressure indicates deteriorating weather
conditions.
Evapotranspiration (ET)
Evapotranspiration (ET) is a measurement of the amount of water vapor returned to the air in a
given area. It combines the amount of water vapor returned through evaporation (from wet
surfaces) with the amount of water vapor returned through transpiration (exhaling of moisture
through plant stomata) to arrive at a total. Effectively, ET is the opposite of rainfall, and it is
expressed in the same units of measure (inches, millimeters).
The Vantage Vue uses air temperature, relative humidity, barometric pressure, average wind
speed, and solar radiation data to estimate ET, which is calculated once an hour on the hour.
Measuring ET requires that the Vantage Vue console listen to a an optional Vantage Pro2 Plus
station with a solar radiation sensor installed.
Solar Radiation
What we call “current solar radiation” is technically known as Global Solar Radiation, a
measure of the intensity of the sun’s radiation reaching a horizontal surface. This irradiance
includes both the direct component from the sun and the reflected component from the rest of
the sky. The solar radiation reading gives a measure of the amount of solar radiation hitting the
solar radiation sensor at any given time, expressed in Watts/sq. meter (W/m
2
). Measuring solar
radiation requires that the Vantage Vue console listen to an optional Vantage Pro2 Plus station
with a solar radiation sensor installed. Solar Radiation is displayed in the Weather Center
when ET is pressed and WxCEN is pressed multiple times.
UV (Ultra Violet) Radiation
Energy from the sun reaches the earth as visible, infrared, and ultraviolet (UV) rays. Exposure
to UV rays can cause numerous health problems, such as sunburn, skin cancer, skin aging, cat-
aracts, and immune system suppression. Measuring UV radiation requires that the Vantage
Vue console listen to an optional Vantage Pro2 Plus station with a UV radiation sensor
installed. The UV Index is displayed in the Weather Center when ET is pressed and WxCEN is
pressed multiple times.
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