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Atmospheric Pressure
The display console features a "PRESSURE" weather page.
P R E S S U R E
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Atmospheric Pressure is defined as the pressure at any location on
the Earth, caused by the weight of the column of air above it. At sea
level, atmospheric pressure has an average value of one atmosphere
and gradually decreases as altitude increases. Also called
barometric pressure.
The weight of the air mass, or atmosphere, that envelopes Earth
exerts pressure on all points of the planet's surface. Meteorologists
use barometers to measure this atmospheric pressure (also called
barometric pressure). At sea level the atmospheric pressure is
approximately 1 kilogram per square centimeter (14.7 pounds per
square inch), which will cause a column of mercury in a mercury
barometer to rise 760 millimeters (30.4 inches). Subtle variations in
atmospheric pressure greatly affect the weather. Low pressure
generally brings rain. In areas of low air pressure, the air is less
dense and relatively warm, which causes it to rise. The expanding
and rising air naturally cools, and the water vapor in the air
condenses, forming clouds and the drops that fall as rain. In high
pressure areas, conversely, the air is dense and relatively cool, which
causes it to sink. The water vapor in the sinking air does not
condense, leaving the skies sunny and clear.
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USE
Rainfall
The RAINFALL weather page will display the rainfall total from the
current rain event. A weather system may come into your area very
slowly, and may rain over many hours or days without many breaks.
The rainfall weather page displayed event total accounts for this and
will continue to display the total until the rain event is over.
TO ACCESS TODAY, WEEK, MONTH, YEAR RAINFALL TOTALS:
While viewing the rainfall weather page, pressing the " " button
repeatedly will display the recorded RAINFALL TOTALS for TODAY,
WEEK, MONTH, and YEAR. Note that the time and date will change
to display exactly when the record was observed.
To clear out an erroneous record, press and HOLD the " " button
while you are viewing the actual record you want to clear.
Wind Speed
CURRENT WIND SPEED:
The CURRENT wind speed will display the currently recorded
wind speed and is updated every 18 seconds.
WIND SPEED PEAK:
The WIND SPEED PEAK will display the highest wind speed
recorded in the previous 60 minutes.
TO ACCESS TODAY, WEEK, MONTH, YEAR HIGHEST WIND RECORDS:
While viewing the wind speed weather page, pressing the " "
button repeatedly will display the recorded highest WIND SPEED for
TODAY, WEEK, MONTH, and YEAR. Note that the time and date
will change to display exactly when the record was observed.
To clear out an erroneous record, press and HOLD the " " button
while you are viewing the actual record you want to clear.
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