Unformatted text preview: ospheric pressure in millibars. Two
Two types of barometric pressure measurements:
Station pressure is the actual
pressure at the recording
location. It is affected by the
local altitude. Sea level pressure is
referenced to sea
level, so it has the
anywhere in the
world. Station pressure on a mountain top
will be lower than station pressure
in a valley. Scientists need a fixed
point of reference in order to
compare barometer readings in
different locations. That is why
barometer readings are sometimes
adjusted for elevation above sea
level at the station location. Most
barometers have a
needle which can be
set to remember the
previous reading. Changing
A rising barometer = increasing air pressure.
This usually means: Rising barometer readings indicate that a
high pressure system is approaching.
Higher atmospheric pressure is usually
associated with fair weather and clearing
A falling barometer = decreasing air pressure.
This usually means:
Falling barometer readings usually
indicate the approach of...
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- Spring '10