Past Weather Garden Nursery Landscaping Guide
Past Weather Patterns And A Barometer
By Joel F Morningstar
A barometer is a device that measures atmospheric pressure. It
is one of the most widely used tools for predicting the weather.
Simply by observing past weather, such as atmospheric pressure,
rainfall data, cloud types and wind speeds, meteorologists have
discovered that the barometer is an accurate way to predict future
weather patterns. Here are a few guidelines to help you review
and understand how a barometer works.
Low And High Pressure Zones
Air rising away from the earth’s surface faster than it can be
substituted by air streaming in from surrounding areas creates
a low pressure zone. This decreases the weight of the air over
the barometer reservoir; thus the mercury level moves to a lower
level.
Conversely, in high pressure zones, air is moving towards the
earth’s surface faster than it can stream out to surrounding zones.
This produces more air over the reservoir; thus the air’s weight
surges higher and the mercury level moves higher to create equilibrium.
Windy And Rain Conditions
A decline in atmospheric pressure is a sign of windy and generally
rainy conditions, while an increase in atmospheric pressure means
cooler and drier conditions. A gradual drop in atmospheric pressure
means that a low pressure area is briefly happening in a neighboring
area; but it is unlikely that you will see any noticeable variations
in the weather where you are located.
Minor, quick falls in air pressure indicate a nearby variation
in weather and short periods of wind and shower conditions typically
come after them. A sudden fall in air pressure in a short period
of time often indicates that a storm is expected to occur within
five to six hours and will only be short-lived.
Meteorologists know this because they have studied past weather,
including wind speeds, rainfall maps and rainfall records.
Understanding Barometric Pressure
An example of barometric pressure is when a rubber suction cup
is pressed against a smooth surface, as it will remain stuck.
By simply pressing the cup down flat against the wall surface,
the air is expelled from the area under the cup and a vacuum is
then formed.
The pressure of the air which originally acted in that area now
no longer thrusts against the inside of the cup. When it is released,
it will stay in the compressed position because the air pressure
is acting on the outside only and therefore presses the edge of
the cup down so firmly that no air can penetrate into the area
which remains void of air.
Explaining Weather Patterns With A Barometer
Differences in air pressure are also utilized when we drink liquid
through a straw. Air is sucked out of the straw and the barometric
air pressure will force the liquid up through the straw.
The barometric pressure acts upon the surface of the liquid in
the glass. Through past weather experiments, scientists understand
how vital the barometer really is in predicting future weather.
About the Author:
Joel F Morningstar has written a number of articles on gardening, backyard ideas, home improvement and landscaping including
Patio Garden,
Lawn And Garden,
Miniature Fruit Trees,
Pepper Plant,
Front Yard Landscape,
Lawn Swing,
Fast Growing Trees,
Stone Walkway,
Big Backyard,
Deck Ideas,
Swing Set Backyard,
Backyard Landscaping.
Keep a lookout for more of his articles on this website.
Little Known Facts About Rain Gauge....
Can I make my own rain gauge?
There is no reason why you cannot make your
own rain gauge. And it is a great project for a classroom or for
your kids. The first thing you need to do is find something that
will catch the rainfall and funnel it into a cylinder.
A graduated cylinder is best because it
makes reading the results far easier than if you had it funneled
down to a glass jar. The graduated cylinder will also come marked
in units of millimeters for a more accurate result.
After you have attached a funnel to the
cylinder you will need to then attach it to a pole in a clear,
open area. You do not want any trees or buildings to be near.
This will mean you get a more accurate reading.
Once everything is attached and in place
all you need now is to sit back and wait for it to rain.
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