WEATHER INFORMATION - ABOUT
FRONTS
Read about weather fronts and more, to help you
understand what's going on outside around you just a little bit
more...
A warm front
is warm air moving into an area of cold air this forces
the warm air to rise over the cold air. As the warm
air lifts into an area of low pressure clouds form as
flat sheets
Cold
Front
A Cold front
is cold air moving into an area of warm air. The cold
air pushes under the warm air forcing the warm air to
rise. The warm air then condenses producing rain.
Occluded
Front
An occluded
front is were two fronts, a warm and a cold
meet. If the cold front cuts under the warm
front it is known as a cold occlusion.
If the cold front rises over the warm one it
is known as a warm occlusion. Both types of
occluded fronts can bring rain.
Global
Air masses
Globally
there are very large areas of high and low pressures.
The form bands around the Earth that are parrellel with
the line of latitude. At the equator (0 ) there is a low
pressure band with two more, one near the Artic (60
North) and one near the antartic (60 South). Between the
low pressure lie high pressure belts one at 30 North and
one at 30 South, just north and south of the tropical
latitudes.
As air moves
from high to low pressures it produces the global
prevailing winds, known as trade winds. The trade winds
are strongest between the high and low pressures with
wind speeds relatively low at the pressure belts. The
trade winds do not blow in a straght line towards the
poles as they are blown of course by the spinnig of the
Earth. In the northern hemisphere the winds are blown to
the right and to the left in the southern hemisphere.
Therefore making prevailng winds mainly south westerly
in the North.
Atmospheric
circulation
The Hadley cell carries heat and
moisture from the tropics to
the northern and southern mid-latitudes.
The low pressure area at the equator is the
driving force for the whole current system
of the Earth. As warm air rises at this low
pressure area it cools and condenses forming
clouds and precipitation. The low pressure
then takes cold air from the north and south
to replace the rising air. This cold air is
then itself heated pushing the now dry warm
air further north and south. This dry air
starts to sink back to Earth at the tropics
creating the High Pressure areas. This
falling dry air makes the areas have a much
drier climate forming deserts and savannahs.
This dry air is then sucked back towards the
equator where the process is repeated. The
areas where this cycles of winds happen is
known as the Hadley Cells.
Beijing
Anomaly
Scientists scanning the deep interior of Earth have
found evidence of a vast water reservoir beneath
eastern Asia that is at least the volume of the
Arctic Ocean.
The left
figure is a slice through the Earth, taken from the
figure on the right, showing the attenuation
anomalies within the mantle at a depth of roughly
620 miles. In both images, red shows unusually soft
and weak rock believed to be saturated with water,
and the blue shows unusually stiff rock (yellow and
white show near-average values).
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