Transcript Description of a Warm Front

Description of a Warm Front
Description of a Warm Front
A warm front is created by a
warm air mass moving into a
cooler area.
Since the warm air is less dense
than the cold air, it rises up
over the cold air rather than
pushing it aside as a cold
front does.
As the air rises, it cools and
water condenses out of it.
Description of a Warm Front
Examine the diagram on your
sheet.
This will give you an indication of
what an approaching warm
front looks like.
A day or two before the arrival of
a warm front, the previously
clear skies get a few wispy
cirrus clouds.
These clouds thicken, covering
more of the sky.
Description of a Warm Front
They move lower until a layer of
altostratus clouds covers the sky
like a featureless grey blanket.
Eventually the clouds are so thick
that rain or snow begins.
As the cloud base gets lower, the
clouds become nimbostratus
clouds.
Description of a Warm Front
If it is very cold, freezing rain or sleet might
develop.
At about the time that the precipitation stops, the
temperature rises.
Description of a Warm Front