Transcript Description+of+a+Warm+Front

Description of a Warm Front
Description of a Warm Front
A warm front is created by a
(1)warm air mass moving
(2)into a cooler area.
Since the warm air is (3)less
dense than the cold air, it
rises up over the (4)cold air
rather than pushing it aside as
a (5)cold front does.
As the air rises, it (6)cools and
water condenses out of it.
Description of a Warm Front
Examine the diagram above, from
right to left.
This will give you an indication of
what an approaching warm
(7)front looks like.
A day or two before the arrival of
a warm (8)front, the
previously clear skies get a few
wispy (9)cirrus clouds.
These clouds thicken, covering
more of the (10)sky.
Description of a Warm Front
They move lower until a layer of
(11)altostratus clouds covers
the sky like a featureless grey
blanket.
Eventually the clouds are so thick
that (12)rain or (13)snow
begins.
As the cloud base gets lower, the
clouds become
(14)nimbostratus clouds.
Description of a Warm Front
If it is very cold, (15)freezing rain or (16)sleet might
develop.
At about the time that the precipitation stops, the
temperature (17)rises.
Description of a Warm Front