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Understanding weather....

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Lee Kimmich

on 28 April 2010

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Transcript of Understanding weather....

Understanding weather... What produces weather?? How does water get into the atmosphere?? Weather: The short term state of the atmosphere, including temperature, humidity, precipitation, wind and visibility Weather is caused by the movement of water
through the atmosphere. This is called the
WATER CYCLE... The Water Cycle: A quick review...
Step #1: Evaporation: The change in state
from liquid to gas.
Step #2: Condensation: The change in state
from Gas to liquid.
Step #3: Precipitation: Water falling from the sky. The air is like a sponge... as water evaporates, it begins to soak up the water vapor... The measurement of water in the Air is called humidity. Relative humidity Certain temperatures of air can hold certain amounts of moisture. This is called relative humidity. Relative humidity is measured in percentages (100%, 78% etc) The higher the relative humidity, the more "saturated" the air becomes. For humans this can
be VERY uncomfortable!! WHY? It is uncomfortable because to cool down
we rely on the sweat to evaporate off of
our skin. The more saturated the air becomes, the less sweat evaporates off the skin causing us to "feel" VERY warm and uncomfortable. What is the dew point? The dew point is the
temperature at which
gas condenses into a liquid. The dew point is
reached when air cools and
easily becomes saturated.
A sign of the dew point would be
DEW on the grass in the morning
OR FROST in the fall.... CLOUDS!! Cloud: A collection of small water droplets
or ice crystals suspended in the air, which forms when the air is cooled and condensation occurrs. Types of clouds:

CUMULUS CLOUDS Puffy, white clouds that tend to have flat bottoms.
These clouds generally indicate fair weather.
When they get LARGE they produce thunderstorms. What are they? LARGE cumulus clouds would be called
Clouds that have names like nimbus or nimbo
are likely to produce precipitation. STRATUS CLOUDS Form in layers
Cover large areas of the sky.
Nimbostratus clouds Produce light to heavy continuous rain. FOG is a stratus cloud that has formed near the ground.
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