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Weather
Weather Movement!
Weather vs. Climate
 Climate is the average weather usually taken over a
30-year time period for a particular region and time
period.
 Climate is not the same as weather, but rather, it is
the average pattern of weather for a particular
region.
 Weather describes the short-term state of the
atmosphere.
Weather vs. Climate
 The weather is just the state of the atmosphere at any
time, including things such as temperature,
precipitation, air pressure and cloud cover.
 Daily changes in the weather are due to winds and
storms.
 Seasonal changes are due to the Earth revolving
around the sun.
Weather vs. Climate
 Weather is the condition of the troposphere at a
paricular time and place.
 Weather changes from day to day.
 Weather can be hot or cold, wet or dry,
Calm or stormy, and sunny or cloudy.
Weather vs. Climate
 Climate is the average weather of a place.
 Average temperature and average precipitation
are important in determining climate.
 Northern Tennessee tends to have more
snowfall in the winter, due to its lower
temperatures and mountain landscape.
 Latitude has the strongest effect on climate.
Northern U.S. has a colder climate than the
South.
Weather Movement
 In which direction does weather move?
Jet Stream
 An area of strong winds that are concentrated in a
relatively narrow band in the upper troposphere of
the Northern and Southern Hemispheres.
 Flowing in a semi-continuous band around the globe
from west to east, it is caused by the changes in air
temperature where the cold polar air moving towards
the equator meets the warmer equatorial air moving
towards the poles.
Fronts
The boundary between two air masses is called a front. As a result,
moving fronts indicate a change in the weather. On a weather map
fronts are drawn where there is large change in temperature and a
shift in wind direction.
Cold Fronts
 A cold front means a cold air mass is pushing into a
warmer air mass, and is shown with blue sharp
"teeth" pointing the direction of the moving cold air.
Warm Fronts
 A warm front means a warm air mass is pushing into a
colder air mass, and is shown with red rounded
"teeth" pointing the direction of the moving warm
air.
Cold front vs. Warm front
 What is the difference between the cold front and the
warm front?
Cold Front vs. Warm Front
 Cold Front:
 The passage of a cold front, the temperature and
humidity decrease, the pressure rises, and the wind
shifts (usually from the southwest to the northwest in
the Northern Hemisphere).
 Precipitation is generally at and/or behind the front ,
and with a fast-moving system.
Cold Front vs. Warm Front
 Warm Front: The passage of a warm front, the
temperature and humidity increase, the pressure
rises, and the wind shifts (usually from the southwest
to the northwest in the Northern Hemisphere)
 Precipitation , in the form of rain , snow , or drizzle , is
generally found ahead of the surface front , as well as
convective showers and thunderstorms .
 Fog is common in the cold air ahead of the front.
Although clearing usually occurs after passage, some
conditions may produced fog in the warm air.