air mass, air pressure, high pressure, low pressure, occluded front, stationary front, warm front, cold front, hurricane, tornado, thunderstorm

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Weather Vocabulary

• air mass, air pressure, high pressure, low
  pressure, occluded front, stationary front, warm
  front, cold front, hurricane, tornado,
  thunderstorm

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weather

• changes each time a new air mass moves over an
  area.
• describes the condition of the atmosphere at a
  specific time.
• is always changing because of movement of air
  and moisture in the atmosphere.

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air mass-

• a large body of air that has the same properties
  throughout
• can be warm, cool, wet, or dry depending the type
  of land or sea it passes over
• sixth different types of air masses that affect
  our country

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air pressure-
the downward pressure exerted by the weight of
the overlying atmosphere.
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high pressure

• an area where the air is slowly sinking
• clouds dont usually form when air is sinking
• usually means good clear weather
• usually pushed out toward areas of low pressure

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low pressure

• an area where the air is slowly rising
• clouds often form in areas of low pressure
• air masses move toward areas of low pressure
• usually cloudy or rainy

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front

• area in which two types of air masses meet
• includes both cold and warm air masses
• high pressure system moves into a low-pressure
  system at a front
• four types of fronts

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occluded front
A cold front overtakes a warm front. Changes with
temperature, dew point temperature, wind
direction, and wind shift often occur with an
occluded front. It generally brings low
temperatures, and light rains.
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stationary front

• warm air meets cool air and the masses do not
  have enough force to lift the
• warm air over the cold
• brings light winds and wet weather, sometimes
  lasting for several days

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warm front
The transition zone where a warm air mass
overtakes and replaces a colder air mass.
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cold front
The transition zone where a colder air mass
overtakes and replaces a warmer air mass.
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hurricane
Tropical cyclone, formed in the atmosphere over
warm ocean areas, in which wind speeds reach 74
miles per hour or more and blow in a large spiral
around a relatively calm center or "eye."
Circulation is counter-clockwise in the Northern
Hemisphere and clockwise in the Southern
Hemisphere.
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tornado
a violent, rotating column of air which is in
contact with both the surface of the earth and a
cumulonimbus cloud or, in rare cases, the base of
a cumulus cloud. Tornadoes come in many sizes but
are typically in the form of a visible
condensation funnel, whose narrow end touches the
earth and is often encircled by a cloud of
debris.
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thunderstorm
a storm resulting from strong rising air
currents heavy rain or hail along with thunder
and lightning
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Recording Daily Weather
Day 1 8/24 Day 2 8/25 Day 3 8/26 Day 4 8/27 Day 5 8/28
Temperature 79.5 F 79.5 F 79.3 F 79.3 F 79.2 F
Precipitation 0.0 inches 3.32 inches 0.74 inches 0.04 inches 0.0 inches
Air pressure 29.93 in 29.93 in 29.93 in 29.93 in 29.96 in
Cloud Cover None Cloudy Cloudy Cloudy Cloudy
Wind Direction SW WSW WSW SW WSW
Wind Speed 0.0 mph 0.0 mph 0.0 mph 0.0 mph 0.0 mph
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Recording Daily Weather
Mean Median Mode
Temperature
Precipitation
Air pressure
Cloud Cover
Wind Direction
Wind Speed
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Mean- the average of a set of figures. Median-
the middle value in a set of statistical
values. Mode- a value that has the highest
frequency within a set of values.
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Coordinates for Tropical Storm Hanna
29-Aug 21.8 -63.8
30-Aug 22.1 -65.3
31-Aug 22.9 -67.8
1-Sep 23.7 -72.2
2-Sep 21.8 -72.5
3-Sep 20.5 -72.4
4-Sep 23.2 -72.1
5-Sep 26.5 -76.3
6-Sep 32.4 -79.1
7-Sep 40.5 -73.4
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29-Aug 21.8 -63.8
30-Aug 22.1 -65.3
31-Aug 22.9 -67.8
1-Sep 23.7 -72.2
2-Sep 21.8 -72.5
3-Sep 20.5 -72.4
4-Sep 23.2 -72.1
5-Sep 26.5 -76.3
6-Sep 32.4 -79.1
7-Sep 40.5 -73.4
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1-Sep 18 -41
2-Sep 18 -42
3-Sep 22 -53
4-Sep 22 -53
5-Sep 23 -64
6-Sep 23 -66
7-Sep 21 -75