Transcript Weather - My CCSD

Definitions
1. Weather – the condition of the earth’s atmosphere
2. Relative humidity – a measure of the amount of water
vapor in the air compared with the amount of water
vapor the air can hold.
3. Dew point – the point when water vapor in the air cools
down and condenses
4. Barometric pressure – amount of pressure caused by
the atmosphere
5. Doppler radar - detects wind velocity and
precipitation
Definitions cont…
6. Precipitation – rain, snow, sleet, hail, and
freezing rain
7. Clouds – water vapor that condenses up in the
air
8. Isobar – lines that are drawn to connect areas
that have equal barometric pressure
9. Conduction – the transfer of heat between
objects
10. Radiation – transfer of energy in electromagnetic
waves
Definitions cont…
11. Convection – transfer of heat in a fluid from a
warmer area to a cooler area
12. Evaporation – liquid changes into gas
13. Coriolis effect – the deflection of wind
14. Gust – sudden increase in wind velocity
15. Storm surge – an unusually high rise in the level
of the ocean that brings a wall of water to the
shoreline
Types of Weather Fronts
Cold Front = an area of colder temperatures
moving into an area
Warm Front = an area of warmer temperatures
moving into an area
Stationary Front = When a warm or cold front
stops moving.
Occluded front = When a cold front takes over a
warm front
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 Knowing the temperature is required to make
predictions.
 Always measure the current temp. about 6 feet off of
the ground and in the shade.
 The amount of moisture in the air is called humidity.
 Different cloud types can help you predict changes in
weather patterns.
 Relative humidity measures temp and humidity
High-Level Clouds
Cirrus Clouds
Mid-Level Clouds
Altus Clouds
Low-Level Clouds
Stratos Clouds
Various Clouds
Cumulus Clouds
Isolated clouds in the form of delicate, white
threads.
These clouds have a fibrous appearance,
silky sheen, or both.
Clouds are found high in the sky (high-level)
 Altos clouds are caused by a convection.
They are a warning of an approaching cold front.
On a humid summer morning, they indicate a
thunderstorm will occur later in the day.
Stratus clouds are dark, low-level clouds
accompanied by light precipitation.
 When temperatures are cold enough, these clouds
may contain ice particles and snow.
 Cumulus clouds are small clouds that look like
lumps of cotton.
Cumulus clouds form as water vapor condenses in
strong, upward air currents above the earth's surface.
These clouds usually have flat bases and lumpy tops.
1.Tornado, funnel cloud
2.Thunderstorm in area (no rain at station)
3.Thunderstorm with rain
4.Snow thunderstorm
5.Thunderstorm with freezing rain
6.Thunderstorm with hail or ice
7.Severe thunderstorm in area (no rain at station)
8.Severe thunderstorm with rain
9.Severe snow thunderstorm
10.Severe thunderstorm with freezing rain
11. Severe thunderstorm with hail or ice
12. Moderate freezing rain
13. Light freezing rain
14. Rain shower
15. Light rain shower
16. Light rain
17. Moderate rain
18. Heavy rain
19. Light snow shower
20. Snow shower
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22.
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30.
Light snow
Moderate snow
Heavy snow
Rain mixed with hail or ice pellets
Hail or ice pellets
Moderate freezing drizzle
Light freezing drizzle
Light drizzle, mist
Moderate drizzle
Heavy drizzle
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32.
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39.
Light Hail
Hail or ice pellet shower
Ice crystals
Fog
Blowing snow, blizzard
Blowing sand
Rain-snow mixture
Lightning
Smoke, smog
Station Symbols
• The weather symbol
highlighted in yellow
indicates the type of
weather occurring at the
time the observation is
taken. In this case, fog
was reported. If there were
thunderstorms occurring
when the observation was
taken, then the symbol for
thunderstorms would have
appeared instead.
Station Symbols
• Temperature: The
value highlighted in
yellow located in the
upper left corner is the
temperature in degrees
Fahrenheit. In this
example, the reported
temperature is 64
degrees.
Dew Point Temperature:
• The value highlighted
in yellow located in
the lower left corner is
the dew point
temperature in degrees
Fahrenheit. In this
example, the reported
dew point temperature
is 58 degrees.
Cloud Cover:
• The symbol
highlighted in yellow
indicates the amount
of cloud cover
observed at the time
the observation is
taken. In this case,
broken clouds were
reported.
Sea Level Pressure:
• The value highlighted
in yellow located in
the upper right corner
represents the last
three digits of the sea
level pressure reading
in millibars (mb).
Wind Barb:
• The symbol
highlighted in yellow
is known as a wind
barb. The wind barb
indicates wind
direction and wind
speed.
FRONTS AND PRESSURE
CLOUD TYPES
CLOUD COVER
WIND DIRECTION & SPEED
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