Download CHAPTER 15 WEATHER - Clearview Regional High School District

CHAPTER 16
WEATHER
Weather- Present state of atmosphere
16.1 Factors
- Temp, air pressure, wind
- Water cycle- basis of weather
Wind
- Created from uneven heating
- Wind speed measured by anemometer
Humidity
- Amount of water vapor in air
*Warm air holds more than cold
Relative Humidity
- Water vapor in air vs. how much air
can hold at a certain temp.
Dew point
- Temp at which condensation takes
place
Cloud Formation
1. Warm air rises & expands
2. Water vapor condenses around dust
3. Droplets of water form clouds
Cloud Classification
- Shape & height
Shape
.
1.
2.
3.
4.
Stratus- Flat, gray, precipitation
Cumulus- White, puffy, tall
Cirrus- Feathery/fair weather
Nimbus- Rain cloud
Stratus
Fog (Stratus)
Cumulus
Cumulonimbus
Cirrus
Nimbus
Height
1. Cirro = High (18,000 + feet)
2. Alto = Middle (6,500 -18,000 feet)
3. Strato = Low (Up to 6,500 feet)
16.2 Weather Patterns
Fronts
http://ww2010.atmos.uiuc.edu/(Gh)/guides/crclm/act/fpr.rxml
- Boundary between 2 different air masses
- Storms occur here
Fronts
1. Cold- Cold air pushes warm air up
2. Warm- Warm air slides over cold
3. Occluded- Warm air between cool
and cold air
4. Stationary- Fronts stop moving
Cold Front
Warm Front
Occluded Front
Stationary Front
Severe Weather
Thunderstorms
- Warm, moist air rises rapidly & cools
- Strong winds, thunder, lightning
Tornadoes
- Form along fronts
- Warm air rises up creates funnel
Hurricanes
- Forms over tropical oceans
- Heat energy from ocean turns to wind
16.3 Forecasting Weather
Weather Info
1. Station model
http://weather.cod.edu/notes/stnmodel.html
2. Isobar- Wind
3. Isotherm- Temperature