weather - mr. lemke earth science and marine studies · weather is caused by differential heating...
TRANSCRIPT
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Weather
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What is Weather???
The state of the variables of the atmosphere at any given location for a short period of time. What causes weather?
Weather is caused by differential heating of the Earth
- The equator receives more insolation than the poles - Convection Cells Transfer heat within the atmosphere.
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The layers of the Atmosphere (pg 14 in reference table)
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Complete page 3 and 4 in packet
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Weather Variables
- the measure of the average kinetic energy
- how fast the molecules move
The instrument used to measure temperature:________________ Thermometer
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F Fahrenheit Celsius Kelvin
C K
isotherms connect places of equal temperature.
Lines that
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Isotherms : Lines of Equal Temperature
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ESRT page 13
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13
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Use ESRT page 13
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Weather Variables
Air Pressure:
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- the weight of Earth’s atmosphere - changes depending on the temperature
barometer
inches milibars
Isobars Lines that
connect places of equal barometric pressure
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Watch out for falling barometers
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As temp inc. air expands and its density and pressure dec.
1) Temperature:
Factors Affecting Air Pressure?
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As temp inc. air expands and its density and pressure dec.
1) Temperature:
2) Water Vapor (Humidity):
As humidity increases air pressure decreases
Factors Affecting Air Pressure?
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As temp inc. air expands and its density and pressure dec.
1) Temperature:
2) Water Vapor (Humidity):
As humidity increases air pressure decreases
3) Altitude
As altitude increases air pressure decreases
Factors Affecting Air Pressure?
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Units of Air Pressure:
1)Millibars 2)Inches of Mercury
PG 13 in Reference table
Convert Millibars to Inches using the Reference Table
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Pressure and Wind
Winds are caused by differences in air pressure.
From the direction they come from
Anemometer Barometer
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Wind Direction
Wind is named from the direction it comes from.
Name the wind
N
S
South Wind
SE
NW North West Wind
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The closer together the isobars the faster the wind speed.
Between A and B
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Review
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High Pressure Low Pressure
High Pressure H L
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Draw the relationship between air pressure and altitude.
Altitude
Air
Pre
ssu
re
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Students complete Drawing Isotherm Lab
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In a high pressure area,
air will (rise, sink)
because the air is
(less, more) dense.
This is because the air is
(cold, warm)
and (rises, sinks).
Therefore, clouds CANNOT form.
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In a low pressure area,
air will (rise, sink)
because the air is
(less, more) dense.
This is because the air is
(cold, warm)
and (rises, sinks).
Therefore, clouds are
LIKELY to form.
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Correctly draw the direction of wind flow around both a high and a low pressure area in the NORTHERN HEMISPHERE.
In and to the Left Out and to the Right (Cyclone) (Counterclockwise)
(Anticyclone) (Clockwise)
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low
pressure
high
pressure
warm or cold air
air rising or sinking
clouds or no clouds
clockwise or
counterclockwise wind
direction
winds toward or
away from the center
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Water heats up slower than land - high specific heat - cooler temperatures - air sinks
Pressure HIGH
H
Land heats up faster than water - low specific heat - warmer temperatures - air rises
Pressure Low
L
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Water cools down slower than land (stays warmer) - high specific heat - warmer temperatures at night - air rises
Pressure Low
L
Land cools down faster than water - low specific heat - cooler temperatures at night - air sinks
Pressure High
H
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On the diagrams below, label which one represents a
land breeze and which represents a sea breeze.
Correctly label on each diagram where the
high and low pressure areas would be found.
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On the diagrams below, label which one represents a
land breeze and which represents a sea breeze.
Correctly label on each diagram where the
high and low pressure areas would be found.
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The deflection of winds and ocean currents caused by the rotation of Earth.
Deflection is to the right in the Northern Hemisphere, and to the left in the Southern Hemisphere
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In the southern
hemisphere the curve is to the left.
In the northern
hemisphere the curve is to the right.
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Weather Factors Associated with Different Pressure Areas
Wind blows Cool / cold air
Air sinks / goes down Air moves outward
Clockwise
H
No clouds No precipitation
Air rises Air moves inward
Warm air Counter Clockwise
L
Clouds Precipitation likely
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Global Wind Currents
Air rises and sinks
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14
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Using the chart on page 14, state the prevailing
wind direction for each latitude below:
45°N
45°S
75°N
20°N
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• Complete page 11 in packet
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Atmospheric Moisture
What is moisture in the atmosphere?
Water Vapor: Gaseous water in the atmosphere
Humidity:
Water Vapor of the atmosphere
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a ratio between the amount of moisture is in the atmosphere and how much moisture the atmosphere can hold.
%
saturated
100 % = Precipitation
the warmer the temperature is the more moisture it can hold
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Indirect Relationship
as temp increases RH decreases
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decreases
Temperature
Re
lati
ve H
um
idit
y
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Hygrometer Sling psychrometer
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Warm Air Cold Air
When the container is
"full" it is saturated
Saturated Air has reached the dew point
- The temperature in which the air is saturated. - 100% relative humidity
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air temperature
temperature an air parcel cooled by evaporation of water (wet cloth)
Determining Relative Humidity and Dew point Temperatures
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12
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Complete page 14 in packet
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Cloud Formation Condensation
Change of phase from water vapor to liquid water
1) Water on cold glass of water
2) Water on a mirror after a shower
3) Fog, Clouds
water vapor must be present
air must be saturated (relative humidity 100%)
condensation nuclei - ex dust particles
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warm air rises because it is less dense
cold air sinks because it is more dense
What is the called?
CONVECTION
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Formation of Clouds 5.Precipitates
4.Condenses
(Clouds forum)
3.Cools
2.Expands
1. Warm Air Rises
read up http://www.wimp.com/giantcloud/
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cloud particles too heavy to remain suspended in the air fall to Earth
include rain, hail, sleet, snow, freezing rain
Cleans the atmosphere
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Students complete cloud in bottle lab
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Weather
Where does the energy for weather originate?
Insolation from the Sun
In the United States, the general direction that weather systems move is toward the EAST
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13 F
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76
55
.. 138
3\
Temperature
Dew point
Wind Direction &
Speed
Barometric Pressure
Current Weather
Cloud Cover
Barometric Trend
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76° F 55° F 100%
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138
Add a decimal between the last two digits
13.8
Add a 9 or 10 in front *Above 500 place a 9 in front
* Below 500 place a 10 in front
1013.8
Rise Fall Steady
Add decimal in front of last number
3 = 0.3 rise then fall over last 3 hrs.
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76° F 55° F 100% 1013.8 0.3 Rise then fall
NE 20 Knots
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Barometric Pressure
738
973.8
Add a decimal between the last two digits
73.8 Add a 9 or 10 in front
*Above 500 place a 9 in front * Below 500 place a 10 in front
PRACTICE
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Barometric Pressure
1013.8 Drop the 9 or 10 and the decimal point
1013.8 = 138
PRACTICE
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Barometric Pressure
973.8 Drop the 9 or 10 and the decimal point
973.8 = 738
PRACTICE
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Complete packet page 17 - 18 Complete Station Model Lab
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Large region of the atmosphere with uniform temperature and humidity
Air masses get their characteristics based on
where they form.
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The abbreviations used to classify air masses use the following letters: c, m, T, P, and A.
For each letter, describe its property:
Word Means
c
m
T
P
A
continental dry
maritime moist
Tropical warm
Polar cold
Arctic very cold
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13
Continental Polar Dry & Cold
Continental Tropical Dry & Warm
Maritime Polar Wet & Cold
Maritime Tropical Wet & Warm
Continental Arctic Dry & Very Cold
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cP
mP cP
mP
mT cT mT
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• Complete page 21 in packets
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Fronts
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- the boundary between two air masses
- Where all precipitation occurs
13
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Reference Table pg 13
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cold air is located behind the front
- usually pass quickly with violent weather
- cold air pushes the warm, moist air upward
- cold air is located behind the front
- brings colder but clear weather conditions
Cold Air Warm Air
Cold Air
Warm Air
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http://www.classzone.com/books/earth_science/terc/content/visualizations/es2002/es2002page01.cfm?chapter_no=20
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usually pass slowly
- warm air is located behind the front
- pass slowly, conditions are usually cloudy and rainy for several hours
- brings warmer but rainy weather conditions
Warm Air
Cold Air
Warm Air
Cold Air
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http://www.classzone.com/books/earth_science/terc/content/visualizations/es2002/es2002page01.cfm?chapter_no=20
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Occluded Front
- Formed when cold front overtakes a warm front, lifting warm air mass off the ground.
- Forms mid-latitude cyclone
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http://www.physicalgeography.net/fundamentals/7s.html
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What direction to fronts (weather) travel across the United States?
Westerly to Easterly
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Complete page 23 in packet. Complete weather map lab activity.
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Severe Weather
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Mid-Latitude Cyclone
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Mid-Latitude Cyclone
-Low Pressure System (Counterclockwise rotation, caused by Coriolis Effect)
- Occluded Front -Affects Mid-Latitudes (United States)
- Dangerous because of T-Storms, Hail, Blizzards Tornadoes
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Hail
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Blizzards
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Label the Fronts and draw arrows to show their direction of movement.
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Hazardous Weather and Safety
What two biggest examples of bad weather first come to mind?
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Hurricanes
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Tornado
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Typhoons Cyclones
LOW
Hurricanes
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*Evacuate*, head for high ground
Cover / Board Up Windows
Head for strongest nearby structure
Get to the lowest possible level (Underground if possible)
*Make sure you have emergency food and water*
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http://www.ultimatechase.com/Tornado_Video.htm
Tornado videos
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Weather Map 1. Synoptic (a map that describes current weather and is.. . used for prediction)
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END
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Weather Changes
Air
pre
ssu
re
decreases
Warm air rises because it is less dense. The warmer the air, the less the pressure
decreases
Re
lati
ve
hu
mid
ity
Temperature
Temperature
Warm air can hold more water vapor. Since the “capacity” increased, the relative humidity decreases.
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De
nsi
ty
Temperature
decreases
Warm air rises because it is less dense the cold air
decreases
Look at page 14 of the Earth Science Reference Tables - the water vapor concentration
Wat
er
vap
or
Altitude
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decreases
ESRT pg 14 – Temperature chart
Tro
po
sph
ere
Te
mp
era
ture
Altitude
Altitude ESRT pg 14 – Temperature chart
Pre
ssu
re
decreases