Download Weather - Warren Hills Regional School District

Name
(lass
Date
Weather
Section
1 Whatisweather?
A. Weather is the stateof the
at a specifictime and place.
. , and moisture in
t. Includessuch conditionsas air pressure,wind,
the air.
a. The
evaporateswater into the atmosphereforming clouds;water
returns to Earth as rain or snow; the Sun also
air.
2. Temperatureis a measureof
movement.
a. The Sun'senergycausesair moleculesto move rapidly; temperaturesare
and it feels
b. When lessof the Sun'senergyreachesair molecules,they move lessrapidly and
it feels
3. Wind-air
moving in a
a. As the Sun heatsair, it expands,becomesless
rises,and has
atmosphericpressure.
b. Cooler air is
and sinks,causing
c. Air moves from
E
U;
pressureareasto
atmosphericpressure.
pressureareas,causlng
wind.
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(D
E
o
4. Humidity-the
=
*
I
amount of
a. Warmer air can hold
Co
5. Relative humidity-the
o
in the air
water vapor,tending to make it more humid.
amount of water vapor in the air compared to what it can hold at a
temPerature
'o
=
a. When air cools,it can't hold as much water vapor,so the water vapor
(o
j
I
to a liquid or forms ice crystals.
t
g
(1
o
-the temperatureat which air is saturatedand condensationforms
o
()
oA
o
o
b0
'E
t.
Clouds form asair is forced upward and cools.Then the water vapor condensesin tiny dropletsthat remain suspendedin the air.
Weather33
Name
Date
Class
D. The shapeand height of clouds vary with temperature,pressureand the
in the atmosphere.
l. Shape
a.
-smooth, evensheetsor layersat low altitudes
b.
-pury,white
clouds,often with flat bases
-high, thin, white, featheryclouds made of ice crystals
2. Height
a.
b.
-high clouds
-middle-elevation clouds
-low
c.
3.
clouds
clouds are dark and so full of water that sunlight can't penetratethem.
E. Precipitation-
falling from clouds
l. When
in clouds combine and grow large enough,precipitation
falls to Earth.
2. At
determineswhether the dropletsform rain, sno% sleet,or hail.
Section
2 Weather
Patterns
A. Because
changes.
and
ci
-:
move in the atmosphere,weatherconstantly
U''
.0)
c
o
E
=
=
*
(o
()
l. Air mass-a largebody of air with propertieslike the part of
over which it formed
2. Highs and lows
q)
-c
a. Stormy weatheris associatedwith
b. Fair weatheris associatedwith
pressureareas.
'o
.>
pressureareas.
(o
=
=
c. Air pressureis measuredby a
B. Front-a
3
betweentwo different air masses
l. Clouds,precipitation,and
o)
o
o
occur at frontal boundaries.
@
a. Cold front-where
air advancesunder
b. Warm front-where
air advancesover
2.
front-involves three air massesof different temperatures
3.
front-air massesand their boundariesstop advancing
34 Weather
-c
b0
alr
alr
Name
Class
Date
C, Severeweather
l. Thunderstormsoccur along warm, moist air massesand at
a. Warm, moist air is forced rapidly upward, where it coolsand
b. Strong updrafts of warm air and sinking, rain-cooledair causestrong
2. Lightning
a. Movement of air inside a storm cloud causesparts of the cloud to
become
b. Current flows betweenthe regionsof oppositeelectricalcharge,forming a
3. Thunder-lightning
the air, causingit to expandrapidly and then
contract,forming sound waves
4.
a violent, whirling wind that movesin a narrow path over land
5.
a large,swirling, low-pressuresystemthat forms over tropical oceans
6. Blizzard-a winter storm with strong winds, cold temperatures,and low visibility, that lasts
more than
hours.
7. Severeweathersafety
0
.q)
C
(o
E
o
=
-oI
O
c.)
c
meansconditions are favorabletor severe
a. A National WeatherService
weatherto develop.
d
b. A
Section
3
A.
meansthat severeweatherconditions alreadyexist.
Weather
Forecasts
study and predict the weather.
c
'o
:>
B. The National WeatherServicemakes
(u
=
I
i
g
q)
o
c
I
1.
show weatherconditions at a specificlocation.
2. Temperatureand pressure
a. Isotherms are lines on a weathermap connectingpoints of equal
o
_c
.s0
b. Isobars are lines on a weathermap that connectpoints of equal atmospheric
3. Weather fronts move from
to
Weather35