Transcript Severe Weather

Severe Weather
Chapter 24.2
Thunderstorms
► Rain,
thunder, lightning, wind
► 3 stages:
 Cumulus stage – cumulus clouds formed
 Mature stage – cloud rises, condensation
continues, dark cumulonimbus forms, rain, hail,
updrafts and downdrafts
 Dissipating stage – strong downdrafts stop
updrafts
Lightning
► Upper
part of cloud carries positive charge
and lower part carries a negative charge.
► Spark travels from one to the other.
► When lightning occurs, air is heated and
expanded rapidly causing the sound of
thunder.
Hurricanes
► Low
pressure area over warm water
► As warm, moist air rises, it spirals due to
the Coriolis Effect
► Warm, moist air condenses and forms
clouds which gives off a lot of latent heat
► This heat warms the upper air and causes a
high pressure area (the eye)
Tornadoes
► Produced
in thunderstorms that are
supercells
► The updrafts are cut-off by winds entering
the storm
► http://science.pppst.com/weather/weatherf
orecasting.html
http://www.thefutureschannel.com/dockets/realworld/lightning/
Review ch 24 for test
► #1-17
Q and A
► What are isotherms?
► What air masses move eastward toward
Europe?
► What happens when lower layers of air are
warmed?
► What are the 4 types of air masses?
► What
is a radiosonde?
► Define air mass
► Compare storms that develop at warm
fronts and cold fronts
► Be able to recognize each type of front by
definition
► Know the stages of a thunderstorm
► What do doppler radar and satellite images
help us to create?
► When is a severe weather watch issued?
► What
does radar use to determine the
velocity and location of objects?
► What are the following items used for?
► 1. wind vane
► 2. barometer
► 3. anemometer
► 4. thermometer
► What attributes are shown by a station
model?
► What
do scientists use to convey information
on a weather map?
► What symbols are used to weather maps to
indicate air pressure centers?
► Be able to draw a picture comparing the
formation of a cold front to a warm front