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Meteorology
Chapter 12
Weather vs. Climate
Weather the current
state of the
atmosphere
Climate long-term
variations in
weather for a
particular area
The worst weather ever recorded in the
United States took place here at the weather
station atop Mt. Washington in the White Mts.
of New Hampshire.
Global Winds – complete the diagram below:
high
polar
easterlies
westerlies
trade
winds
low
Differences in heating (land vs. water, light vs. dark, rough vs. smooth) cause
differences in air pressure which creates winds.
During the day the
land heats up
faster, so in this
picture the winds
would be coming
from the
sea
____________.
High
Low
Sea breeze
Low
High
Land breeze
Low
High
High
Valley breeze
Low
Mountain breeze
Fronts Review
Which letter would have
thunderstorms?
B
Which letter would have
steady rains?
C
Which letter would have
warm, clear conditions?
D
Which letter would have
cold, clear conditions?
A
The lines of equal
air pressure shown
on this map are
isobars
called _________.
The closer together
they are, the
stronger
__________
the
winds.
cold front
front
warm front
wave cyclone
occluded front
stationary front
Use the pictures on the previous slide to help answer the
following questions about weather instruments.
E
C
A
B
F
D
Follow the steps below to locate a front and
isobars on the diagram to the right:
Step 1. Use wind direction to
locate the front.
1004
Step 2. Use temperatures to
identify the type of front.
1008
Step 3. Draw and label the
1004 isobar so that every
station below 1004 falls toward
the “low”.
Step 4. Draw and label the
1008 and 1012 isobars.
1012
Describe the weather conditions at each of the following cities:
Portland – winds SW at 10mph, overcast, drizzle, 34 degrees F
Atlantic City – winds N at 5 mph, partly cloudy, 36 degrees F
Chicago - winds NW at 20 mph, overcast, light snow, 29 degrees F
Chapter Review
Describe the weather conditions for each of the stations below:
air pressure
1010.2mb
air pressure
1007.4mb
air pressure
999.7mb
temp 55 degrees F
temp 80 degrees F
temp 30 degrees F
skies obscured by
light rain
partly cloudy skies
skies obscured by
moderate snow
winds south at 10
mph
winds NW at 25
mph
winds calm
Chapter Review (continued)
1. High pressure means skies will be ________.
clear
isobars
2. Lines of equal air pressure are called __________.
anemometer
3. The instrument that measures wind speed is an ________________.
cold
4. Thunderstorms would most likely be found along a ________
front.
semi-circles
5. The map symbol for a warm front are ____________.
6. Virginia is located in the _____________
Westerlies
wind belt.
sea
7. At the beach during the day the winds would come from the ________.
sinks
8. Cold air _________
because it is more dense.
clear
9. A rising barometer would signal __________
weather approaching.
climate
10. Long-term variations in weather for a particular area is ____________.