Download Name - Circle

Sec.: __
Name:
_
Experiment: Forecasting Movement of Weather
Systems (E. Science 9-16-3bb)
Purpose: To learn how to forecast movement of
weather systems.
Materials: Weather Cycler Yesterdays map
internet - (http://www.comet.ucar.edu/dstreme)
Methods & Results: (Circle correct choice in parentheses
. to properly complete the sentence).
\ 1. Examine the Weather Cycler with the slide
pushed all the way in so the L is displayed in the
'large winder. It shows that when looking down on
the low - pressure system, surface winds blow
(clockwise and outward, counterclockwise and
inward ) about the center.
2. preCipitation generally occurs in a broad band ahead of the ( warm, cold) front and
in a narrow band along the (warm. cold) front.
3. To the south and southeast of the center of the low, surface winds are likely to
produce (warm. cold) air flow.
4. To the west and northwest of the center of a low, surface winds are likely to produce
(warm. cold) air flow.
5. Illustrate the passage of a warm front by observing the atmospheric changes in the
lower windows below B as the Weather cycler slide is pulled out. With the passage of
a warm front, the air temperature usually rises and the dew point would be expected to
(fall. rise ). With the approaching warm front, atmospheric pressure would (fall. rise ),
and following the front, (fall. slight rise or remain steady).
6. A shift in wind direction usually accompanies the passage of a front. The Weather
Cycler map shows that with passage of the warm front, surface winds shift direction
from the
to the
_
7. Ahead of the surface warm front, warm and humid air rides up and over a wedge of
cooler air. As the ascending warm air expands and cools, its relative humidity
( increases. decrease ). and clouds may form. Most cloudiness associated with a
warm front develops over a broad area, often extending hundreds of kilometer, L
ahead. behind ) the front. From these clouds, light to moderate precipitation typically
falls for 12 to 24 hours or longer.
8. As a cold air mass advances and a warm air mass retreats, the colder, denser air
forces the warmer, lighter air to ascend either along or just ahead of the cold front.
Uplift of warm air triggers cloud development and perhaps showery precipitation. In
some instances, uplift is so vigorous that thunderstorms develop. Typically, as shown
by the Weather Cycler, the band of clouds and precipitation associated with a cold
front is ( narrower, wider) than that associated with a warm front.
9. With passage of the cold front, surface winds shift direction from the
to
the
. After passage of a cold front, the air temperature usually falls and
the dew point would be expected to ( fall. rise ).
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Name:
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10. Place" B" before the cold front. With the approach of a cold front, air pressure
would (fall. rise) and following the front passage, it usually ( falls. rises ), rapidly.
11. Place" Bit before the cold front. According to the station models the air movement
is moving ( counterclockwise & inward. clockwise and outward ). This is ( consistent.
not consistent) with the hand twist model done four days ago in lab 9-16-2b.
12. Place the weather cycler pull out tab so that the H is in the middle of the window. If
you were located to the northeast of the H the winds would be coming from the
( northwest. southwest ), which will cause the temperature in the area to ( rise. fall ).
13. Because the cool air is moving in and this air mass is starting to warm up, the
relative humidity will ( rise. fall ). Because of this the weather stations to the northeast
of the high have ( 100. 0 ) percent cloud coverage.
14. With the weather cycler still positioned so the H is in the middle of the window, the
winds to the west of the H is coming from the ( northwest. south east), which will
cause the temperature in the area to ( rise. fall ).
15. Because the warm air is moving in and this air mass is starting to cool down the
relative humidity will ( rise. fall ). Because of this the weather stations to the west of the
H have (25 to 50. 0 ) percent cloud cover~ge.
16. According.to the station models the air movement is moving ( counterclockwise
and inward. clockwise and outward). This is ( consistent. not consistent) with the
hand twist model done four days ago in lab 9-16-2b.
17. Step outside and examine which way the wind is blowing. Then examine the
surface weather map and record where the nearest high or low pressure system is and
record its location in reference to ourselves.
Wind is blowing from the
.
A
pressure system is located to the
of us.
18. Explain why the winds are blowing in the direction they are based on the nearest
low or high pressure system:
_
19. Examine the surface weather map from yesterday, and then todays weather map.
Predict what will happen to the local fronts, pressure systems, and what the weather
will be in the next 24 hours.
front movements:
_
pressure movements:
_
weather prediction for tomorrow:
_
20. Find the station models on teday's weather map for Chicago, Illinois, and Houston,
Texas. Find the temperature, dew point, cloud coverage, wind direction, wind speed,
pressure, change of pressure, and precipitation at each location.
Chicago: __
of, __
of, __
% of cloud coverage, .__
wind direction,
__
speed of wind, __
mB, __
mB change,
precipitation type.
Houston: __
of, __
of, __
% of cloud coverage, __
wind direction,
__
speed of wind, __
mB, __
mB change,
precipitation type.
21. Now examine a current isobar map of the United States. Record the local time
and date of this map. time
date
_
22. Examine the isobar pattern near Chicago and Houston. Near Chicago the isobars
are ( close. far) from each other compared to Houston where the isobars are relatively
(close, far) from each other. Because of these findings we would predict that Chicago
has ( more. less) wind. This is ( consistent. not consistent) with results in question 20.