1-24.
When changes in intensity of
troughs and ridges aloft are
forecast, the time differential
chart is most valuable in
forecasting which of the following
features?
1.
Surface pressure centers
2.
Single height change centers
with no apparent history
3.
Height change centers due to
convergence or divergence not
associated with a short wave
trough or ridge
4.
Height change centers with a
well-defined history that are
associated with short wave
troughs and ridges
1-25.
You are trying to determine the
change in intensity of a long wave
trough and you notice that the warm
air advection on the east side of
the trough is less than the cold
air advection on the west side.
What intensity change, if any,
should you forecast for this
trough?
1.
It will fill snowy
2.
It will deepen
3.
It will fill rapidly
4.
None
1-26.
Which of the following conditions
is favorable for the filling of a
trough?
1.
The strongest winds are on the
west side of the trough
2.
The strongest winds are on the
east side of the trough
3.
The strongest winds are at the
crest of the associated ridge
4.
The strongest winds are in the
southern quadrant of the trough
1-27.
Upper height falls are associated
with low-speed winds approaching
straight or cyclonically curved
contours.
1.
True
2.
False
1-28.
What seasonal movement and
intensity changes occur with the
semipermanent high-pressure
centers?
1.
A poleward movement and
decrease in intensity in the
summer
2.
An equatorward movement and
decrease in intensity in the
summer
3. A poleward movement and
increase in intensity in the
summer
4.
An equatorward movement and
increase in intensity in the
summer
1-29.
A blocking high at 500-hPa has
several closed contours, and the
strongest winds in these contours
are to the south in the easterlies.
What forecast should you make for
this high?
1.
It will move slowly eastward
2.
It will move slowly westward
3.
It will move rapidly eastward
4.
It will remain stationary
1-30.
Intensification of a blocking high
will occur under which of the
following conditions?
1.
During high zonal index
conditions
2.
When cold air advection and
mass convergence occur in the
lower troposphere
3.
When warm air advection and
mass divergence occur in the
upper troposphere
4.
When cold air advection and
mass convergence occur in the
upper troposphere
1-31.
Concerning the extrapolation of
closed lows, which of the following
statements is NOT accurate?
1.
Extrapolation should only be
used for their movement
2.
A central height trend over
time should be established
3.
Changes in intensity may be
determined
4.
Extrapolation should be used in
conjunction with other methods
4