1-32.
A deep low is situated at 50°N, and
the closed contours are nearly
circular around the center.
The
strongest winds south of the low
have a speed of 50 knots, and from
these winds to the center of the
low is 5° of latitude.
The wind
speed to the north of the low is 30
knots.
According to the
Eccentricity Formula, this low
should move in what manner?
1.
Eastward at 5.5 knots
2.
Westward at 5.5 knots
3.
Westward at 1.8 knots
4.
Eastward at 1.8 knots
1-33.
Which of the following statements
is valid concerning the isotherm-
contour relationship of lows aloft?
1.
If isotherms and contours are
out of phase, lows will remain
stationary
2.
Cold air advection to the west
indicates weakening
3.
Warm air advection to the east
indicates filling
4.
Cold air advection to the west
indicates retrogression
1-34.
The Time-Differential chart shows
no height rises for a particular
ridge you are forecasting at the
500-hPa level.
The 300-hPa chart
indicates high-speed winds in the
northwestern portion of the ridge
approaching anticyclonically
curved, weak contours.
The
advection between the 1000- and
500-hPa levels in that portion of
the ridge is warm.
What should you
forecast for this ridge?
1.
The ridge should weaken slowly
2.
The ridge should intensify
3.
The ridge should weaken rapidly
4.
The ridge should remain at its
present intensity
1-35.
In forecasting the intensity of a
particular low, you discover that a
jet maximum is located to the west
of the low, and it is preceded by
another jet maximum downstream
beyond the southern periphery of
the low.
What should you forecast
for this low?
1.
The low should fill
2.
The low should intensify
rapidly
3.
The low should intensify slowly
4.
The low should remain at its
present intensity
1-36.
Which of the following conditions
is NOT an indication that a cutoff
low is forming aloft?
1.
Height falls are moving south
or southeastward
2.
Strong cold air advection is on
the west side of the trough
3.
Strong southwesterlies are
situated on the eastern side of
the trough
4.
Strong northerlies are situated
on the western side of the
trough
1-37.
In the construction of forecasted
500-hPa contours, the change in
intensity of a particular system is
correlated with all EXCEPT which of
the following factors to arrive at
specific values for these contours?
1.
The sign and the amount of rise
and fall in the centers
2.
Convergence and divergence at
500-hPa
3.
Advection of 50% of the
thickness gradient
4.
Convergence and divergence in
the 850- to 700-hPa stratum
1-38.
The comma-shaped cloud formation
found on satellite imagery is
normally the result of upward
motion produced by positive
vorticity advection.
1.
True
2.
False
1-39.
The 700-hPa chart is used in the
construction of an advection chart
for which of the following reasons?
1.
It is the most readily
available
2.
It contains data considered to
be the most accurate of any
upper-level chart
3.
It approximates the contours of
the mean wind vector between
the 1000- and 500-hPa levels
4.
It is considered to be the
steering level for cold core
highs
1-40.
What is the first step you should
take when forecasting the movement
of pressure systems?
1.
Consult your station’s
Forecaster’s Handbook
2.
Refer to your constructed 1000-
500-hPa thickness chart
3.
Note the past history of the
pressure system
4.
Note the thermal
characteristics of the pressure
system
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