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WX 301 Exam 2 Questions With Verified Detailed Answers
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WX 301 Exam 2 Questions With Verified Detailed AnswersWith above mean sea-level pressure surface chart with isobars drawn and labeled. What
would be the most likely direction of the surface winds at the x, assuming typical values
of surface friction? Assume northern hemisphere - Answer From the west.
Figure above shows five environmental lapse rates (ELRs). What would happen to an air
parcel forced to rise from the surface in an atmosphere represented by ELR 3 (yellow
line)? - Answer it would continue rising
The following figure shows one field of wind observations in the northern hemisphere.
There are four cold fronts overlaid on the wind observations, but only one is correct
based on the winds alone. Which front below is most correct? - Answer D
Consider the following weather at location A:
Snow @ 00Z
Sleet @ 03Z
Freezing rain @ 06Z
Rain @ 09Z
Clearing skies at 12Z
The 00Z wind direction was NE. The 12Z wind direction was S.
What feature most likely pass over location A during this time period? - Answer warm
front
The polar jet tends to lie directly above regions of with - Answer strong temperature
contrast.
The atmosphere is typically most unstable _____. - Answer during the mid/late afternoon
,CAPE is defined as the area where the air parcel is warmer the environment between
the _______ and the _______. - Answer LFC; EL
A saturated parcel in a conditionally unstable layer is _____. - Answer unstable
At which level an air parcel begins to rise due to buoyancy alone? - Answer level of free
convection
Compared to the dry adiabatic lapse rate, the moist adiabatic lapse rate is most
different _____. Answer at warm temperatures (i.e., > 20C)
The standard environmental lapse rate is __________. Answer conditionally unstable
As unsaturated air parcels rise, they cool at the __________. Answer dry adiabatic lapse
rate
Above is an unspecified front dashed black line that is moving in the direction of the
arrow. Just to the east of the front the 1000-850mb thickness is 1330 meters dashed
line, while just to west, the 1000-850 mb thickness is 1270 meters. What type of front is
it? Hint: Think about the relationship between thickness and the average temperature of
the layer -Answer Warm front with warm air replacing cold air.
Surface low pressure centers tend to develop ___________ a 500 mb trough. - Answer to
the left of
The thickness (or height difference) between two pressure surfaces will be greatest
when the mean temperature of the layer is _________. - Answer colder than standard
The top of a thunderstorm typically occurs at the _________. - Answer Equilibrium level
Winds at the base of a trough tend to be ___________. - geostrophic
Which of the following set of index values would indicate the greatest potential for
, strong thunderstorms to develop? - LI = −7, KI = +36, CAPE = +3300
Which of the following forces causes wind? - Pressure Gradient Force
When crossing a warm front from the cold side to the warm side do you expect dew
point temperatures to increase or decrease? - Answer Increase, showing there is more
water vapor in the air behind the front.
Which of the following shows the greatest potential for severe thunderstorms. - Answer
LI = -7; KI = 43
For a mid-latitude cyclone to intensify,, there must be_____________ in the upper
levels-i.e., above the 500 mb level-directly overhead the surface low pressure center. -
Answer divergence
When the polar jet is aligned in a nearly straight west to east direction with very little
northward or southward flow, we refer to it as __________. - Answer zonal
Temperature inversions are _______ layers. - Answer absolutely stable
Which jet is higher in altitude? - Answer subtropical jet
Wind direction will generally be from the _________ ahead of a cold front and from the
_____________ behind of a cold front. - Answer southwest; west or northwest
What is "critical thickness" used as rule-of-thumb for the rain/snow line? - Answer 5400
m
When isobars on a surface map are very close the winds will be _____________ than if
they are far apart. - Answer faster
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