Font size
WorksheetsMET - Stability
Total questions: 21
Worksheet time: 11mins
What is it called when air continues to move away from its original position after being disturbed?
Positively Stable
Negatively stable
Neutrally stable
Convection stability
What is a parcel of air that is forced up a hill and then returns to a lower altitude after crossing the ridge called?
Stable
Unstable
Neutrally stable
Negatively stable
What does the stability of air mainly depend on?
Select all that apply
Temperature lapse rate of the air
Elevation of the terrain
Adiabatic lapse rate
Wind strength
What is Environmental Lapse Rate?
1.5 degrees per 1000ft
Temperature increasing with height due to an inversion, fixed figure
Temperature reducing with height due to pressure reducing, at 30º fixed figure
Temperature reducing with height due to warming from below, not a fixed figure
Which has the steepest ELR?
Orange
Blue
Red
Impossible to tell
What is the DALR?
1.5 degrees / 1000ft
2 degrees / 1000ft
3 degrees / 1000ft
Not a fixed value
When will dry air be stable?
ELR = 1 degree per 1000ft
ELR = 5 degrees per 1000ft
ELR = 3 degrees per 1000ft
SALR = 1.5 degrees per 1000ft
Which is the steepest ELR?
1 degree per 1000ft
2 degree per 1000ft
3 degree per 1000ft
4 degree per 1000ft
What is the SALR?
1.5 degrees per 1000ft
2 degrees per 1000ft
3 degrees per 1000ft
Not a fixed value
ELR is 2 degrees per 1000ft. Is the saturated air stable or unstable?
Stable
Unstable
What type of cloud is expected from stable saturated air?
Cumuliform
Stratiform
Cirrus
Altocumulus
What does thermal rising mean?
Air forced to rise up a hill
Air rising above the thermal pools
Air forced to rise due to solar radiation
Air rising due to heating from Earth's surface
Atmospheric conditions show HZ, DZ, and inversions the air is likely to be ______ and flying conditions ______
stable, turbulent
unstable, turbulent
stable, smooth
unstable, smooth
Which value would determine that an atmosphere is CONDITIONALLY UNSTABLE?
ELR of 1°C per 1000 ft
ELR of 2°C per 1000 ft
ELR of 3°C per 1000 ft
ELR of 4°C per 1000 ft
Select the set of words that when added to the following text will produce a true statement.
When considering the definition of steepness of the ELR …
a shallow ELR will indicate a less stable environment than that with a steep ELR
a steep ELR will indicate a less stable environment than that with a shallow ELR
What type of cloud is most likely to form when moist air is cooled adiabatically in an area with an ELR of 1°C/1000 ft?
unstable, convective, cumuliform cloud
Cloud with vertical rather than horizontal development
stable, advective layered, stratiform cloud
Select the ELR that indicates the atmosphere is conditionally stable?
6˚C per 2000 feet
18˚C per 9000 feet
1˚C per 5000 feet
2.5˚C per 2000 feet
What is the temperature and dew point at sea level, east of the Alps in the following circumstance?
A moist westerly wind blows over the Alps 9000’ high. On the west coast at sea level the temperature is 12°c and the cloud base 1000’ AMSL. Precipitation takes place in the west and a cloud base at 5000’ forms on the eastern side of the ranges
TT = 15°C / DP = 7°C
TT = 15° C / DP = 5°C
TT = 18° C / DP = 3°C
TT = 18° C / DP = 1°C
Given the following data, what will be the air temperature at sea level on the eastern side of the New Zealand Southern Alps when a westerly wind is blowing?
· At Hokitika aerodrome on the west side the sea level wind temperature is 12°C and its dewpoint is 6°C.
· The alps average 6000’ in height
· precipitation occurs on the west coast, reducing the dewpoint to 3°C on the lee side of the Alps over the Canterbury Plains
13º
14º
15º
16º
What is the scientific word that describes the process (of temperature change) that occurs where no energy (heat) is gained from or lost to the surroundings?
Adriatic
Adiabatic
Anabatic
Asthmatic
If the saturated temperature is -3ºC, the environmental temperature is -15ºC and the dry temperature is -21ºC at the top of a hill, is the area stable, conditionally stable or unstable?
stable
conditionally stable
unstable
