MET Q11 - Thunderstorms Flashcards
The diameter of a typical tornado is
Select one:
a.in the order of 10 km
b.only a few metres
c.about 2 to 6 km
d.100 to 150 metres
d.100 to 150 metres
What causes the global variation in electrical potential between the ionosphere and the earth’s surface?
Select one:
a.Position of the sun at aphelion and perihelion
b.Adiabatic effects
c.Height of the tropopause
d.Distribution of thunderstorms
d.Distribution of thunderstorms
The mature phase of a thunderstorm is characterised by
Select one:
a.Precipitation
b. updraughts only
c.downdraughts only
d.cloud base lifting
a.Precipitation
The conditions required for a thunderstorm to develop are
Select one:
a.unstable, humid atmosphere
b.high atmospheric temperature and low humidity
c.Clear skies with low humidity
d.stable atmosphere with high atmospheric temperature
a.unstable, humid atmosphere
A gust front is
Select one:
a.another name for a cold front
b.formed by the cold air outflow from a thunderstorm
c.characterized by heavy lightning
d.normally encountered directly below a thunderstorm
b.formed by the cold air outflow from a thunderstorm
A microburst typically
Select one:
a.forms in the building phase of a thunderstorm
b.develops from a column of rotating air
c.affects an area at the surface up to 4km wide
d.accompanies all thunderstorms
c.affects an area at the surface up to 4km wide
Types of thunderstorms are
a.orographic, frontal and air-mass
b.thermal, inversion and frontal
c.tornado, frontal and squall line
d.frontal, downburst and orographic
a.orographic, frontal and air-mass
What type of thunderstorm characteristically develops day or night is
Select one:
a.orographic thunderstorm
b.air-mass thunderstorm
c.frontal thunderstorm
d.Tornado
a.orographic thunderstorm
What is the typical speed of horizontal movement of a tornado and what is the average wind speed in the funnel?
Select one:
a. 60kts100-150kts
b. 64kts200kts
c. 20-40kts200kts
d.200kts20-40kts
c. 20-40kts200kts
With which type of cloud and thunderstorms are tornadoes normally associated?
Select one:
a.Cumulonimbus Super cell
b.CumulusSingle cell
c.CumulonimbusSingle cell
d.NimbostratusSuper cell
a.Cumulonimbus Super cell
A thermal thunderstorm is most likely to develop
Select one:
a.ahead of a cold front
b.in a mountainous region
c.over the ocean in summer
d.over a central landmass in summer
d.over a central landmass in summer
In line with the guidelines set out by ICAO, thunderstorm cells should be avoided by
Select one:
a.20nm laterally and 5000ft vertically
b.10,000ft vertically and 20nm laterally
c.20nm vertically and 5nm laterally
d.10,000ft vertically and 10nm laterally
a.20nm laterally and 5000ft vertically
