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Meteorology > Thunderstorms > Flashcards

Thunderstorms Flashcards

1
Q

What is the definition for a thunderstorm?

A

One or more sudden electrical discharges

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2
Q

What are the three things needed for a thunderstorm?

A

Unstable air - moisture - trigger for rising air

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3
Q

During an initial stage of a storm what happens to the air?

A

Updraughts

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4
Q

How long does the initial stage of a thunderstorm last?

A

15-20mins

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5
Q

What happens to the air in the mature stage of a thunderstorm?

A

Up draughts and down draughts.

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6
Q

What weather occurs in the mature stage of a thunderstorm?

A

Precipitation,

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7
Q

What weather occurs in the mature stage of a thunderstorm?

A

Precipitation.

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8
Q

How long does the mature stage last in a thunderstorm?

A

15-30 minutes.

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9
Q

How long does the dissipating stage last for a thunder storm?

A

1.5 to 2 hours.

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10
Q

What is the direction of a thunderstorm?

A

Wind at 10000ft

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11
Q

What does a supercell cause?

A

Tornados

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12
Q

When are single cell thunderstorms formed?

A

Warm and humid summer days.

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13
Q

What is a mesoscale convective system?

A

Collection of thunderstorms that act as a system.

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14
Q

What is a mesoscale convective complex?

A

Large circular cluster of thunderstorms.

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15
Q

What does a gust front create?

A

Turbulence and roll clouds.

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16
Q

How long do micro bursts last for?

A

5mins

17
Q

How kong does a macro burst last for?

A

5-20mins.

18
Q

At what diameter does a microbirst become a macroburst?

A

4km.

19
Q

What occurs at low levels and has 50kts of wind?

A

Downbursts.

20
Q

What can virga generate?

A

Intense down draughts.

21
Q

What altitude is hail most likely in a cb?

A

Above FL200

22
Q

What can static electricity occur?

A

St Elmo’s fire

23
Q

What speed is a tornado?

A

200knots.

24
Q

What seasons do you see tornadoes?

A

Spring and summer.

25
Q

How high do dust devils climb?

A

650ft.

26
Q

What does a storm scope show?

A

Lightening

27
Q

Which of the following thunderstorms can be referred to as stationary thunderstorms?

A

Air mass

Meteorology (23 decks)

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