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AtSc > Test 5 > Flashcards

Test 5 Flashcards

1
Q

What is a thunderstorm?

A

A local storm produced by a
cumulonimbus cloud that is
accompanied by lightning and/or
thunder.

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2
Q

What is TS?

A

Thunderstorm

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3
Q

What is TSRA?

A

Thunderstorm with moderate rain

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4
Q

What is +TSRA?

A

Thunderstorm with heavy rain

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5
Q

What is -TSRA?

A

Thunderstorm with light rain

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6
Q

What are required conditions?

A
  1. Moisture
  2. Instability
  3. Lifting Mechanism
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7
Q

What is additionally required for severe long lasting thunderstorms?

A

A shear

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8
Q

In general what represents dew points sufficient enough for thunderstorms?

A

10C/50F

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9
Q

How is the temperature of the within the rising particle of air decided?

A

The parcel temperature depends on whether the air is unsaturated or saturated. Unsaturated air cools at the dry adiabatic lapse rate. Saturated air cools at the pseudo-adiabatic (or saturated adiabatic) lapse rate.

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10
Q

How is the environmental lapse rate determined?

A

The environmental lapse rate is measured by radiosondes twice a day and its varies considerably from day to day

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11
Q

What does the stability of the environment depend on?

A

The stability of the atmosphere depends on the lapse rate of the environment and the temperature within the rising parcel of air

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12
Q

When do shears change?

A

With the height of wind direction and wind speed

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13
Q

What are the stages of a thunderstorm?

A
  • Cumulus
  • Mature
  • Dissipating
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14
Q

What are characteristics of the cumulus stage?

A
  • Growing Stage
  • Updraft
  • Icing
  • Turbulence
  • No Precipitation
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15
Q

What are the characteristics of the mature stage?

A
  • Precipitation
  • Updraft
  • Downdraft
  • Greatest Intensity
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16
Q

What are the characteristics of the dissipating stage?

A

Downdrafts and light rain

17
Q

What is the definition of a severe thunderstorm?

A

By definition, a severe thunderstorm must meet one of three criteria:

  1. ) Damaging winds, or measured winds > 50 kts
  2. ) Hail, surface or aloft, > ¾ inch in diameter
  3. ) Tornado
18
Q

When is a watch issued?

A 
–	Issued when the risk
of hazardous weather
has increased
significantly
–	Occurrence, location
and/or timing is still
uncertain
–	Provides lead time
19
Q

What are two types of watches?

A

Severe thunderstorms

Tornado

20
Q

When is a warning issued?

A 
Issued when a
hazardous weather
event is occurring, is
imminent, or has a
very high probability
of occurring
21
Q

What are different types of warnings?

A

– Severe
Thunderstorm
– Tornado
– Flash Flood

22
Q

What is a wind shear?

A

Change in wind direction and/or

speed with height

AtSc (7 decks)

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