Exam 2 Flashcards by Meryl Resurreccion

On average how many tornadoes occur in the US each year

1400

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What percentage of the world’s tornadoes occur in the US?

75%

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Within which state was the deadliest tornado in US history?

Illinois

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Supercell updrafts typically appear as

Rain free cloud bases

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Mammatus clouds are typically associated with
a. Large hail
b. Damaging wind
c. Tornadoes
d. None of the above

d. none

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Which type of supercell typically produces the most tornadoes?

Classic supercells

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What creates horizontal roll that gets suck up into the storm

Wind shear

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Creation of a wall Cloud

Sometimes rotates
Lowered cloud based beneath the updraft
Air hits ground, spreading out, some rotation, that air is going underneath the updraft and get sucked up, cand create wall cloud
The Forward flank downdraft creates the wall cloud

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Tornado → what kind of flank draft

rear flank downdraft

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Shelf clouds –

mcs

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Tornado outline
(ice skating metaphor) put hands up → spin faster

Cold air sinking and hitting ground, creating horizontal vortex along the surface
Titled and stretched

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The rotation in tornadoes forms through what two processes?

Tilting and stretching

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Tornadoes typically develop from

Wall clouds

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Which of the following is most closely tied to tornadogenesis

Rear-flank downdraft

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What is the rotating updraft with a supercell thunderstorm called?

mesocyclone

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What’s the deciding ingredient on whether a thunderstorm will be severe or not?
a. Sufficient moisture
b. Evapotranspiration
c. Significant wind shear

c. Significant wind shear

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Pic of cloud, like a long line, could be curvy, darkness like a spaceship about to overhead
a. Hinge cloud
b. Wall
c. Pole
d. Countertop
e. Shelf Cloud

e. Shelf Cloud

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As a cloud like a shelf cloud passes overhead, what should you prepare to feel?
a. A blast of very warm humid air
b. Nothing, this cloud ill pass over you and barely kick up a breeze
c. A violent rapidly-rotating, tornado like wind will accompany this cloud and cause a lot of damage
d. A gusty burst of cooler air

d. A gusty burst of cooler air

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Which of following isn’t a requirement for a thunderstorm to be considered severe?
a. Frequent cloud-to-ground lightning
b. Hail largenr than 1 inch in diameter
c. Thunderstorm winds

a. Frequent cloud-to-ground lightning

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Below are the conditions on a day in May. the NWS did NOT forecast severe thunderstorms on this day. whY>?
a. The lifted index was +4
b. Wants a lifted index that’s negative
c. The dewpoint temperature was 71F
d. There was a cold front that was coming through the region
e. The winds near the surface were 10 mph while the winds in the middle atmosphere were 60 mph

a. The lifted index was +4

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If all the energy from a single lightning bolt could be captured, how long could this electricity power your house?

6 hours

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In which direction does the bright flash of light that you see during lightning strike travel?

From ground to the cloud

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Value of the lifted index

Know that parcel line on right is negative, unstable, storms
Vice versa

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The atmosphere is said to be unstable if parcel’s temp is warmer than the surrounding environmental temperature
True or false

true

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A negative lifted index indicate an unstable atmosphere True or false

true

The stratosphere is defined by a large temp inversion. Is the stratosphere a stable or unstable layer in the atmosphere

Stable

Which body of water is the primary moisture source for thunderstorms in the midwest Pacific Atlantic Great lakes Gulf of mexico Mahomet aquifer

Gulf of mexico

Which is the cloud base? LCL: lifting condensation level LFC: level of free convection EL: equilibrium level

LCL: Lifting Condensation Level

What is the top of the cloud? LCL: lifting condensation level LFC: level of free convection EL: equilibrium level

Equilibrium level

What is the bubbly part of the cloud? LCL: lifting condensation level LFC: level of free convection EL: equilibrium level

LFC: level of free convection

Which will be found at the highest pressure? LCL: lifting condensation level LFC: level of free convection EL: equilibrium level

Lifting condensation level

Which will be found at the lowest pressure? LCL: lifting condensation level LFC: level of free convection EL: equilibrium level

Equilibrium level

Thunder always occurs with lightning. You may just be too far away to hear it. true or false

true

What is the crucial ingredient for the formation of lightning such that without this ingredient, lightning does not form in thunderstorms? Ice dust large rain drops (greater than 2 mm in diameter) counterclockwise turning winds with height. flux capacitor

ice

In what direction does the return stroke travel in the most common type of cloud-to-ground lightning strike?

from the ground to the cloud

Between the years 2001 and 2010, who or what started more forest fires?

humans

In a cloud that is capable of producing a cloud-to-ground lightning strike, where does the negative charges accumulate in the cloud? near the top of the cloud near the center of the cloud near the bottom of the cloud on the right side of the cloud on the left side of the cloud

near the bottom of the cloud

Is the air a good conductor or electricity or a good insulator?

insulator

Which of the following correctly lists the order of events for a cloud to ground lightning strike? dart leader, stepped leader, return stroke, second return stroke stepped leader, dart leader, return stroke, second return stroke dart leader, return stroke, second return stroke, stepped leader stepped leader, return stroke, dart leader, second return stroke stepped leader, dart leader, return stroke, second return stroke

stepped leader, return stroke, dart leader, second return stroke

What is the formal name of the cloud that produces a thunderstorm?

cumulonimbus

Which of the following is not a requirement for the National Weather Service (NWS) to determine if a thunderstorm is severe? frequent cloud to ground lightning hail bigger than 1 inch in diameter. 58 mph winds tornado

frequent cloud to ground lightning

For a thunderstorm to become severe, 4 ingredients are needed. Which ingredient listed below is NOT needed? strong wind shear a source of moisture a trigger mechanism a conditionally unstable atmosphere warm surface air temperatures (T>72F)

warm surface air temperatures (T>72F)

What is the name of the cloud at the top of a strong thunderstorm?

anvil cloud

During which of the three stages of development of an ordinary thunderstorm does the downdraft develop?

mature stage

The downdraft of a thunderstorm can be described as a current of descending air laden with precipitation falling from the storm. Are downdrafts relatively warm or cold?

cold

On radar images depicting thunderstorms, you can often see a "radar fine line - gust front". What type of cloud is often associated with this feature?

shelf cloud

What type of cloud is typically found on the underside of an anvil in strong thunderstorms?

mammatus cloud

Which type of thunderstorm is responsible for producing the majority of tornado reports in the US?

supercell

Which is larger, the MCS (mesoscale convective system) or the supercell?

mcs

True or False: Supercell thunderstorms always rotate.

true

What is the name assigned to the rotating updraft of a supercell thunderstorm?

mesocyclone

When a tornado takes on a rope-like appearance, at what stage in the life cycle is this tornado?

shrinking and decaying stage

Tornadoes are most frequent during the month of __________ around ____ o'clock in the __________.

may 5th, afternoon

Supercell thunderstorms always rotate. true or false

true

The "low-level jet" is an important feature of the environment within which supercells and tornadoes form. This airstream is necessary for two primary reasons - first to help create the needed wind shear and second to transport warm moist air into the storm. From what direction does the low-level jet come from?

south

What is a mesocyclone?

the rotating updraft within a supercell thunderstorm

If a tornado were to form within a supercell, from which of the following clouds would it emerge from?

wall cloud

Select the answer where the clouds are ranked from smallest to largest.

funnel cloud, wall cloud, mesocyclone, anvil

Myth or Fact: The exact location of a lightning strike can be predicted.

myth

Myth or Fact: People struck by lightning carry an electrical charge and should not be touched.

myth

Myth of Fact: If you are caught outdoors during an electrical storm one of the safest places to be is in your car.

fact

Myth or Fact: If you feel your hair stand on end during an electrical storm, crouch down low to the ground – you could be struck by lightning.

fact

Myth or Fact: A typical lightning strike is 5 km long and 2 to 3 cm wide.

fact

Exam 2 Flashcards

(63 cards)