Chapter 7

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normal slope for a cold front

1:100

Anvil Top

A distinguishing feature of thunderstorms.

Air mass

A larger body of air (500-1600 miles across in diameter) with relatively uniform temperature and moisture, typically with a homogenous source origin is called?

A wave cyclone

A midlatitude cyclone is also properly termed ________.

25-50

A tornado advances at a rate of speed of ________ kilometers per hour.

Thunderstorms

Accompany hurricanes, tornadoes, extratropical cyclones and cold fronts.

1,600

An average air mass is on the order of ________ kilometers in diameter.

a few hundred

An easterly wave is on the order of ________ kilometers long.

A

Artic/Antarctic - Antarctica, Artic Ocean and fringes, and Greenland. [ Very cold, very dry, very stable ]

60 degrees

As a rule, thunderstorms are unknown poleward of ________ latitude.

Mid latitude anticyclone

Calm, fair weather is most likely to result from a/an ________.

Vertical tilt with height

Characteristic that distinguishes hurricane from mid latitude cyclones in the northern hemisphere.

Stationary Front

Common boundary when neither air mass displaces the other.

Cold front

Compared to a warm front, has a much steeper gradient.

Tornadoes

Considered to be the most destructive forces of atmospheric disturbances.

cP

Continental Polar - High latitude plains of Eurasia and North America. [ Cold, dry, very stable ]

cT

Continental Tropical - Low-latitude deserts. [ Hot, very dry, unstable ]

Front

Develops between air masses.

Origin of Air Masses

Develops by remaining over a uniform land or sea surface long enough to acquire the temperature/humidity/stability of the surface below.

E

Equatorial - Oceans near the equator. [ Warm, very moist, unstable ]

westerlies

Extratropical cyclones and anticyclones function as migratory perturbations in the ________.

Characteristics of Atmospheric Disturbances

Extremely variable in size, migratory and transient, brief duration, and relatively predictable in weather conditions.

Central States

Has the highest incidence of tornadoes

Tropical Depression

Has wind speeds less than 33 knots (61 km or 38 mph) but has developed a closed wind circulation pattern.

Tropical Storm

Has winds between 34 and 63 knots (63-117 km or 39-73 mph).

Hurricane

Has winds greater than 64 knots (119 km or 74 mph).

10

Hurricane formation is very rare within ________ degrees of the Equator.

above the ground

In an occluded front, the warm air sector is ________.

Tropical Cyclones

Intense, low pressure disturbances that develop in the tropics and occasionally move poleward into the mid latitudes.

Properties of an air mass

Large, relatively uniform, travel as recognizable entity, must modify as it leaves its source region.

Easterly Wave

Long but weak migratory, low pressure system that may occur almost anywhere between 5 and 30 degrees latitude.

Mid latitude Anticyclones

Major disturbance in the general flow of the westerlies. Referred to as a 'HIGH' (H). Typically larger than a mid latitude cyclone and generally moves west to east. Clockwise in Northern Hemisphere and counterclockwise in Southern Hemisphere.

mP

Maritime Polar - Oceans in vicinity of 50 - 60 degrees N and S latitude. [ Cold, moist, relatively unstable ]

mT

Maritime Tropical - Tropical and subtropical oceans. [ Warm, moist, of variable stability ]

Exist behind cold fronts

Mid latitude anti-cyclones in the northern hemisphere

Galveston, TX

North America's greatest hurricane disaster took place at ________.

cP

Of the list below, the coldest air is bound to be associated with a/an ________ air mass.

cold

On a weather map, a symbol consisting of triangles arranged along one side of a line indicates a(n) ________ front.

cold

On the average, ________ fronts move the fastest of all fronts.

Localized Severe Weather

Other parts of the globe. Short-lived. Mostly thunderstorms and tornadoes.

Mid Latitude Disturbances

Principal battleground of tropospheric phenomena: where polar and tropical air masses meet, where most fronts occur, and where weather is most dynamic and changeable from season to season and from day to day.

Mid latitude cyclones

Probably most significant of all atmospheric disturbances. Typically has a diameter of 1600 km. Counterclockwise converging circulation. Attracts cool air from the north and warm air from the south.

Hurricane->Tropical storm->Tropical depression

Ranks tropical cyclones in order of decreasing wind speed.

Wind Shear

Refer to significant change in wind direction or wind speed with increasing elevation.

block

Stable anticyclones act as a ________ to moving cyclones.

Sinking air

The "eye" of the hurricane is a zone characterized by ________.

East to west

The average directional movement of hurricanes is ________.

Southwest to northeast

The average directional movement of tornadoes is ________.

one week

The average hurricane exists, on the average, for about ________.

"tropical cyclone"

The correct designation for a hurricane is as a/an ________.

Thunderstorms usually dissipate because

The down draft chokes off the updraft.

middle

The global westerly wind zone most heavily impacts the ________ latitudes.

September

The month most likely for a hurricane to occur in the Northern Hemisphere is ________.

Mature

The most active phase of a thunderstorm is called the ________ phase.

Rossby Waves

The movement of middle latitude cyclones is determined by the jet stream and ________.

1:200

The slope of a warm front generally averages about ________.

convective

Thunderstorms are violent ________ storms accompanied by thunder and lightning.

Tornadoes

Tiny storms in diameter usually with the most extreme pressure gradient.

Low

Tornadoes, although erratic in their pathways, are always characterized by ________ pressure.

Calm

Unlike tornadoes, the eye of a hurricane is normally...?

cyclones

Upper air divergence is most closely associated with surface ________.

Stationary

When neither air mass displaces the adjacent one, their boundary is called a(n) ________ front.

The U.S.

Which country is the most likely place on Earth for a tornado to occur?

1 week

Which of the following best represents the length of the life cycle of a typical midlatitude cyclone?

Occluded Front

formed when a cold front overtakes a warm front.

Cold Front

forms where an advancing cold air mass meets warmer air.

Warm Front

forms where an advancing warm air mass meets colder air.

The typical air mass in place for New Orleans, LA

mT

Tropical Disturbances

same weather day after day, week after week and month after month. Almost the only breaks are provided by transient atmospheric disturbances. Mostly tropical cyclones - known as hurricanes.

U.S. Midwest

the least likely zone of formation for a large air mass


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