7-Level C

1.

1 point

Which atmospheric occurrence is not a type of lifting mechanism for convection?

Convection

Decompression

Frontal lifting

Orographic lifting

2.

1 point

The inputs to the velocity azimuth display algorithms are

mean radial velocity and base reflectivity

base relfectivity and spectrum width

mean radial velocity and spectrum width

mean radial velocity and celocity cross section

3.

1 point

For the Weather Service Radar (WSR)-88D to generate a base reflectivity product, the antenna must complete

one elevation slice

at least two complete volume coverage patterns

an entire volume coverage pattern

one complete 360 circle

4.

1 point

What factor is evident above the inversion with a Type I airmass?

Rapid drying

Moisture Increase

Turbulence

Condensation

5.

1 point

What weather characteristic does the 700mbs no change line usually line up with?

Trough axis

850 mb warm ridge

Surface front

Low-level jet

6.

1 point

when the Doppler zero line has a noticeable S-shaped pattern, winds are considered to be

increasing with height

from 270 degrees

veering with height

backing with height

7.

1 point

Which product is used in the detection and location of rotating thunderstorms and in determining wind field characteristics

Severe weather analysis

Severe weather probability

Base reflectivity

Base radial velocity

8.

1 point

What number of feet must the freezing level be for the most precipitation to reach the surface as snow?

1,200

1,300

1,000

1,100

9.

1 point

What does a >+1 on the Showalter stability index suggest?

Moderate stability

Strong instability

Strong stability

Moderate instability

10.

1 point

Outflow boundaries may be seen on the Weather Service Radar (WSR)-88D even when no colouds are present because

a gradient in the refractive index due to density differences that exist with the boundary

precipitable water is present although it is not visible to the human eye

the WSR-88D can detect returns of greater than +18dBZ

low-level wind shear is usually present with the boundary, making it more visible

11.

1 point

What atmospheric event does a negative convective available potential energy indicate?

Downward vertical motions

Increased warm moist air advection

Upward vertical motions

Decreased cold dry air advection

12.

1 point

Vertically integrated liquid (VIL) algorithms display VIL values for storms based on

water droplet size converted to water vapor values

water droplet size converted to liquid water content

reflectivity datea converted to water vapor values

reflectivty data converted to liquid water content

13.

1 point

At which pressure level is strong wind needed for thunderstorms to become severe?

850 mb

300 mb

700 mb

500 mb

14.

1 point

what many hours is the database for the user selectable precipitation product limited to?

30

24

36

48

15.

1 point

What severe weather synoptic pattern's airmass is typically Type III?

Type C, overrunning

Type A, dry line

Type D, cold core

Type B, frontal

16.

1 point

How far ahead of a cold front do pre-frontal squall lines from?

25 to 125 nautical miles

50 to 150 nautical miles

25 to 125 statute miles

50 to 150 statute miles

17.

1 point

What statement is not a use of the composite reflectivity product?

It can be used as a quick check on the overall reflectivity pattern

It can be used to show the 3-D structure of the reflectivity pattern

It provides an instant snapshot of the most important reflectivity features.

It is the first step in identifying significant weather features

18.

1 point

Which type of airmass features maritime polar air overrunning continental tropical air between 5,000 and 8,000 feet above the surface?

Type IV Inverted V

Type I Great Plains

Type III Pacific Coast

Type II Gulf Coast

19.

1 point

The maximum number of hours that the user selectable precipitation product can be generated for is

30

12

24

36

20.

1 point

Embedded thunderstorms are detected by the Weather Service Radar (WSR)-88D quite well because

it uses airborne radar technology to seek out these stroms

the storms move much faster than the surrounding precipitation

its 10cm wavelength can see through the stratiform precipitation

the storm moves much slower than the surrounding precipitation

21.

1 point

Which zone is not a type of surface convergent zone?

Frontal boundary

Dry line

Land breeze front

Outflow boundary

22.

1 point

The echo tops product is based on data from what other product?

Base reflectivity

Base velocity

Vertically Integrated liquid

Spectrum width

23.

1 point

A limitation of the storm total precipitation product is that

gives us a limited post storm analysis

has trouble with large-scale features

has trouble with small-scale features

displays a total precipitation accumulations

24.

1 point

The storm total precipitation product provides continuously updated information on precipitation accumulations within how many nautical miles of the radar?

240

120

200

124

25.

1 point

Which type of airmass has cold air at all levels?

Type II Gulf Coast

Type III Pacific Coast

Type I Great plains

Type IV Inverted V

26.

1 point

When does the maximum severe activity occur with a major cyclone?

A few hours after sunrise to maximum heating

Just before and after maximum heating

Only during maximum heating

From time of maximum heating to a few hours after sunset

27.

1 point

Which type of airmass is tropical in origin and generally warm and moist?

Type I Great Plains

Type IV Inverted V

Type III Pacific Coast

Type II Gulf Coast

28.

1 point

What number of nautical miles is the optimum effective range of the mesocylconic detection algorithm

32

65

240

124

29.

1 point

What weather occurrence does a severe weather threat index of 650 indicate?

No severe weather - winds too strong

Severe thunderstorms likely, chance of tornadoes

Tornadoes nearly always occur

Severe thunderstorms and tornadoes likely

30.

1 point

what wind speeds do you focus on at the 200 and 300 mb levels for severe weather analysis?

76 knots

90 knots

86 knots

80 knots

31.

1 point

What parameters are the two most important to analyze at 700 mb?

No-change line and dry-air intrusion

No-change line and wind maximums

Wind maximums and dew point temperatures

Dew point temperatures and dry-air intrusion

32.

1 point

The echo tops product is very useful in

identifying bounded weak echo regions

showing the presenc of vertical tilt within a storm

depicting the true cloud tops within 124 nautical miles

assessing the possibility of hail damage

33.

1 point

What weather feature is commonly found south of the center of a low pressure system and is indicated by a relatively cloud-free region?

Dry slot

Dry line

Warm front

Cold front

34.

1 point

In straight line flow, what quadrants are the main diffluent areas of a jet maximum?

Left front and right rear

Left and right rear

Left rear and right front

Left and right front

35.

1 point

A strongly tilted storm may cause what kind of vertically integrated liquid values to be displayed?

Taller

Higher

Lower

Shorter

36.

1 point

Which airmass is cold with surface temperatures ranging from 50F to 68F, the relative humidity commonly exceeding 70% at all levels up to at least 500mb and average windspeeds of 15kts and 50kts at 500mb

Type III Pacific Coast

Type II Great Plains

Type I Gulf Coast

Type IV Inverted V

37.

1 point

The velocity azimuth desplay winds profile provides

an alphanumeric list of wind velocities by height

a graphic display of wind velocities at various ranges

a graphic display of wind velocity at one azimuth

a time-height profile of wind velocity at a pre-determined range

38.

1 point

What does a lifted index (1.1) greater than zero indicate?

Stability

No severe weather - winds too strong

Severe weather likely, chance of tornadoes

Instability

39.

1 point

the pectrum width product is most effective when

overlaid on composite reflectivity

used alone

used with other products

desplayed in 16 data levels

40.

1 point

Which concept should be considered when trying to determine hail size?

Strength of the convergence aloft

Rotation in teh mid-levels of the storm

Rotation at the base of the strom

Strength of the updraft

41.

1 point

What kind of dew-point temperature difference should exist across a dry line?

>10 F degrees

<10 C degrees

<10 F degrees

>10 C degrees

42.

1 point

Why is tornadic vortex signature detection beyond 55 nautical miles difficult

Beam broadening

Scintillation

Ducting

Beam wander

43.

1 point

which decibal (dBZ) value is considered the approximate precipitable/non-precipitable threshold?

-18dBZ

+30 dBZ

+18 dBZ

-30dBZ

44.

1 point

Where is the geographic area known as the "Great Plains" located?

West of the Rocky Mountains

East of the Appalachian Mountains

Between the Mississippi River and the Rocky Mountains

Between the Appalachian Mountains and the Missouri River

45.

1 point

Which quadrant in the jet max should you look for positive vorticity advection?

Left rear

Left front

Right rear

Right front

46.

1 point

The melting level is displayed on the composite reflectivity product as a

circular pattern of higher reflectivities

straight line of higher reflectivities

series of spots that show ice forming on the radome

series of ellipses centered over each snow shower

47.

1 point

What does positive vorticity advection indicate?

Convergence or downward vertical motion

Divergence or downward vertical motion

Convergence or upward ertical motion

Divergence or upward vertical motion

48.

1 point

What does the line echo wave pattern (LEWP) signature mean to a forecaster?

Continued thunderstorm development is certain but severe weather is unlikely

High pressure is forming and the threat of severe weather has ended

The current state of the atmosphere is much too stable for severe weather development

A favorable environment exists for severe weather development

49.

1 point

In what tornado-producing airmass do tornadoes most frequently occur in families, with paths that are commonly long and wide?

Type I, Great Plains type

Type III, Pacific Coast type

Type II, Gulf Coast type

Type IV, Inverted "V" type

50.

1 point

What is an advantage that the user selectable precipitation product provides over the storm total and three-hour precipitation products?

Accumulation amounds are available for a 124 nautical mile area

Gaps of precipitation will not affect amounts

Data is presented in 16 levels

A product is available every volume scan