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An ensemble forecast goes further and further into the future, the forecast lines can become scrambled. Such a chart is often referred to as a​


A) spaghetti plot.​
B) ​chaos chart.
C) ​multilinear plot.
D) ​filament chart.
E) ​shifting plot.

F) A) and B)
G) None of the above

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Suppose a computer model uses more closely spaced grid points and a greater number of data points, and thus has better resolution. What would this model be particularly useful in forecasting?​


A) ​large scale winds
B) a ​vorticity maximum
C) ​longwave directions
D) ​temperatures at the surface
E) ​the relative position of highs and lows

F) A) and E)
G) A) and D)

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Weather forecasts are commonly grouped according to how far into the future the forecast extends.

A) True
B) False

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​The greatest improvement in forecasting skill during the past 30 years has been made in forecasting


A) ​snowstorms along the eastern seaboard.
B) ​the development of middle latitude cyclones in the Pacific Ocean.
C) ​severe storm warnings for hurricanes and tornadoes.
D) ​the movement of warm and cold fronts.
E) ​maximum and minimum temperature 6 to 10 days into the future.

F) A) and E)
G) B) and D)

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Lines of equal pressure change are called ____________________.​

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Describe the data and tools that a meteorologist assembles prior to making a weather forecast.

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​In the course of a single workday, a ty...

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The ____________________ is a chart that shows how one or more weather variables has changed at a station over a given period of time.​

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​An accurate forecast


A) ​always shows skill.
B) ​may or may not show skill.
C) ​never shows skill.
D) ​requires complex computer equipment.
E) ​can only be accomplished after many years of experience.

F) B) and D)
G) A) and B)

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​A weather forecast for the immediate future that employs the trend method is called


A) ​nowcasting.
B) ​extrapolation.
C) ​first order forecasting.
D) ​linear forecasting.
E) ​persistence forecasting.

F) None of the above
G) B) and C)

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A blocking high is a


A) ​high pressure system and accompanying ridge that changes location quickly.
B) ​high pressure system and accompanying ridge that persists in the same location for many days.
C) ​high pressure system and accompanying ridge that produces torrential rains.
D) ​ridge associated with a low pressure system.
E) ​trough associated with a low pressure system.

F) A) and B)
G) C) and D)

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​If you wanted to make a persistence forecast of minimum and maximum temperatures for a particular city, which type of chart would be most helpful?


A) ​surface chart
B) ​meteogram
C) ​500 mb chart
D) ​adiabatic chart
E) ​Doppler radar display

F) A) and B)
G) A) and C)

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​What would be the least accurate forecast method of predicting the weather two days into the future during changeable weather conditions?


A) ​trend method
B) ​​persistence forecast
C) ​analog method
D) ​prediction by weather types
E) ​numerical weather prediction

F) All of the above
G) B) and C)

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Warm advection is most likely to occur​


A) ​in the center of a cut-off low.
B) ​from the surface up to the 500 mb level ahead of an advancing warm front.
C) ​behind a cold front.
D) ​where the winds back with height.
E) ​on the western side of a shortwave trough at the 500 mb level.

F) C) and D)
G) All of the above

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​The analog method is often referred to as ____________________.

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pattern re...

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Probably the easiest weather forecast to make is a statistical forecast.

A) True
B) False

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How are computer-generated weather forecasts prepared?​

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The models are programmed into the compu...

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Describe four methods of forecasting the weather and give an example for each one.​

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Persistence: a prediction that future we...

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The final forecast chart representing the atmosphere at a specified future time is called a(n) ____________________, or, simply, a(n) ____________________.​

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prognostic...

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Warm advection occurs when the​


A) ​wind veers (changes direction in a clockwise manner) with height.
B) ​wind backs (changes direction in a counterclockwise manner) with height.
C) ​isotherms are parallel to the winds.
D) ​wind veers with height and the isotherms are parallel to the winds.
E) ​Sun angle is 90 degrees.

F) C) and D)
G) B) and D)

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​A persistence forecast could be quite accurate when


A) ​a frontal system approaches your location at constant speed.
B) ​you are positioned in the middle of a large, stationary air mass.
C) ​the weather has been unusually cold for several days.
D) ​upper level winds blow straight from west to east.
E) ​when a warm front is approaching.

F) All of the above
G) A) and D)

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