Met 4

14問 • 1年前

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To best determine general forecast weather conditions covering a wide geographic area, the pilot should refer tp

Graphical Forecasts for Aviation (GFA).

The U.S. High-Level Significant Weather Prognostic Chart forecasts siginificant weather for what airspace?

FL250 to FL630

The Surface Analysis Chart depicts

actual frontal positions, pressure patterns, temperature, dewpoint, wind, weather, and obstructions to vision at the valid time of the chart.

The difference found by subtracting the temperature of a parcel of air theoretically lifted from the surface to 500 milibars and the existing temperature at 500 milibars is called the

lifted index.

On a Surface Analysis Chart, the solid lines that depict sea level pressure patterns are called

isobars.

Which provides a graphic display of both VFR and IFR weather?

Weather Depiction Chart.

Hatching on a Constant Pressure Analysis Chart indicates

windspeed 70 knots to 110 knots.

Which chart provides a ready means of locating observed frontal positions and pressure centers?

Surface Analysis Chart.

When total sky cover is few or scattered, the height shown on the Weather Depiction Chart is

base of the lowest layer.

Why does the wind have a tendency to flow parallel to the isobars above the friction level?

Coriolis force tends to counterbalance the horizontal pressure gradient.

WIth regard to windlfow patterns shown on surface analysis charts; when the isobars are

close together, the pressure gradient force is greater and wind velocities are stronger.

On a Surface Analysis Chart, close spacing of isobars indicates

strong pressure gradient.

Dashed lines on a Surface Analysis Chart, if depicted that the pressure gradient is

weak.

Which weather chart depicts conditions forecast to exist at a specific time in the future?

12-Hour Significant Weather Prognostic Chart.

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