1) Troughs along a frontal zone are the reason for a wind shift during frontal p

Question

1) Troughs along a frontal zone are the reason for a wind shift during frontal passage. True or false

2) An elongated region of warm air aloft (above ground) shows up on an isobaric map as higher heights and a ridge; the colder air shows as lower heights and a trough. True or false

3) _________are boundaries that separates dry, dense air and moist, lighter air. They are most often experienced in the central and southern Great Plains and can initiate severe thunderstorms.

4) In considering how wind will interact with topography (e.g., the shape, height, distribution of terrain -mountains, etc.) one must consider velocity of the wind, which is represented only by speed (e.g. 10 mph, etc.) and not relative direction of the wind. True or false

Explanation / Answer

Question:

1) Troughs along a frontal zone are the reason for a wind shift during frontal passage. True or false?

2) An elongated region of warm air aloft (above ground) shows up on an isobaric map as higher heights and a ridge; the colder air shows as lower heights and a trough. True or false?

Answer for above 2 questions:

True

Explanation:

How are cold fronts developed?

In the northern hemisphere, a cold front usually causes a shift of wind from southwest to northwest clockwise, also known as veering, and in the southern hemisphere a shift from northwest to southwest (anticlockwise, backing). Normally, cold fronts can be marked by these characteristics:

*provided there is sufficient moisture.

Weather phenomenon Prior to the passing of the front While the front is passing After the passing of the front Temperature Warm Cooling suddenly Steadily cooling Atmospheric pressure Decreasing steadily Lowest, then sudden increase Increasing steadily Winds

• Southwest to southeast (northern hemisphere)
• Northwest to northeast (southern hemisphere)

Gusty; shifting

• North to west, usually northwest (northern hemisphere)
• South to west, usually southwest (southern hemisphere)

Precipitation/conditions* Light patchy rain can be produced by stratocumulus or stratus in the warm sector. In summer, sometimes thunderstorms if a preceding squall line is present. Prolonged rain (nimbostratus) or thunderstorms(cumulonimbus): depends on conditions. Showers, then clearing Clouds* Often preceded by cirrus, cirrostratus then altostratus like a warm front (but usually with smaller amounts of these clouds). Areas of cirrocumulus and altocumulus within cirrostratus and altostratus more commonly seen than at a warm front. Larger cumulus clouds under the higher cloud types than at a warm front, where stratocumulus and cumulus humilis usually occur. Some of these cumulus clouds may produce showers ahead of the front. Cumulonimbus and cumulus congestus producing frequent showers, with a sheet of upper altostratus, through which the sun can sometimes be seen. Less commonly nimbostratus occurs with continuous rain. Patchy altocumulus or stratocumulusand higher cirrus clouds along with fast moving stratus fractus then eventually scattered cumulus and sometimes cumulonimbus. Visibility* Fair to poor in haze Poor, but improving Good, except in showers Dew Point High, steady Sudden drop Falling

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