A trough is an elongated region of relatively low atmospheric pressure without a closed isobaric contour that would define it as a low pressure area
What is a trough used for? trough meaning.

What are troughs in weather?

Ridges and troughs are often mentioned on the weather forecast. A ridge is an elongated area of relatively high pressure extending from the center of a high-pressure region. A trough is an elongated area of relatively low pressure extending from the center of a region of low pressure.

What does the trough do?

Troughs are elongated regions where there is low pressure, and they typically occur before a cold front. A trough is often an indicator of coming clouds, showers, or a shift in the direction of the wind.

Which location shows a trough?

Troughs are found near low pressure areas while ridges are found near high pressure. Below is an example of what they tend to look like.

What causes high pressure ridges?

This is the upper level extension of a surface high pressure center, which is why ridges are also called upper level highs. Notice the relatively warm temperatures associated with the ridge. This is caused by the northward transport of warmer air in the lower troposphere.

How is a trough different from a crest?

The highest surface part of a wave is called the crest, and the lowest part is the trough. The vertical distance between the crest and the trough is the wave height.

What is sound trough?

Trough – the lowest point below the rest position. Amplitude – the maximum displacement of a point of a wave from its rest position.

What are peaks and troughs?

Peaks and troughs are the highest and lowest concentrations of a medication in an individual’s body. They are used to determine dosing intervals, or how much time should pass between each new administration of the drug.

What is a surface low?

An area on the earth’s surface where atmospheric pressure is at a relative minimum. Winds blow counter-clockwise around lows in the Northern Hemisphere but, due to friction with the earth’s surface, tend to cross constant pressure lines toward the low center.

What is a trough front?

Definition: A trough is an elongated region of relatively low atmospheric pressure, often associated with fronts. Unlike fronts, there is not a universal symbol for a trough on a weather chart. In the United States, a trough may be marked as a dashed line.

What causes a trough?

Formation. A trough is the result of the movements of the air in the atmosphere. In regions where there is upward movement near the ground and divergence at altitude, there is a loss of mass. The pressure becomes lower at this point.

Why is a stationary front called stationary?

Stationary Front This happens when two masses of air are pushing against each other, but neither is powerful enough to move the other. Winds blowing parallel to the front instead of perpendicular can help it stay in place. A stationary front may stay put for days.

What weather is caused by high pressure?

Low-pressure systems are associated with clouds and precipitation that minimize temperature changes throughout the day, whereas high-pressure systems normally associate with dry weather and mostly clear skies with larger diurnal temperature changes due to greater radiation at night and greater sunshine during the day.

What does a wave crest look like?

Waves have moving crests (or peaks) and troughs. A crest is the highest point the medium rises to and a trough is the lowest point the medium sinks to. Crests and troughs on a transverse wave are shown in Figure 8.2. … A crest is a point on the wave where the displacement of the medium is at a maximum.

What is the bottom of a transverse wave called?

Transverse waves have what are called peaks and troughs. The peak is the crest, or top point of the wave and the trough is the valley or bottom point of the wave.

What is the depressed portion of the wave called?

The single rise or depression of a wave are known as crest and trough. … The highest point in this motion or the rise is known as the crest, whereas the lowest point of the depression is called the trough.

Which are examples of a medium?

An example of a medium is a metal spoon sitting in a cup of hot tea that is too hot to touch. An example of a medium is a newspaper from the combined media form of newspapers, television, magazines, radio and the Internet. Medium is defined as something in the middle or in-between.

What creates the crests and troughs of a sound wave?

When sound waves strike the eardrum, it moves the eardrum inward (crest) and outward (trough). The ear converts the inward motion and the outward motion into electrical impulses, which are sent to the brain.

What is the peak of a transverse wave called?

Term (symbol)MeaningCrestHighest point on a transverse wave. Also called the peak.TroughLowest point on a transverse wave.ExpansionA point of maximum spacing between particles of a medium for longitudinal waves.CompressionA point of minimum spacing between particles of a medium for longitudinal waves.

What are troughs on a graph?

The opposite of peak in a graph – the lowest part of the line on a graph, between where it falls and rises.

What is trough nursing?

The trough level is the lowest concentration in the patient’s bloodstream, therefore, the specimen should be collected just prior to administration of the drug. The peak level is the highest concentration of a drug in the patient’s bloodstream.

How are trough levels drawn?

A trough level is drawn immediately before the next dose of the drug is administered. A peak level is drawn 1 to several hours after the drug is administered (depending on the drug).

What is considered a tropical storm?

Tropical Storm: A tropical cyclone with maximum sustained winds of 39 to 73 mph (34 to 63 knots). Hurricane: A tropical cyclone with maximum sustained winds of 74 mph (64 knots) or higher.

What causes wind?

Wind is the movement of air, caused by the uneven heating of the Earth by the sun and the Earth’s own rotation. … Differences in atmospheric pressure generate winds. At the Equator, the sun warms the water and land more than it does the rest of the globe.

What is a surface cyclone?

Low Pressure Centers also known as cyclones. A surface low pressure center is where the pressure has been measured to be the lowest relative to its surroundings. That means, moving any horizontal direction away from the Low will result in increasing pressure.

What does a high pressure ridge look like?

Low-pressure troughs are identified by brown dashed lines while ridges of high pressure are identified by brown zigzag lines. The majority of inclement weather occurs between the trough and the downwind (eastward) ridge while fair weather occurs between the ridge and the downwind trough.

What is trough in geography class 9?

a trough is an elongated (extended) region of relatively low atmospheric pressure often associated with fronts.

What is ridge and Col?

A col, also called saddle point or neutral point, is in meteorology, the point of intersection of a trough and a ridge in the pressure pattern of a weather map. It takes the form of a saddle where the air pressure is slightly higher than that of the low-pressure regions, but lower than that of the anticyclonic zones.

Does a recession follow a trough?

A recession begins just after the economy reaches a peak of activity and ends as the economy reaches its trough. Between trough and peak, the economy is in an expansion.

What type of front is stalled or still?

A stationary front is a non-moving (or stalled) boundary between two air masses, neither of which is strong enough to replace the other.

What happens when a cold front meets a warm front?

When a cold front overtakes a warm front, it creates what’s called an occluded front that forces warm air above a frontal boundary of cooler air masses.

Where is Continental Polar?

Continental polar (cP) or continental arctic (cA) air masses are cold, dry, and stable. These air masses originate over northern Canada and Alaska as a result of radiational cooling. They move southward, east of Rockies into the Plains, then eastward.

Where do we find the warmest areas on earth?

Death Valley, California, USA The aptly named Furnace Creek currently holds the record for hottest air temperature ever recorded. The desert valley reached highs of 56.7C in the summer of 1913, which would apparently push the limits of human survival.

Does air move from high to low pressure?

The Short Answer: Gases move from high-pressure areas to low-pressure areas. And the bigger the difference between the pressures, the faster the air will move from the high to the low pressure. That rush of air is the wind we experience.

Why was the temperature low when the sky was cloudy?

However, if skies are cloudy, some of the sun’s rays are reflected off the cloud droplets back into space. Therefore, less of the sun’s energy is able to reach the earth’s surface, which causes the earth to heat up more slowly. This leads to cooler temperatures.