# The heavy precipitation event: As the pattern of enhanced tropical rainfall continues to shift further to the east and weaken, the deep tropical moisture plume extends from the subtropical central Pacific into the mid latitude trough now located off the west coast of North America.

The central Atlantic upper tropospheric trough, along with an upper-level low in the eastern Caribbean Sea, produced vertical wind shear over the hurricane and caused its winds to weaken to.

After an upper trough moved east, wind shear decreased, causing lower atmospheric pressures observations in Cozumel, Quintana Roo, Mexico.

When located within a monsoon region, this zone of low pressure and wind convergence is also known as the monsoon trough.

The location of the dryline may not be marked with a surface pressure trough or shift of the wind direction.

On September 1, there was significant uncertainty in the future intensity of Danielle, as a shortwave trough located northeast of the storm would either enhance outflow, causing strengthening, or increase wind shear, resulting in weakening.

It moved through an area of hostile wind shear, caused by a large upper-level low associated with a trough to the northeast of the Lesser Antilles.

After the passage of the trough line, the wind veers southeast, the humidity abruptly rises, and the atmosphere destabilizes.

Quickly after peaking, wind shear from the approaching trough weakened the hurricane, and by six hours after reaching peak intensity, the winds in Hurricane Kenna dropped to 150 mph ( 240 km / h ) after the eye nearly dissipated.

After maintaining its intensity for 24 hours, increased wind shear from an upper-tropospheric trough degraded the appearance of the deepest convection, and the eye became obscured from satellite images.

Sometimes, the region between two high pressure centers may assume the character of a trough when there is a detectable wind shift noted at the surface.

According to the AMS Glossary, it is " A pressure trough formed on the lee side of a mountain range in situations where the wind is blowing with a substantial component across the mountain ridge ; often seen on United States weather maps east of the Rocky Mountains, and sometimes east of the Appalachians, where it is less pronounced.

Most troughs bring clouds, showers, and a wind shift, particularly following the passage of the trough.

Simultaneously, the trough in the upper troposphere weakened, causing the wind shear in the area to relax, thereby allowing the new tropical depression to develop.

On May 15, a monsoonal trough associated with a low pressure area formed north west of the Philippines. On May 17 the low pressure area started to drift across northern philippines, and rapidly intensified into a tropical storm before quickly dissipating due to vertical wind shear on May 20. The remnants were soon absorbed by a non-tropical low on May 22.

The divergence over the near-equatorial trough leads to air rising and moving away from the equator aloft.

Hardly less important is the Ruwenzori Range, over, which lies east of the western trough.

He spends the night holding vigil over his armor, where he becomes involved in a fight with muleteers who try to remove his armor from the horse trough so that they can water their mules.

With the Intertropical Convergence Zone ( ITCZ ) swinging northward over West Africa from the Southern Hemisphere in April, heavy showers coming from pre-monsoonal convective clouds mainly in the form of squall lines also known as the north easterlies formed mainly as a result of the interactions of the two dominant airmasses in Nigeria known as the Maritime tropical ( south westerlies ) and the Continental tropical ( north easterlies ), begins in central Nigeria while the Monsoons from the south atlantic ocean arrives in central Nigeria in July bringing with it high humidity, heavy cloud cover and heavy rainfall which can be daily occurrence lasting till September when the monsoons gradually begin retreating southward to the southern part of Nigeria. Rainfall totals in central Nigeria varies from in the lowlands of the river Niger Benue trough to over along the south western escarpment of the Jos Plateau.

where Windmill Lane, the railway and the Grand Union Canal all intersect – the canal being carried over the railway line cutting below in a cast-iron trough and a new cast-iron road-bridge going over both.

The weather is temperate year-round, due to its location in the Isothermal Belt, a phenomenon that results when warmer air on the western side of the Appalachian Mountains blows over the mountains, leaving a trough where significant temperature inversions of 20 degrees Fahrenheit or greater can occur.

By 0600 UTC on August 20, Alicia had transitioned into an extratropical cyclone over northwestern Oklahoma, and by the next day it was no longer identifiable after merging with the trough over eastern Nebraska.

A westerly trough that had been influencing Alberto ’ s motion outran the storm, and a strong ridge developed to the north and west, causing the storm to turn abruptly to the south on August 15, and to complete a large loop over the open Atlantic.

The storm then took a sharp turn toward the northwest as a large, slow-moving mid-level trough was carving out over the eastern United States.

The decision to rely mostly on talented youngsters scouted trough all over the country quickly gave results – Partizan took three consecutive championship titles, in 1961, 1962 and 1963, the first title hat-trick in the league.

While Hales ’ work on the chemistry of air appears primitive by contemporary standards, its importance was acknowledged by Lavoisier, and Hales ’ invention of the pneumatic trough to collect gases over water was a major technical advance.

The trough is not fastened to the arches, but lugs are cast into the plates to fit over the rib arches to prevent movement.

What was cut was a short scene of Porky in a trough with a shovel broken over his head, burnt matches in his hooves, and money shoved in his hands, looking beaten up, and uttering: " T-t-they talked me into it.

The second tropical cyclone and first named storm of the 1972 Atlantic hurricane season, Agnes developed on June 14 from the interaction of a polar front and an upper trough over the Yucatán Peninsula.

When a steam locomotive passes at speed over the trough, its water scoop can be lowered, and the speed of forward motion forces water into the scoop, up the scoop pipe and into the tanks or locomotive tender.

In response to a deep trough over Appalachia, the hurricane veered northward, sparing the Bahamas, Florida, the Carolinas, and the Mid-Atlantic.

Friedman and Schwartz write: " From the cyclical peak in August 1929 to a cyclical trough in March 1933, the stock of money fell by over a third.

Around that time, a developing trough centered over the Eastern United States caused the storm to curve almost due northward and accelerate.

When this occurs over the tropics in concert with the Intertropical Convergence Zone, it is known as a monsoon trough.

After flowing over the mountain, a type of shock wave forms at the trough of the flow, and a sharp vertical discontinuity called the hydraulic jump forms which can be several times higher than the mountain.

The path resulted from its movement along the southern end of a trough over the western Atlantic Ocean.

On August 26, a strong frontal trough weakened the high pressure system to the storm's north, causing a turn to the north during the next few days.

The enormous sagging weight of Tharsis has generated tremendous stresses in the crust, producing a broad trough around the region and an array of radial fractures emanating from the center of the bulge that stretches halfway across the planet.

To its lower east flank, there is a chain of elliptical, or oval-shaped, pits, lined up down the center of a shallow trough.

A self guided tour will lead you trough the center.

Valhalla consists of a bright central region 360 km across, an inner ridge and trough zone and striking concentric rings extending up to about 1, 900 km from the center.

The inner trough zone extends up to 950 km from the center of Valhalla.

One of these forms a trough in the northern inner wall, with side walls that extend almost to the center of the floor.

Approximately 35 MYA, stresses in the continental plate in the center of the uplift caused the center to collapse, forming a trough between the Sawatch and Mosquito Range that is part of the larger Rio Grande Rift.

Alberto continued to the north-northeast in response to a short wave trough, and steadily strengthened as the convection became embedded around the center.

Wind shear associated with a trough and passage over cooler waters caused Enrique to begin weakening and the cyclone center soon became exposed.