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  2. Trough (meteorology) - Wikipedia

    en.wikipedia.org/wiki/Trough_(meteorology)

    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. Since low pressure implies a low height on a pressure surface, troughs and ridges refer to features in an identical sense as those on a topographic map. Troughs may be at the surface, or aloft, at ...

  3. Low-pressure area - Wikipedia

    en.wikipedia.org/wiki/Low-pressure_area

    Elongated areas of low pressure form at the monsoon trough or Intertropical Convergence Zone as part of the Hadley cell circulation. [39] Monsoon troughing in the western Pacific reaches its zenith in latitude during the late summer when the wintertime surface ridge in the opposite hemisphere is the strongest.

  4. Why could Helene trigger massive rainfall inland? Blame the ...

    www.aol.com/why-could-helene-trigger-massive...

    Forecasters say soon-to-be Hurricane Helene could undergo a Fujiwhara "interaction" with another storm over the south-central U.S., which the weather service refers to as a trough of low pressure ...

  5. Asiatic Low - Wikipedia

    en.wikipedia.org/wiki/Asiatic_low

    The Asiatic Low is a low-pressure trough which lies over southern Asia, during early summer. It is located roughly over India , heading over the Bay of Bengal . It is a major action centre for the Northern Hemisphere during that time of the year.

  6. Low-pressure system - Wikipedia

    en.wikipedia.org/wiki/Pressure_system

    The minima are called low-pressure areas, and the maxima are called high-pressure areas. A High is often shown as H , and a low is shown as L . Elongated areas of low pressure, or troughs, are sometimes plotted as thick, brown dashed lines down the trough axis. [ 24 ]

  7. Cold front - Wikipedia

    en.wikipedia.org/wiki/Cold_front

    A cold front is the leading edge of a cooler mass of air at ground level that replaces a warmer mass of air and lies within a pronounced surface trough of low pressure.It often forms behind an extratropical cyclone (to the west in the Northern Hemisphere, to the east in the Southern), at the leading edge of its cold air advection pattern—known as the cyclone's dry "conveyor belt" flow.

  8. Tropical wave - Wikipedia

    en.wikipedia.org/wiki/Tropical_wave

    2013's Tropical Storm Dorian as a tropical wave just north of Puerto Rico on July 29, 2013. A tropical wave (also called easterly wave, tropical easterly wave, and African easterly wave), in and around the Atlantic Ocean, is a type of atmospheric trough, an elongated area of relatively low air pressure, oriented north to south, which moves from east to west across the tropics, causing areas of ...

  9. Monsoon trough - Wikipedia

    en.wikipedia.org/wiki/Monsoon_trough

    August position of the ITCZ and monsoon trough in the Pacific Ocean, depicted by area of convergent streamlines in the northern Pacific. The monsoon trough is a portion of the Intertropical Convergence Zone in the Western Pacific, [1] [2] as depicted by a line on a weather map showing the locations of minimum sea level pressure, [1] and as such, is a convergence zone between the wind patterns ...

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