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    LEE-SIDE FRONTOGENESIS IN THE ROCKY MOUNTAINS

    Source: Monthly Weather Review:;1961:;volume( 089 ):;issue: 005::page 163
    Author:
    CARLSON, TOBY N.
    DOI: 10.1175/1520-0493(1961)089<0163:LFITRM>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The development and motion of fronts associated with lee-side troughs on large mountain barriers has been investigated. These fronts differ from ordinary cold fronts in their horizontal temperature field, which is characterized by a sinusoidal thermal ridge. The thermal ridge intensifies, while remaining stationary with respect to the mountains, and moves eastward upon the approach of a Pacific cold front. An equation is derived, showing that changes in the thermal pattern can be described by changes in a potential thermal vorticity equation, which consists of three terms: (1) one representing an advection of the potential thermal vorticity by the 500-mb. wind; (2) one representing the advection of 500-mb. absolute vorticity by the thermal wind; and (3) a purely orographic term. An idealized sinusoidal model of the thickness pattern is used in conjunction with the prognostic equation to explain the development and motion of lee-side thermal ridges. Actual examples from synoptic maps are chosen to corroborate the theory. The conclusions are: (1) the thermal ridge will develop when the surface flow is such as to produce large-scale descent on the lee slopes of the mountains; (2) no thermal ridging will appear when the 500-mb. ridge lies east of the lee slopes; (3) thermal ridging will appear with the approach of a 500-mb. ridge from the west; and (4) the thermal ridge will move eastward upon the passage of the 500-mb. ridge.
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      LEE-SIDE FRONTOGENESIS IN THE ROCKY MOUNTAINS

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4197515
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    contributor authorCARLSON, TOBY N.
    date accessioned2017-06-09T15:56:48Z
    date available2017-06-09T15:56:48Z
    date copyright1961/05/01
    date issued1961
    identifier issn0027-0644
    identifier otherams-57204.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4197515
    description abstractThe development and motion of fronts associated with lee-side troughs on large mountain barriers has been investigated. These fronts differ from ordinary cold fronts in their horizontal temperature field, which is characterized by a sinusoidal thermal ridge. The thermal ridge intensifies, while remaining stationary with respect to the mountains, and moves eastward upon the approach of a Pacific cold front. An equation is derived, showing that changes in the thermal pattern can be described by changes in a potential thermal vorticity equation, which consists of three terms: (1) one representing an advection of the potential thermal vorticity by the 500-mb. wind; (2) one representing the advection of 500-mb. absolute vorticity by the thermal wind; and (3) a purely orographic term. An idealized sinusoidal model of the thickness pattern is used in conjunction with the prognostic equation to explain the development and motion of lee-side thermal ridges. Actual examples from synoptic maps are chosen to corroborate the theory. The conclusions are: (1) the thermal ridge will develop when the surface flow is such as to produce large-scale descent on the lee slopes of the mountains; (2) no thermal ridging will appear when the 500-mb. ridge lies east of the lee slopes; (3) thermal ridging will appear with the approach of a 500-mb. ridge from the west; and (4) the thermal ridge will move eastward upon the passage of the 500-mb. ridge.
    publisherAmerican Meteorological Society
    titleLEE-SIDE FRONTOGENESIS IN THE ROCKY MOUNTAINS
    typeJournal Paper
    journal volume89
    journal issue5
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(1961)089<0163:LFITRM>2.0.CO;2
    journal fristpage163
    journal lastpage172
    treeMonthly Weather Review:;1961:;volume( 089 ):;issue: 005
    contenttypeFulltext
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