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UPPER LEVEL TROUGH [6 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2013-01-30

English

Subject field(s)
  • Atmospheric Physics
DEF

A pressure trough existing in the upper air.

OBS

... often refers to such troughs only when they are more pronounced aloft than near the surface.

French

Domaine(s)
  • Physique de l'atmosphère
OBS

[...] souvent réservée aux thalwegs qui sont plus marqués en altitude que près de la surface.

OBS

talweg : Cette graphie, puisée des Rectifications de l'orthographe recommandées par le Conseil supérieur de la langue française, est attestée dans le Petit Robert (2004).

Spanish

Campo(s) temático(s)
  • Física de la atmósfera
DEF

Vaguada de presión existente en la atmósfera superior.

OBS

Este término se reserva a menudo a las vaguadas más marcadas en altitud que cerca de la superficie.

Save record 1

Record 2 2012-12-20

English

Subject field(s)
  • Atmospheric Physics
CONT

What causes the negative tilt?(1) Strong middle and upper level winds wrapping around the base of the trough.(2) A strong jet streak near the base of a trough.(3) A ridge to the east of the trough(like a sideways inverted trough).(4) Occlusion of low pressure.

French

Domaine(s)
  • Physique de l'atmosphère

Spanish

Save record 2

Record 3 2012-12-12

English

Subject field(s)
  • Atmospheric Physics
CONT

... if the upper level trough axis(500 mb and 300 mb) is located at a significantly different location than the low level trough axis(850 mb and 700 mb), then the trough is referred to as TILTED WITH HEIGHT.

French

Domaine(s)
  • Physique de l'atmosphère

Spanish

Save record 3

Record 4 2012-11-14

English

Subject field(s)
  • Atmospheric Physics
CONT

However, if the upper level trough axis(500 mb and 300 mb) is located at a significantly different location than the low level trough axis(850 mb and 700 mb), then the trough is referred to as TILTED WITH HEIGHT.

French

Domaine(s)
  • Physique de l'atmosphère

Spanish

Save record 4

Record 5 2012-10-31

English

Subject field(s)
  • Atmospheric Physics
CONT

What causes the negative tilt?(1) Strong middle and upper level winds wrapping around the base of the trough.(2) A strong jet streak near the base of a trough.(3) A ridge to the east of the trough(like a sideways inverted trough).(4) Occlusion of low pressure.

Key term(s)
  • trough base

French

Domaine(s)
  • Physique de l'atmosphère

Spanish

Save record 5

Record 6 2006-03-18

English

Subject field(s)
  • Atmospheric Physics
DEF

An area of low pressure caused by very warm, dry air.

CONT

Heat lows or thermal troughs often build north along the coasts of California and Oregon in the summer. Thermal troughs can cause "east winds" in the Washington and Oregon Cascades. If however, a relatively strong disturbance in the upper atmosphere moves across the NW, it will force the thermal trough east of the Cascades. In most cases, a moderate to strong push of marine air will follow, along with strong, gusty, west winds along the east slopes of the Cascades. Gusty winds and thunderstorms can be associated with the passage of a thermal trough.

CONT

A front may have troughing along its length, but not all troughs are frontal! Indeed, not all troughs have ’weather’ associated with them in the cloud/rainfall sense. Lee troughs found downwind of a major range of hills/mountains are often cloudless, and thermal troughs forming over land during the day due to mesoscale heating may only be found by careful drawing of isobars: if the air is dry and/or stable, little significant cloud will be associated with this feature.

OBS

trough : A feature on a weather map where mean sea level pressure(or upper contour heights) are lower than surrounding areas of the atmosphere, with a ’V’ shape to the isobars/contours evident in the pattern. Often associated with unsettled/cloudy weather, but not always.

French

Domaine(s)
  • Physique de l'atmosphère
OBS

thalweg (s'écrit aussi talweg) - trough : Axe de basses pressions prolongeant une dépression. Les isobares sont en forme de V. Son passage est marqué par une brusque rotation du vent (grain).

OBS

talweg : Cette graphie, puisée des Rectifications de l'orthographe recommandées par le Conseil supérieur de la langue française, est attestée dans le Petit Robert (2004).

Spanish

Save record 6

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