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PRE-FRONTAL FOG [1 record]

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Record 1 2004-04-07

English

Subject field(s)
  • Atmospheric, Climatic and Meteorological Phenomena
DEF

Fog in advance of a warm front, caused mainly by the increase of moisture in the underlying cold air resulting from the evaporation of pre-frontal rain.

CONT

Prefrontal (warm front) fogs occur in stable continental polar (cP) air masses when precipitating warm air overrides the colder air. The rain raises the dewpoint in the cP air mass sufficiently for fog formation. Generally, the wind speeds are light, and the area most conducive to the formation of this type of fog is one between a nearby secondary low and the primary low-pressure center. The northeastern area of the United States is probably the most prevalent region for this type of fog. Prefrontal fog is also of importance along the Gulf and Atlantic coastal plains, the Midwest, and in the valleys of the Appalachians.

Key term(s)
  • pre frontal fog

French

Domaine(s)
  • Phénomènes météorologiques, climatiques et atmosphériques
DEF

Brouillard formé à l'avant d'un front chaud, principalement dû à l'augmentation de l'humidité de l'air froid par évaporation de la pluie préfrontale.

Key term(s)
  • brouillard pré-frontal

Spanish

Campo(s) temático(s)
  • Fenómenos meteorológicos, climáticos y atmosféricos
DEF

Niebla, formada por delante de un frente cálido, formada principalmente al aumentar la humedad en el aire frío por la evaporación de la lluvia prefrontal.

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