Gust fronts - before: Stock photos of gust fronts (shelf clouds or Arcus accessory clouds) as they appear on the forward edge, ahead of the cooler air and precipitation with a severe storm cloud complex.

  • A desert haboob or dust storm accompanies an outflow boundary
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  • A gust front brings a sudden change in the weather
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  • A gust front with an outflow boundary is moving in
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  • Wind shift boundary with bubbling cloud line in the lift zone
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  • A weak high based shelf cloud along an outflow boundary
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  • A shelf cloud stands out as a light line in the midst of black clouds
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  • An unusual shelf cloud along a gust front, with several layers
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  • Shading and structure of thunderstorm shelf cloud layers
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  • Storm gust front cloud progression: sharp-edged Arcus
    • W021821Z
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  • A light line of low cloud, warning that a storm is on the way
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  • Close view of low cloud flakes and ruffles on a gust front
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  • A close look at a gust front cloud shaped like a wedge
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  • Clouds are thickening and lowering as a strong squall line approaches
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  • Layered cloud on a cold front marks a sudden transition to cool air
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  • A layered cloud bank marks a transition to strong straight-line winds
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  • Advancing cold air undercuts rising towers on a flanking line
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  • Weakening storm outflow boundary with a thin gust front
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  • A long, multi-layered shelf cloud Arcus cloud ahead of a storm
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  • Contrasting storm clouds advance: bright anvil and dark shelf cloud
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  • Large-scale waves or lobes along the front edge of a gust front
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