pressure-jump line

A fast-moving line of sudden rise in atmospheric pressure, followed by a higher pressure level than that which preceded the jump; under suitable moisture conditions, sudden instability of the atmosphere conducive to the formation of thunderstorms can result.

Related terms:

• pressure jump
• center jump
• instability line
• prefrontal squall line
• squall line
• pressure altitude
• pressure pan
• pressure gradient
• reservoir pressure
• central pressure