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Depends on which lines you're talking about. If you're talking about circles that cover the map (often in black or gray) then those are isobars which are lines of equal pressure (ie. the barometer reads the same everywhere along a line)....If you're talking about a blue line with triangles, that means a cold front with cooler/drier air behind it. A red line with round barbs means a warm front with warmer air behind it. There are many others, but these are the most common seen on television weather forecasts.

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7y ago
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9y ago

Lines on a weather map show wind direction and speed and temperature gradients. These are important pieces of information for weather prediction.

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11y ago

What do the black dotted liness means damaing winds heaving rains floods tornados hall storm severe weather threats

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10y ago

The troughs on a given weather maps are usually represented by the dotted lines.

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12y ago

A trough of low pressure.

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12y ago

they are isobars and they measure wind!

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Q: What do the brown dotted lines on a weather map mean?
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