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cold front.
The appearance of cirrus clouds is an early sign of an approaching warm front.
shoreline recessing into ocean
Volcanoes don't approach. You might be thinking of a tornado.
cirrus clouds
Bob Kudzma is reporting on a cold front approaching, which may cause it to snow!
A cold front approaching Texas from the north.
cold front.
Cirrus clouds are followed by an approaching warm front.
The appearance of cirrus clouds is an early sign of an approaching warm front.
They stand for an approaching storm front. If I remember correctly, a red line means a warm front and a blue line means a cold front. The triangles show which direction the front is moving. Hope that helps.
shoreline recessing into ocean
If you know that a warm front is approaching, you can forecast when it will rain, and can cancel a barbecue. The warm front may have collected a lot of moisture as it passed over the ocean. Then, if it meets a cold front, rain will fall, or snow if in winter.
Volcanoes don't approach. You might be thinking of a tornado.
Road signs.
As warm air rises, it expands and cools. The rising air soon reaches the dew point, the temperature at which the water vapor in the air condenses into droplets of water or form tiny ice crystals. Clouds form. If there is a lot of water vapor in the warm air, heavy rain or snow may fall.
cirrus clouds