Describe the weather along a cold front where very war, moist air is being displaced.?

Question

Can someone help me please ??? :(

Answer 1

Warm air rises and holds more water vapor.

When a cold front collides with a warm region rain is the most likely result, clouds will form; especially thunderclouds (which can generate tornados).  When a cold front arrives there is a significant change in air pressure, if the air pressure falls (cold air is heavier than warm air) then a storm is possible.

Clouds are formed as air borne water droplets collect around dust particles.  As the volume of water vapor in the air rises then the chance of cloud formation also increases.  If a cloud forms and becomes a thundercloud then it can grow into a towering mighty engine of weather rising thousands of feet into the air and coming only within a few hundred feet from the ground.  Inside such clouds there is a lot of air movement, cloud formation, and falling water vapor.

As the cold air comes in it displaces the warm air causing it to rise even more; then the warm air cools quickly, and when it does that it has to lose the water vapor it holds because cold air holds less water vapor.  This is why rain is common at the collision of a cold front and warm air.

There is also a lot of air circulation the warm air rising and the cooling and dropping with more cold air coming in hitting warm air and rising which creates a circular motion.  If that motion becomes perpendicular to the ground then a funnel cloud and a tornado will form.

Thunderclouds are huge towering clouds with a lot of change going on inside of them.  At the top the air cools quickly, the water vapor falls out as rain and quickly freezes into sleet or snow.  Before it reaches the ground it can be reabsorbed or warmed enough to fall as rain.  An especially violent storm often is preceded by hail because the air circulation slams the frozen water down before it has a chance to thaw and melt.

There is nothing confining the air so if there is a slight instability, with slightly warmer air forcing the vertical movement to tip over, then the vertically rotating movement can flip over on its side and become a horizontal movement; this breeds tornados.

According to Wikipedia:  http://en.wikipedia.org/wiki/Thunderclou...

“Cumulonimbus (Cb) is a type of cloud that is tall, dense, and involved in thunderstorms and other intense weather. The clouds can form alone, in clusters, or along a cold front in a squall line. Cumulonimbus clouds form from cumulus clouds (namely from cumulus congestus) and can further develop to a supercell, a severe thunderstorm with special features.

Cumulonimbus clouds usually form from cumulus clouds at a much lower height, thus making them, like cumulus clouds, grow vertically instead of horizontally, thus giving the cumulonimbus its mushroom shape. The base of a cumulonimbus can be several miles across, and it can be tall enough to occupy middle as well as low altitudes; though formed at an altitude of about 3,000 to 4,000 meters (10,000 to 12,000 feet), its peak can reach up to 23,000 meters (75,000 feet) in extreme cases. Typically, it peaks at a much lower height (usually up to 5,000 meters / 16,500 feet).

Well-developed cumulonimbus clouds are also characterized by a flat, anvil-like top (anvil dome), caused by straight line winds at the higher altitudes which shear off the top of the cloud, as well as by an inversion over the thunderstorm caused by rising temperatures above the tropopause. This anvil shape can precede the main cloud structure for many miles, causing anvil lightning.

Cumulonimbus clouds = heavy rain and thunderstorms.

According to Wikipedia:  http://en.wikipedia.org/wiki/Cold_front

“A cold front defined as the leading edge of a cooler and drier mass of air. The air with greater density wedges under the less dense warmer air, lifting it, which can cause the formation of a narrow line of showers and thunderstorms when enough moisture is present. This upward motion causes lowered pressure along the cold front. On weather maps, the surface position of the cold front is marked with the symbol of a blue line of triangles/spikes (pips) pointing in the direction of travel. A cold front's location is at the leading edge of the temperature drop off, which in an isotherm analysis would show up as the leading edge of the isotherm gradient, and it normally lies within a sharp surface trough. Cold fronts can move up to twice as fast and produce sharper changes in weather than warm fronts. Since cold air is denser than warm air it rapidly replaces the warm air preceding the boundary. Cold fronts are usually associated with an area of low pressure, and sometimes, a warm front.

A cold front commonly brings a narrow band of precipitation that follows along the leading edge of the cold front. These bands of precipitation are often very strong in nature, and especially in the Spring and Summer months, can bring severe thunderstorms and or tornadoes. In the spring, these cold fronts can be very strong, and can bring strong winds when the pressure gradient is tighter than normal. In the summer, cold fronts can cause severe thunderstorms and hailstorms, but in the winter, cold fronts sometimes come through an area with little or no precipitation, and with little or no effect on temperature. In the autumn months, cold fronts rarely bring severe thunderstorms, but are known for bringing heavy, and widespread rainstorms. These rainstorms sometimes bring flooding, and can move very slowly because cold fronts are more prone to slow movement in the fall. In the winter, cold fronts can bring severe cold spells, and heavy snowstorms. The cold fronts in the late fall become more polar in nature, and tend to bring very cold weather, and temperature drops up to 30°F.