A cold front is caused by the boundary between warm and cold air, with the cold air mass taking the place of the warm air mass. Cold fronts can occur in the winter and in the summer.Know More
Since the cold air mass is heavier, it pushes underneath the warm air mass as the cold front moves. The warm air rises because it is lighter, and the presence of enough humidity in the air can create water vapor and precipitation. Cold fronts can cause thunderstorms, especially in the summer when there is more humidity in the air. The barometric pressure decreases and then increases, and the temperature can drop more than 15 degrees in one hour after the arrival of a cold front.
On a weather map, cold fronts are usually designated by a curved line with arrows pointing in the direction in which the front is moving. The air behind a cold front is drier and colder than the air in front of it. Before a cold front arrives, the wind moves in a south-southwest direction, the temperature increases and the dew point stays steadily high. After the cold front passes, the wind moves in a west-northwest direction, the temperature drops slowly and the dew point begins to lower again.Learn More
Strong winds are most often caused by air moving from an area of high atmospheric pressure to an area of low pressure quickly over a small distance. This is called a strong pressure gradient force.Full Answer >
The trade winds are caused by a combination of convection air currents and the Earth's rotation. Air is warmed near the Equator and moves towards each pole, respectively. This air is deflected by the Coriolis effect, or the spin of the Earth, causing it to fall back towards the Equator in both hemispheres.Full Answer >
The first signs of an approaching warm front include a general movement of air from southwest to northeast, a drop in air pressure, and warmer air found behind the movement of the front. Warm fronts tend to signal a general change in weather.Full Answer >
A front is a boundary between air masses that leads to a low pressure system as the atmosphere attempts to even out the temperature contrast. If there is enough moisture in the air, the uplift as these two air masses collide causes rain. If the temperature differential is large enough, the collision leads to thunderstorms, according to NOAA.Full Answer >