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Types of Weather
Transcript of Types of Weather
Thunderstorms are produced by cumulonimbus clouds. There needs to be moisture, warm unstable air and lift (fronts, sea breezes) in order for a thunderstorm to occur.
Hail form when thunderstorm updrafts are strong enough to water droplets well above the freezing level. This freezing process forms a hailstone, which falls from the sky as precipitation.
Cold air below freezing is needed to make snow. Then moisture and warm, rising air is needed to form clouds and precipitation. When enough snow falls rapidly and violently, it forms a blizzard.
A waterspout is a column of rotating, cloud-filled wind. A waterspout descends from a cumulus cloud to an ocean or a lake. The water inside a waterspout is formed by condensation in the cloud.
Freezing Rain happens when precipitation falls in liquid form as raindrops and immediately freezes as it hits most any surface. This can happen when the temperature is very low.
The erosion of soil in one area and deposition of it in another is what causes dust storms. When dry, warm winds blow across the soil, it is carried away and collects in a dust storm.
Hurricanes form over warm water and are fueled by evaporation from sea water. The atmosphere must cool off very quickly in order for one to form. Winds flow outward above the storm allowing the air below to rise.
Snow is formed when temperatures are low and there is moisture - in the form of tiny ice crystals - in the atmosphere. When these tiny ice crystals collide they stick together in clouds to become snowflakes. If enough ice crystals stick together, they'll become heavy enough to fall to the ground.
Types of Weather
Most tornadoes form from thunderstorms. You need warm, moist air from the Gulf of Mexico and cool, dry air from Canada. A change in wind direction and an increase in wind speed with increasing height creates an invisible, horizontal spinning effect in the lower atmosphere.
Fog forms when cool air passes over a warm body of water or moist land. In general we see that fog is formed whenever there is a temperature difference between the ground and the air. When the humidity is high enough and there is enough moisture, we see fog.