The formation of snow depends heavily on temperature. Snow from when the atmospheric temperature is at or below freezing, and there is a limited amount of moisture in the air. It can be too warm to snow, but it cannot be too cold to snow. Snow can fall even at incredibly low temperatures as long as there is some source of moisture and some way to lift or cool the air. Snow formation requires moisture, very cold but very dry areas barely receive snow. If snow stays on the ground, the texture, size, and shape of individual grains will change even while the snow temperature remains below freezing, or they may melt and refreeze over time, and will eventually become compressed by following snowfalls. Most snowflakes are less then 1.3 centimeters across. No routine measure of snowflake sizes are taken, so the exact measurement isn't known. The article states "Under certain conditions, usually requiring near-freezing temperatures, light winds, and unstable atmospheric conditions, much larger and irregular flakes can form, almost 5 centimeters across." (nsidc.org) In conclusion, snow depends heavily on the temperature for it to occur.
Clouds are made up of ice crystals that settle on the dust particles in the atmosphere. The droplets are so small - a diameter of about a hundredth of a millimetre - that each cubic metre of air will contain 100 million droplets. Clouds are organized into four basic groups, depending greatly on the height of the clouds' base from ground. High-level clouds, called cirrus clouds, can reach heights of 20,000 feet and are usually thin. They do not produce rain and actually indicate fair weather, and are typically made up of ice. Midlevel clouds form between 6,500 feet and cirrus level. They are referred to as "alto-" clouds and have names such as altostratus or altocumulus, depending on their shape. They indicate an approaching storm. Low-level clouds lie below 6,500 feet. Meteorologists refer to them as stratus clouds. They're often dense, dark, and rainy, or snowy, though they can also be cottony white clumps mixed with blue. The most violent types of clouds are thunderstorms. According to the article "Clouds form when the invisible water vapour in the air condenses into visible water droplets or ice crystals." (Met Office) In conclusion, different clouds can be formed based on the temperature, humidity, and the atmosphere.
Tornadoes are the most powerful, violent, and unpredictable weather system on Earth. Tornadoes occur when there is a change in wind direction and an increase in wind speed. This change occurs at an increasing altitude and makes an invisible horizontal spinning effect in the lower atmosphere. Next, rising air within the thunderstorm’s updraft tilts the rotating air from horizontal to vertical. an area of rotation, 3-10 kilometers wide is contained within a vast majority of the storm. This is where the strongest tornadoes form. Then a lower cloud base in the center of the storm becomes a rotating wall cloud. This area can be nearly rain free. Finally, a tornado develops and starts to wreak its destruction. Many less severe are invisible to the human eye, major tornadoes usually become more visible when the strong winds within the funnel lift up dirt and debris off the Earth’s surface. Tornadoes are typically classified as either a land spout (a tornado on land), a water spout (a tornado that forms over water) or a gustnado (a small tornado caused by a strong downburst of wind from a thunderstorm). The average tornado has maximum wind speeds of about 112 mph or less, measures around 250 feet in width and travels approximately one mile before falling apart. Some of the most chaotic tornadoes in recorded history have had winds of 300 miles an hour, have measured more than 2 miles in size, and have carved devastating paths of destruction miles and miles in length. According to the article, "The National Weather Service (NWS) defines a Tornado as a violently rotating column of air in contact with the earth’s surface (land or water) and commonly associated with a severe thunderstorm." (livescience.com) Based on the evidence above, tornadoes have to have specific events to happen before tornadoes can actually form.
A thunder storm is any interruption in the Earth's atmosphere, with strong winds, usually with snow, rain, or thunder. Thunder storms are usually developed by the same thing process that forms cumulus clouds (the white and puffy ones). They form when a humid air mass near the surface rises on currents of air called updrafts. Another product of the violent up and down drafts in the storm cloud is lighting. Lightning is a huge spark caused by a build up of electrical charges. Thunder storm clouds build up a large concentration of positive charges near the top of a cloud, and negative charges near the middle. These opposite charges result in a high voltage, which in return create thunder. The temperature of a lightning bolt passes 40,000 degrees fahrenheit (hotter than the sun). The air around it is superheated, and causes it to expand and contract rapidly, which causes the loud booming noise. The article states "Thunderstorms develop by the same process that forms cumulus clouds, the puffy clouds of summer skies" (Encyclopedia.com) As you can see, thunderstorms are formed from cumulus clouds and updrafts.