Snow squall

A snow squall is a fast snow storm.

It brings very strong winds. The snow can blow so much that you cannot see. This is called a whiteout.

Sometimes, cold air moves over warm water. This makes heavy snow showers.

These storms can happen near large lakes.

Other squalls move in lines. They can pass by very quickly. They may only last 30 minutes.

These storms are very dangerous. They make roads slippery and hard to see.

This can cause car crashes.

Some big storms even make thunder and lightning. This is called thundersnow. It is a very wild kind of weather.

A snow squall is a sudden, heavy snow storm.

It brings strong winds and blowing snow. This can cause a whiteout. A whiteout is when you cannot see clearly.

There are two main types of snow squalls. The first type is lake-effect snow. This happens when cold air moves over warm water. The air picks up moisture. This makes heavy snow showers. These storms often hit narrow paths called snowbelts. Some squalls even make thundersnow. This is snow with lightning and thunder.

The second type is a frontal snow squall. This happens along a line of moving air. These squalls are very fast. They may last less than 30 minutes.

Snow squalls are very dangerous. They make roads slippery very quickly. They also make it hard to see.

This can cause many car crashes. In 2015, a squall caused a huge pile-up in Michigan. Some very strong squalls can even make tornadoes.

A snow squall is a sudden and heavy snow storm.

These storms bring strong winds and blowing snow. They often create whiteout conditions. A whiteout is when you cannot see clearly because of the snow. These events are similar to blizzards. However, they happen in a small area or for a short time. They can be very dangerous for travelers.

There are two main ways these storms work. The first way is called lake-effect snow. This happens when very cold air moves over warm, open water. The air picks up moisture from the water. This creates clouds that produce heavy snow showers. These showers often hit narrow paths called snowbelts.

Sometimes, the air is so cold that it creates thundersnow. This is snow that comes with lightning and thunder.

The second way is through a frontal snow squall. This type happens along a line of moving air. It is similar to a line of summer thunderstorms. The clouds are much lower, so they are hard to see on radar. These squalls usually last less than 30 minutes in one spot. But the line can move across a very large distance. They can form near a cold front. They might even come in two or three quick bands.

Scientists look for specific things to predict these storms. They look for a sharp change in the wind. They also look for a low-level jet of air. For lake-effect snow, the water and air must have a temperature difference. The water must be unfrozen and the surface temperature should be near freezing. The wind path over the lake must be at least 100 kilometers. These facts help people prepare for the heavy snow.

Snow squalls can cause big problems on roads. The weather changes so fast that drivers may not be ready. This can lead to many car accidents. For example, a squall hit Michigan on January 9, 2015. It caused a huge pile-up with 193 vehicles on I-94.

Some very powerful squalls can even form tornadoes. They are much more sudden than a normal snowstorm.

A snow squall is a sudden weather event. It brings moderately heavy snowfall and strong, gusty winds. These winds blow the snow around. This often creates whiteout conditions. A whiteout is when visibility is very low. You might not be able to see the road or nearby objects. Snow squalls are similar to blizzards. However, they are different in two ways. They are localized in time or location. They may also have different amounts of snow accumulation.

There are two primary types of snow squalls. These are known as lake-effect snow and frontal snow squalls. Both types can reduce visibility significantly. They can also produce very heavy snow. Lake-effect snow occurs when arctic air moves over warm water. This happens during the winter months. The air moves over large expanses of open water. This process creates convective clouds. These clouds cause heavy snow showers because of the moisture.

To form lake-effect snow, specific conditions must be met. The temperature difference between the water and air is important. The surface temperature should be near the freezing mark. The lake must remain unfrozen. The path over the lake must be at least 100 kilometers long. Additionally, the directional wind shear with height should be small. This means the wind direction changes by less than 30 degrees from the surface to higher levels. These storms create narrow snow bands. These bands can produce many inches of snow per hour. The areas affected are called snowbelts.

Frontal snow squalls work differently. A frontal snow squall is an intense convective line. It is similar to a summer squall line. This happens when the temperature is near freezing at the surface. Strong convection develops in the air. This convection provides enough moisture for whiteout conditions. The wind causes intense blowing snow as the line passes. These squalls usually last less than 30 minutes at any single point. However, the moving line can travel over very large distances.

Forecasters look for specific signs to predict frontal squalls. They look for a sharp frontal trough. They also look for a wind shift. They watch for a low-level jet of more than 30 knots. The cold dome behind the trough must be at the 850-millibar level. It must also be at least 10 degrees Celsius colder than the air below it. Surface moisture also helps. Moisture from water or liquid precipitation raises the dew point. This helps saturate the boundary layer. This saturation increases convective available potential energy. This leads to deeper vertical growth in the clouds.

Both types of squalls can lead to thundersnow. Thundersnow is snow accompanied by lightning and thunder. This happens when there is large vertical growth and mixing. This can occur in lake-effect snow or frontal squalls. These storms are very dangerous for travelers. They affect motorists and airplanes. The change in weather is very sudden. Slippery roads and sudden whiteouts cause many accidents. In some cases, squalls can even become supercells. These powerful storms can form tornadoes.

History shows how dangerous these events can be. On January 9, 2015, a heavy snow squall hit Michigan. It occurred on the I-94 highway near Galesburg. The localized storm caused a massive pile-up. In this single event, 193 vehicles collided. This shows how quickly heavy snow can accumulate. It can also paralyze entire cities. Because they are so sudden, they are often more dangerous than blizzards.