Trevor Ng
Golf ball-sized hail can cause significant damage to property, including shattering car windows and damaging roofs and siding. These hailstones are formed when tiny crystals of ice are swept into a thunderstorm's updraft and collide with supercooled water, which then freezes around each embryo, causing it to grow. The size of the hailstone is directly proportional to the strength of the updraft fueling the storm. Climate change may also be contributing to the increase in larger hailstones, as the warming atmosphere moves the freezing level higher, causing smaller hail to melt before reaching the ground, while larger hail falls faster and is less affected by higher freezing levels.
| Characteristics | Values |
|---|---|
| Formation | Hail begins as tiny crystals of ice that are swept into a thunderstorm's updraft. |
| Growth | As these ice embryos collide with supercooled water, the water freezes around each embryo, causing it to grow. |
| Conditions | Warmer, humid air supplies more energy to thunderstorms and makes supercooled water more plentiful. |
| Instability | Unstable air masses, originating over higher terrain, move eastward and are more likely to form as the Sun heats up the land faster. |
| Climate Change Impact | Climate change may lead to less small hail and more large hail as the higher freezing levels allow smaller hail to melt before reaching the ground. |
| Terminal Velocity | The speed at which hail falls depends on size, drag coefficient, wind motion, collisions with raindrops or hailstones, and melting as it falls through a warmer atmosphere. |
| Damage | Hail larger than 2 cm (0.79 in) is usually considered large enough to cause damage to property and vehicles and can even be deadly. |
| Largest Hailstone | The largest hailstone recovered in the United States fell in Vivian, South Dakota, on June 23, 2010, with a diameter of 8 inches and a circumference of 18.62 inches. |
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What You'll Learn
- The ingredients for large hail have become more common in parts of the US
- Climate change may lead to less small hail and more large hail
- Hail begins as tiny ice crystals swept into a thunderstorm updraft
- Warm, humid air supplies more energy to thunderstorms
- The larger the hailstone, the stronger the updraft fuelling the storm
The ingredients for large hail have become more common in parts of the US
Hail forms when tiny crystals of ice are swept into a thunderstorm's updraft. As these ice embryos collide with supercooled water, the water freezes around each embryo, causing it to grow. The ingredients for large hail have become more common in parts of the US. This is due to a combination of factors, including an increase in warm, humid air as the Earth warms, which supplies more energy to thunderstorms and makes supercooled water more plentiful. There have also been more unstable air masses, originating over the higher terrain of western North America, that then move eastward. This is similar to turning up a kitchen stove, which then heats up the atmosphere above.
The largest hail tends to form in "supercell" thunderstorms, which have strong updrafts that can keep hailstones suspended for 10-15 minutes or more, providing ample time for them to grow in size. These supercells also have abundant supercooled water, which is essential for hail to grow to larger sizes. The combination of these factors suggests that the atmospheric ingredients for producing very large hail have become more common in certain regions of the US.
NIU scientists used supercomputer-powered simulations to study future hail-producing storms under different greenhouse gas concentration trajectories. Their results indicated that golf ball-size hail or larger will become more prevalent due to increased atmospheric instability, leading to stronger thunderstorm updrafts. The study projected an increase in the largest hailstones by 15% to 75%, depending on greenhouse gas emissions. This increase in atmospheric instability is driven by rising temperatures, which lead to higher water vapor content in the atmosphere, providing more energy for thunderstorms and creating stronger updrafts.
In addition to the formation of larger hailstones, the character of hailstorms themselves may also be changing. There is a potential for more severe thunderstorms with larger hailstones falling over wider areas. As a result, the risk of hail disasters is expected to increase, particularly as populations grow and spread across these regions. The combination of these factors highlights the growing concern over the impact of climate change on the frequency and severity of hailstorms in the US.
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Climate change may lead to less small hail and more large hail
Golf ball-sized hail is destructive and can cause severe damage to property and severe injury or even death to people and animals. Climate change may lead to less small hail and more large hail.
As the Earth warms, there is an increase in warm, humid air, which supplies more energy to thunderstorms and makes supercooled water more plentiful. This provides more energy for hail to grow. The freezing level moves up higher in the atmosphere as the atmosphere warms, allowing small hail to melt completely before reaching the ground.
Larger hailstones, on the other hand, fall faster and require more time to melt, so they are less affected by higher freezing levels. The increase in warm, moist air can also make the air masses that fuel severe weather more unstable, favoring the growth of thunderstorms and large hail.
The impact of hail on insured losses in the U.S. is significant, with an average of $8-14 billion per year, outpacing losses from tornadoes and other severe weather events. Climate-model projections indicate that the trend of increasing hail size may continue in hail-prone areas.
While the overall understanding of hail formation and the specific impacts of climate change are still evolving, the available evidence suggests that climate change may contribute to a decrease in small hail and an increase in larger, more destructive hailstones.
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Hail begins as tiny ice crystals swept into a thunderstorm updraft
Hail is formed when tiny ice crystals are swept into a thunderstorm updraft. As these ice crystals are carried upwards, they collide with supercooled water droplets—liquid water that has a temperature below freezing. The supercooled water instantly freezes around the ice crystal, causing it to grow in size. This process repeats as the ice crystals continue to be lifted higher by the strong updrafts within the thunderstorm. The larger the hailstone becomes, the stronger the updraft required to sustain its ascent.
The formation of golf ball-sized hail requires a particularly intense thunderstorm with powerful updrafts. These updrafts are fuelled by warm, humid air, which supplies more energy to the storm. Climate change has contributed to an increase in warm, humid air, providing favourable conditions for the development of larger hail. As a result, the atmospheric ingredients necessary for producing very large hail have become more common in certain regions, such as the central and eastern United States.
The size of hailstones can vary within a single hailstorm, with a mixture of different-sized hail falling simultaneously. While smaller hailstones can be blown away from the updraft by horizontal winds, larger hailstones typically fall closer to the area of strong updraft. The fall speed of hail depends on several factors, including the size of the hailstone, friction with the surrounding air, local wind conditions, and the degree of melting.
Hailstones often exhibit layers of clear and cloudy ice, which form as the hailstone passes through different temperature and water content conditions within the thunderstorm. These layers are not solely due to vertical movement but also result from horizontal winds within the storm. As hailstones grow in size, they eventually become heavy enough to overcome the strength of the updraft, causing them to fall towards the Earth under the force of gravity.
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Warm, humid air supplies more energy to thunderstorms
Hail is formed when tiny crystals of ice are swept into a thunderstorm's updraft. As these ice embryos collide with supercooled water (liquid water with a temperature below freezing), the supercooled water freezes around the embryo, causing it to grow. The size of hailstones varies, with most hailstorms consisting of a mix of different-sized hailstones.
The Earth's warming climate has resulted in an increase in warm, humid air, which supplies more energy to thunderstorms. This increase in warm, humid air also makes supercooled water more plentiful in thunderstorms, providing more opportunities for hail to grow. Warm, humid air is not the only factor contributing to the increased energy of thunderstorms. The disappearance of snowpack earlier in the year creates conditions that are more favourable for the formation of unstable air masses. As the Sun heats up the land faster, the atmosphere above is also heated up, similar to how a stove heats up the air above it. These unstable air masses then move eastward, contributing to the intensity of thunderstorms.
The severity of a thunderstorm can be determined by the diameter of the hailstones it produces. Larger hailstones indicate a stronger updraft fuelling the storm. The updraft in a thunderstorm carries the hailstones to high altitudes, where the temperature is below -40°F. At these extremely low temperatures, any liquid water present will freeze, allowing hailstones to grow to larger sizes. However, for hailstones to grow to the size of a golf ball or larger, specific atmospheric conditions are required.
The formation of golf ball-sized hail or larger is more likely to occur in certain regions, such as "Hail Alley," an area where Nebraska, Colorado, and Wyoming meet. These states experience an average of seven to nine hail days per year. Other parts of the world prone to damaging hailstorms include China, Russia, India, and northern Italy. While Florida experiences the most thunderstorms, the unique combination of atmospheric ingredients needed to produce very large hail has become more common in parts of central and eastern US.
The increase in hail damage over the past few decades has been attributed to growing populations in hail-prone areas, resulting in more property susceptible to damage. Additionally, the increasing costs of repairing or replacing property damaged by hail have contributed to the rise in insured losses from severe weather events.
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The larger the hailstone, the stronger the updraft fuelling the storm
The formation of golf ball-sized hail is a fascinating yet destructive weather phenomenon. Hail forms when tiny crystals of ice are swept into a thunderstorm's updraft. As these ice embryos collide with supercooled water, the water freezes around each embryo, causing it to grow. The larger the hailstone, the stronger the updraft fuelling the storm. Meteorologists determine the severity of a hailstorm by the diameter of the hailstones.
The updrafts in thunderstorms provide the ideal conditions for hail to grow. As the ice embryos are carried higher, they continue to collide with supercooled water droplets, increasing in size. The stronger the updraft, the longer the hailstones remain suspended in the thunderstorm, allowing them to grow larger.
The size of hailstones is a critical factor in the damage they can inflict. Hailstones the size of grapefruit have been recorded, capable of shattering car windows and causing structural damage to buildings. As the hailstones grow in size, the potential for property damage and injury to people and animals increases significantly. The kinetic energy of larger hailstones is comparable to that of a major league fastball, posing a severe risk to anyone caught in the open.
The relationship between hailstone size and updraft strength is complex. While stronger updrafts can fuel the growth of larger hailstones, the horizontal winds within the thunderstorm also play a role. Smaller hailstones can be blown away from the updraft by these horizontal winds, causing them to fall at an angle or even sideways. The larger hailstones, due to their increased weight, are less susceptible to being blown horizontally and typically fall closer to the updraft.
The unique shapes of large hailstones are also noteworthy. Their protrusions increase drag, lowering their terminal velocity. While this may be good news for anyone in the path of a hailstorm, it also raises an intriguing possibility. The right combination of lobes could, in theory, form a lifting body, creating an aerodynamic shape that could glide or swoop despite its compact form. Although it is unlikely that gliding hail has ever been observed, the Earth's long history of thunderstorms may have produced some surprisingly aerodynamic hailstones.
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Frequently asked questions
Golf-sized hailstones are formed when ice embryos collide with supercooled water, causing the water to freeze around the embryo, which then grows. This happens inside strong thunderstorm updrafts, where raindrops are carried upwards into extremely cold parts of the atmosphere, causing them to freeze into hailstones.
Large hailstone formation is influenced by several factors, including an increase in warm and humid air, which supplies more energy to thunderstorms and makes supercooled water more abundant. Additionally, unstable air masses originating from higher terrain can contribute to the formation of large hailstones as they move eastward.
Golf-sized hailstones can cause significant damage to property, including roofs, siding, windows, and cars. They can also be deadly to people and animals. When a hailstone reaches baseball size, it can shatter windshields and cause severe injuries or fatalities.
