Tue. Nov 5th, 2024
Occasional Digest - a story for you

Heavy hailstorms have wreaked havoc across Australia this summer.

But if you’re unlucky enough to have giant hailstones end up in your yard, scientists hope you won’t just take photos to post on social media but will preserve the icy lumps for research.

University of Queensland (UQ) senior research fellow Joshua Soderholm is leading a hail research project and has studied hailstones from Mackay to Melbourne.

Dr Soderholm extracts data found in large hailstones through a 3D scanner to add to a global database, comparing hailstones from across the world.

Hail stone.
Scientists are calling on the public to preserve hailstones for weather research.(Supplied: Christopher Harvey)

So, why does this matter?

In short, the research can help to improve weather radar systems.

“For the first time, we can start to improve the estimates we get from weather radar of giant hail, and also the way we model giant hail,” Dr Soderholm said.

A man wearing a jacket and beannie smiles as he stands in front of a freezer and holds a large hailstone.

Joshua Soderholm is part of a global network of hail scientists.(Supplied: Joshua Soderholm)

The research shows hailstones have rings, like trees, which represent a life cycle.

The hailstone’s life cycle can then be compared to the weather radar to see how accurate the predictions were.

This can be used for future warnings to predict the size and scale of a hailstorm more precisely.

A cross section of a hailstone showing rings like in a tree.

3D imaging of hailstones show they have lifecycle rings, similar to trees.(Supplied: Joshua Soderholm)

How do you preserve hailstones?

The simple answer is to place the hailstone in a plastic bag and chuck it in the freezer.

But there are a few more steps in the process.

Thomas Hinterdorfer from Higgins Storm Chasing, an independent weather group, has been working with Dr Soderholm to get hailstones into the laboratory.

A young man stands smiling holding a large hailstone being measured with a ruler, next to another man smiling.

Thomas Hinterdorfer (left) travelled to Nebraska, in the US. in search of giant hailstones.(Supplied: Thomas Hinterdorfer)

These are his tips for getting hailstones from your home to the lab.

First, safety is paramount, so wait until the storm is over before you venture out to hunt for hailstones.

Limit handling of the hailstone because heat from your body temperature will cause it to melt more quickly.

Place a ruler next to the hailstone and if it’s larger than 8 to 10 centimetres, take a photo – you’ve found one the scientists are looking for.

Seal it in a plastic bag to stop any other residual moisture attaching to the hail. This way it can maintain its size.

If you have more than one hailstone, place them in separate bags to stop them from sticking together.

Contact Mr Hinterdorfer through the Higgins Storm Chasing Facebook page and the details and photos will be passed on to the scientists at the University of Queensland.

There are no costs involved, and a team of researchers will collect the hailstone from you.

A large hailstone being held in a person's hand.

Hailstones larger than 8 to 10 centimetres are needed for UQ’s hail research.(Supplied: Thomas Hinterdorfer)

Australia leading global database

Dr Soderholm said his international research showed Australia was one of the top countries to receive large amounts of hail, particularly in Queensland.

“We’re very interested in large-sized hailstones, because there are just so few globally which have been collected,” he said.

“What makes us quite special in Queensland is we get a lot of hail on the coast, not many places in the world are similar in that way.”

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