In a city renowned for its striking proximity to both prairies and mountains, Calgary finds itself at the centre of a significant research initiative aimed at understanding the dynamics of hailstorms. With over 1.6 million residents, the city’s unique geographical features create ideal conditions for these intense weather phenomena. The Northern Hail Project, spearheaded by Julian Brimelow at the Canadian Severe Storms Laboratory in London, Ontario, is making strides in this field, contributing crucial insights into how hailstorms form and how communities can better prepare for them.
The Science Behind Hailstorms
Calgary is often dubbed the “hailstorm capital of Canada,” situated within a region colloquially known as “hailstorm alley.” This area extends from High River to Rocky Mountain House, encompassing the locations that experience the most damaging hailstorms in the country. On August 5, 2024, a particularly devastating storm inflicted over $2.8 billion in damages, marking it as the second most expensive natural disaster in Canadian history.
Brimelow describes the role of the nearby mountains in the formation of hail. “The mountains facilitate the lifting of moist air, which fuels the updrafts in thunderstorms. Coupled with wind shear, these conditions can lead to the organisation of hailstorms,” he explains. This interplay of geography and meteorology makes Calgary an ideal venue for studying these powerful storms.
Innovative Research Techniques
Recently, the Northern Hail Project team engaged the public at Telus Spark in Calgary, aiming to demystify the science of hailstorms. They showcased an array of specialised equipment, including a hail intercept vehicle known as Hail Swath, designed to chase storms and collect data on hail size and impact.
“This year marks our fifth year in Alberta. Previously, we would collect hail samples after storms had passed, which proved challenging due to lightning and rain,” Brimelow noted. The team has shifted their approach, now seeking to position their equipment ahead of incoming storms to enhance data collection.
New tools for this research include portable weather stations, high-speed cameras, and hail catchers that rapidly freeze samples for analysis. “While there are limited hail sensors globally, we’ve acquired the four most effective types, each with its own strengths and weaknesses,” Brimelow stated.
Understanding Hail’s Impact
The research aims not only to improve understanding of hailstorm dynamics but also to enhance future weather warnings. Brimelow highlights a significant challenge: “Current weather radar can reliably detect the presence of hail, but distinguishing between sizes and amounts remains complex.”
This season, the team has conducted damage assessments on approximately 35 storms, gathering critical data on what withstands hail impact and what does not. “Our findings show that wind-driven hail poses a significant risk. When large hail, such as that the size of walnuts or golf balls, interacts with strong winds, the potential for destruction increases dramatically,” he explained.
The information gathered through this research is expected to inform the development of more resilient building materials, thereby safeguarding Calgary and surrounding communities against future hailstorm devastation.
Why it Matters
As climate change continues to alter weather patterns, understanding the mechanics of hailstorms is increasingly vital. Research initiatives like the Northern Hail Project not only enhance scientific knowledge but also empower communities to prepare and adapt. The insights gained could lead to innovations that protect property and lives, ultimately contributing to a more resilient society in the face of increasingly severe weather events.
