What is a bomb cyclone? Meteorologist explains incoming B.C. storm

Meteorologists issue weather warnings as “bomb cyclone” poised to hit B.C. coast

A rapidly intensifying storm bearing down on British Columbia's coast could bring damaging winds, heavy rain and power outages, Environment Canada warned Tuesday. The storm, fuelled by a stark contrast in atmospheric pressure between a low-pressure system in the Gulf of Alaska and a high-pressure system over B.C.'s Interior, rapidly strengthened as it tracked towards the B.C. coast.

The weather agency said the storm could bring wind gusts of up to 90 kilometres per hour near the water and even stronger gusts at higher elevations in the North Shore mountains. More than 100 millimetres of rain is forecast for some areas on Wednesday, potentially leading to localized flooding and mudslides.

Environment Canada meteorologist Armel Castellan said the storm is expected to impact the South Coast from Greater Victoria up to Powell River. Castellan said the current forecast track shows the storm making landfall around Tofino late Tuesday night or early Wednesday morning, then tracking up the Sunshine Coast before hitting the Lower Mainland by midday Wednesday.

What is a bomb cyclone?

A bomb cyclone is a rapidly intensifying storm that forms when atmospheric pressure drops 24 millibars (a measure of pressure) within 24 hours. This phenomenon, also known as bombogenesis, can create strong winds, heavy rain, and even tornadoes.

Bomb cyclones are most common in the winter months when the temperature difference between the cold air over land and the warm air over the ocean is greatest. As the cold air moves over the warm ocean, it picks up moisture and energy, which can lead to the formation of a storm.

Bomb cyclones can have a significant impact on coastal areas, causing flooding, erosion, and power outages. In some cases, bomb cyclones can even be deadly. In 2017, a bomb cyclone that hit the northeastern United States caused at least 27 deaths and left more than a million people without power.

How to prepare for a bomb cyclone

There are a few things you can do to prepare for a bomb cyclone:

• Stay informed about the weather forecast and be prepared to take action if a storm is expected.
• Secure loose objects around your home and yard, such as patio furniture and garbage cans.
• Stock up on food, water, and other essential supplies in case you lose power.
• If you live in a coastal area, be prepared to evacuate if necessary.

What to expect from the incoming B.C. storm

The incoming B.C. storm is expected to bring strong winds, heavy rain, and possible power outages. Here is what you can expect:

• Wind gusts of up to 90 kilometres per hour near the water and even stronger gusts at higher elevations.
• More than 100 millimetres of rain in some areas, which could lead to localized flooding and mudslides.
• Power outages are possible, especially in areas with high winds.

Environment Canada is urging residents to be prepared for the storm and to take steps to stay safe.