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A powerful storm is bearing down on the West Coast and bringing with it a scary-sounding weather term – bomb cyclone.

Bomb cyclone is a term used by weather enthusiasts to describe a process that meteorologists usually call bombogenesis. It’s the rapid intensification of a cyclone in a short period of time, and it can happen during powerful storms such as the one northern California and the Pacific Northwest are preparing for this week.

But what is a bomb cyclone, why does it happen and why are these big storms so feared?

What is a bomb cyclone?

A bomb cyclone occurs during the rapid intensification of a cyclone located between the tropics and the polar regions, according to the National Oceanic and Atmospheric Administration. It can happen when a cold air mass collides with a warm air mass, which is something that can occur over ocean waters, the agency says.

The measurement needed to determine whether a cyclone can be classified a bomb cyclone can be tricky, but it largely concerns a swift drop in pressure. Atmospheric pressure is measured in millibars by the National Weather Service. If a storm decreases 24 millibars or more in 24 hours or less, it can be considered a bomb cyclone, said Stephen Baron, a forecaster with the weather service in Gray, Maine.

“I would say rapid intensification of hurricanes is one of the more common times we see it,” Baron said. “We do see it with Nor’easters occasionally.”

Why is it happening on the West Coast?

The National Weather Service Weather Prediction Center has issued excessive rainfall risks starting Tuesday and running through Friday because of the powerful storm expected in northern California and the Pacific Northwest. The storm is arriving as the region experiences an atmospheric river, which is a long plume of moisture, over the Pacific Ocean.

The Weather Prediction Center said the storm intensified swiftly enough that it’s considered a bomb cyclone.

Bomb cyclones can happen in many places, and aren’t unique to the West Coast. They can occur in several parts of the world’s oceans, including the Northwest Pacific and North Atlantic.

What conditions could it bring?

This storm is expected to bring severe rainfall. That could lead to flash flooding as well as winter storms in different parts of the West Coast depending on elevation.

High wind watches are also expected in some parts of the West Coast.

Travel is expected to be hazardous, and power outages are expected. There could also be significant damages to trees and infrastructure.

When else has it happened?

Bomb cyclones have been associated with major weather events all over the country in recent years. Hurricane Milton, which made landfall in Florida last month as a Category 3 hurricane, was a recent example of a bomb cyclone, Baron said.

A bomb cyclone in 2018, which helped popularize the term on social media, brought snow to the Southeast and winds that were close to hurricane force. Another in 2022 brought extreme weather and bitter cold to much of the country.

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WINNIPEG – Police in Winnipeg say a suspect is on the loose following a report of a man armed with a large knife at the University of Manitoba.

Officers were called around 6:30 a.m. to the university’s Fort Garry campus for a report of a man dressed in black carrying a large knife into the Allen Building, which houses the physics department.

Police and university officials had asked people to stay away from the area, and students already on campus were told to lock all doors and stay put.

Investigators say a suspect has not been found and officers remain on campus as a precaution.

In-person classes, exams and events were cancelled for the day.

Virtual classes and those on the Bannatyne campus were going ahead.

Last month, police said a man broke into a dorm room at the university and sexually assaulted a woman. A 46-year-old man was arrested and faces various charges.

Officers at a news conference Tuesday said that alleged assault did not influence how they responded to the knife report.

“This is an isolated incident that’s looked at for what it is, based on information we received. We don’t base that on prior incidents or to be careful. It has to do with this incident and how serious of a nature it was,” said police spokesman Const. Claude Chancy said.

This report by The Canadian Press was first published on Nov. 19, 2024.

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TORONTO – A northern Ontario First Nation has declared a state of emergency over concurrent crises involving crime, gang activity, addiction and mental health problems that have plagued the community for years.

Netmizaaggamig Nishnaabeg Chief Louis Kwissiwa is calling for policing and mental health help from the province and the federal government.

Kwissiwa says the community needs more police officers for a start, as well as professional help for the increasing number of people addicted to drugs.

He says addictions, violence, trauma and suicides are increasing.

There are just five police officers in the region, but they are a 45-minute drive away.

The solicitor general says he has spoken to the chief of Anishinabek Police Services about the seriousness of the issue.

This report by The Canadian Press was first published Nov. 19, 2024.

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