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Prime Minister Mark Carney urged Canadians to remain united in a Canada Day speech in the nation’s capital on Wednesday, but his plan to deliver similar remarks in Edmonton later in the day was upended by thunderstorms that prevented his plane from taking off on time.

Canadians gathered across the country to mark 159 years of Confederation, as the country grapples with a changing world and emerging separatist movements.

In Ottawa, Carney said the country was formed on partnership and accommodation, rather than assimilation and domination.

He spoke to thousands gathered a short drive from Parliament Hill, just moments before a prolonged storm cancelled official events including the evening fireworks.

Carney said Canadians have stood strong and unflinching in the face of global challenges, “working together, resolutely, to build our future. Because in a crisis, fortune favours the bold.”

“The founding idea of Canada is simple: unity does not require uniformity,” he said in French.

WATCH | High heat, torrential rain curtail Canada Day in Ottawa:

Unity on display for Canada Day — until the rain came

Prime Minister Mark Carney and others delivered messages of unity at Ottawa’s Canada Day celebration, until a severe storm shut the event down, cancelling the evening’s concert, fireworks and Carney’s planned trip to Edmonton.

Flights cancelled out of Ottawa

In Quebec, a separation movement has been re-emerging ahead of the province’s October election.

Carney was scheduled to deliver a speech at Canada Day celebration in Edmonton Wednesday evening. It was to have been a rare Alberta appearance for a prime minister on Canada Day, and comes as Albertans are set to vote this fall on whether to remain in Canada, or hold a binding referendum on separation.

His spokesperson said weather conditions in Ottawa prevented his plane from taking off, and he would not make it to Edmonton on time to deliver his speech there.

More than a dozen flights out of the Ottawa airport were cancelled due to the weather.

A screen reads Seek Shelter above people standing behind barricadesA seek shelter warning is seen on Parliament Hill during Canada Day festivities Wednesday afternoon. (Keito Newman/The Canadian Press)

Evening events, fireworks cancelled in Ottawa

Thunderstorms rolled through Ottawa most of Wednesday afternoon, bringing strong winds, extremely heavy rain, lightning and threats of hail. The rest of the day and evening’s events were cancelled, including the fireworks presentation.

The prime minister began the day’s celebrations on Wednesday serving pancakes in his own riding in the Ottawa suburbs.

Conservative Leader Pierre Poilievre took part in Canada Day events in Alberta, and posted on social media that he was among those “proudly celebrating our country’s 159th birthday with the western spirit of hard work, freedom, family, and community.”

Carney’s speech in Ottawa also paid homage to Jeremy Hansen, the only Canadian to make the historic trip around the dark side of the moon earlier this year aboard NASA’s Artemis II mission.

Man in sunglasses and a blue utility suit speaks with an arm raised and a silhouette of the moon behind himCanadian Space Agency Astronaut Jeremy Hansen pumps his fist as he delivers remarks at the Canada Day National ceremony. (Justin Tang/The Canadian Press)

Hansen took the stage after Carney, greeting a crowd of several thousand people at the day’s main festivities, held in a field at LeBreton Flats Park due to construction on Parliament Hill.

He spoke about the teamwork of the Artemis crew during the lunar mission, and said he was proud to wear a Canadian mission patch during the journey.

“When I look out at all of you, I see the same: A country powerful, together as one — like a crew — through shared sacrifice, mutual reliance and a commitment to a collective vision much larger than any single one of us,” Hansen said.

Carney and other dignitaries wore portable fans around their necks during the noon ceremony as the mercury soared.

Shortly after things wrapped up on the main stage and the weather worsened, some attendees ran for cover to the nearby War Museum.

Environment Canada issued a severe thunderstorm warning, and cautioned that the weather could bring hail and flash flooding.