With the Okanagan香蕉视频直播檚 warming winters due to climate change, the thought of cars driving across Okanagan Lake seems like a fantasy.

But one Kelowna historian remembers it happening during a cold winter in his youth.

Bob Hayes, president of the Okanagan Historical Society, said he was in his teens in 1968, which was the year he remembers a portion of the lake freezing thick enough, from Kelowna to West Kelowna, for vehicles to drive across.

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Nowadays, cars on the lake can only be seen in old photographs. Before the lake香蕉视频直播檚 floating bridge was finished in 1958, ice-breaking tugs were used to clear paths for a ferry.

香蕉视频直播淚 taught for almost 30 years across the lake, and I drove the bridge many times. And I don香蕉视频直播檛 remember in my teaching career, from 1980 to 2010 seeing vehicles then,香蕉视频直播� said Hayes.

He remembers even less ice now than in the 1980s, and recalled that the bay would freeze in West Kelowna near the bridge. His cousin who has lived in the area for 85 years, maintains the lake would freeze every seven years in the 1900s.

UBCO biology professor Ian Walker agreed the lake would freeze more frequently in the past. 香蕉视频直播淚n the early part of the previous century, back around the 1910s, 1920s, it used to freeze over more regularly than it does now,香蕉视频直播� he said.

In the last 50 years, there were times when the lake came close to freezing over, but it was never complete, said Walker. 香蕉视频直播淐ertainly you don香蕉视频直播檛 see photographs of people skating on the lake or anything of that sort in recent years.香蕉视频直播�

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Various automobile races took place on the lakes in Lake Country mainly in the 1980s and 1990s said retired racer, Richard Gibbons.

He recalled in 1985 that the ice was 15 to 16 inches thick on Duck Lake during a particularly cold winter. The following year had about six inches of ice.

The races eventually stopped due to a combination of unreliable ice and the urbanization of the district, he said.

Denise Neilsen, a research scientist at the science and technology branch of Agriculture and Agri-Food Canada, has been researching climate change for the past 15 years.

Neilsen collected data from Summerland香蕉视频直播檚 weather station, which showed an increase in both maximum and minimum temperatures in the winter months.

A previous story by the Capital News in 2004, said temperatures in the Okanagan had increased by one per cent.

Her latest data, dated from 1916 to 2016, shows winter temperatures have increased 1.6 C during that time. Erratic weather patterns are also more common in recent years.

香蕉视频直播淭hat seems to have been sufficient to have resulted in a reduction in the frequency of the lake freezing over. So 1 C doesn香蕉视频直播檛 sound like much, but it香蕉视频直播檚 enough to make that difference,香蕉视频直播� said Walker.

香蕉视频直播淭he consensus out there is that it seems to be human-caused. There may be some small part of it that may be due to some urban heat island effect or something of that sort, but that would be a pretty minor component.香蕉视频直播�

For rare weather events, it香蕉视频直播檚 harder to attribute them to climate change, but 香蕉视频直播渋t香蕉视频直播檚 fairly telling that we haven香蕉视频直播檛 had any serious cold hardiness issues because we haven香蕉视频直播檛 had a lot of instances of temperatures less than -20 C midwinter since the early 1990s,香蕉视频直播� said Neilson.

香蕉视频直播淪imilarly, we香蕉视频直播檙e also having an increase in the number of days where we have over 35 C which is detrimental to crops, so there are things happening at both ends of the spectrum.香蕉视频直播�

A number of factors must occur in order to freeze Okanagan Lake.

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香蕉视频直播淭he combination of events (to create ice) is having cold temperatures, stillness and then a snowfall that falls directly on the lake and that then starts coalescing the ice crystal formation on the lake,香蕉视频直播� said Neilson.

Brian Symonds is a retired director of water stewardship for the province and agrees that there has to be a mix of long cold temperatures for ice to form.

Warmer summer temperatures also affect the lake.

香蕉视频直播淗ow much it warms in the summer depends on how hot the summer is too, and the warmer the lake is the longer it takes to cool down,香蕉视频直播� said Symonds.

The weather also has to be calm for ice to form, as churning waters mix warmer and colder water.

香蕉视频直播淚t takes that mixing to churn up that top layer to mix with the bottom layer too. It香蕉视频直播檚 not as simple as a pond,香蕉视频直播� he said. Snowmelt also has an impact on the lake香蕉视频直播檚 temperature.

Since 1990, he has seen years with more or less ice. Shore ice formed last year in a number of areas, he said.

But after 50 years, the thought of Okanagan Lake香蕉视频直播檚 frozen surface, reaching from Kelowna to West Kelowna, remains a distant memory.

To report a typo, email: edit@kelownacapnews.com.

carli.berry@kelownacapnews.com
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