Meteor show. Photo © NASA

Watching the night sky from the western edge of the continent at this latitude at this time of year presents a gamble. Announcements that a full moon would light the way for midnight mass-goers this year overlooked our forecast rain showers and our understandable preference for warm, lit, cosy quarters over damp, dark, blustery venues.

Even on December 21, clouds ruled the night. They blocked views of the annual Ursid meteor shower. If the weather had cooperated, the solar-reflector qualities of the nearly full moon so enjoyed elsewhere would have washed out sightings of falling stars we might otherwise have caught.

Before the Ursids zipped by behind thick cloud cover, we could have tried our night-sky luck with the much more spectacular Geminids. This shower peaked on December 13 and 14. Typically, as many as 120 meteors can be observed each hour at its height. More »

Myrtle warbler. Photo © zenbenscience, via creative commons & flickr

While we await the region’s autumn rains, the rest of the country prepares for winter. After last year’s ordeal, flocks of Snowbirds east of the Rockies are preparing their escape routes.

Some will visit our region. Others will head south.

Our behaviour mirrors a time-honoured tradition begun by our feathered friends eons ago. Scientists recently established that the region’s migrating birds are at heart northern residents that, like their human counterparts, head south to avoid harsh winters.

For years, scientists believed migrating birds first started leaving southern territories to travel northwards across and between continents because of intense competition for space and food in the crowded tropics. After all, most songbirds in the Americas, including those that don’t migrate, live in the South American tropics, and most migratory species have close tropical relatives.

But that theory is now turned upside-down, geographically speaking. After analyzing the family trees and territorial origins ofsparrows, warblers and blackbirds—which together make up the largest group of North American songbirds—scientists found that long-distance migration was twice as likely to arise among bird ancestors from temperate regions than among ancestors from the tropics.

The majority of the species started migrating by moving their winter ranges southwards.

Read the rest of this editorial at the Victoria Times Colonist….

Ploughing snow in Winnipeg. Photo © AJ Batac

I spent some time in Winnipeg before the holidays. While there, I had the dubious pleasure of experiencing, among other things, a goodly period of the city’s second coldest December on record.

Yay, me.

I grew up on the prairies, and I thought I knew what cold was. But apparently my time in Alberta was misspent. My time here in Victoria has made me even softer and weather-wimpier.

As many prairie-folk-come-to-Victoria can attest, –46-degree windchill is Something Else. Minus 46-degree windchill atop –35 degrees out of the wind, for day after day after day, is also exhausting and, in my case anyway, cranky-making….

Read the rest of this editorial in the Victoria Times Colonist….

Kananaskis Country in winter. Photo by Brian Uhreen,

Although weather in Alberta’s mountains can be counted on to be unpredictable, when it’s sunny, it’s glorious. Photo by Brian Uhreen

Explore Kananaskis, Winter/Spring 1997Covering more than 5,000 square kilometres, Alberta’s Kananaskis Country encompasses everything from foothills in the east to the rock, alpine Continental Divide in the west, from the wide, windswept Bow River Valley in the north to narrow passes and valleys in the south.

With such variety in terrain, elevation and exposure, one of the few things you can count on regarding weather in the wilderness region is that is it unpredictable. The adage, “If you don’t like the weather, wait five minutes,” applies.

Winter – generally

Winter in Kananaskis starts in November and lasts until March. Unless it starts in September. Or ends in May. There are years when an early drop in seasonal temperatures lowers the snow line soon after Labour Day. There are as many years when winter blasts on and on until June, at which time summer arrives, bypassing spring altogether.

Duelling weather systems

Kananaskis Country generally has two continental weather systems in play during winter. Frigid, dry Arctic systems from north or east blow without resistance over the prairie until they smack into the Rocky Mountains. These ramparts of stone funnel and deflect the air-flow southward. The arrival of these systems usually means cold temperatures and ice crystals in the air. These systems can also dump snow in the foothills while bypassing points further west.

Contrast that with the Pacific weather that blows in from the west coast. These systems tend to be warmer than Arctic systems, and are laden with moisture that falls as rain in Vancouver and turns to snow as they are forced up the staircase of mountain ranges across British Columbia. By the time the systems arrive at Alberta’s western reaches, the majority of the moisture has already condensed into clouds and precipitated out on the western side of the Continental Divide.

The amount of snow lessens the further east a wintertime Pacific system extends. Thus, West Bragg Creek, on Kananaskis Country’s east side, receives less snow from these systems than does Peter Lougheed Provincial Park, abutting the Continental Divide to the west.

Elevation effects

Cross-country skiing, in Kananaskis Country. Adam Kahtava photo -

Kananaskis Country is home to some of the best cross-country skiing in Canada. Photo by Adam Kahtava.

Elevation influences the differences in snowfall and accumulation between east and west Kananaskis Country. The higher you go, the colder it gets, the more likely that what precipitation there is will fall as snow, not rain. Snow accumulates; rain does not.

However, to every rule, there is an exception. Although higher elevations usually do mean lower temperatures, diehard winter outdoor enthusiasts have been known to leave Calgary where it is –35° C and spend a sunny day on Peter Lougheed Provincial Park trails in balmy –10° C temperatures. This winter phenomenon is called temperature inversion, and occurs frequently in this part of the world. Arctic high-pressure systems spread a thin layer of cold, murky and sometimes polluted air over the prairies and foothills valleys. One of the warmer western systems—as much as 15° C warmer—sits above it, trapping the cold air below.

To find out when to take advantage of a temperature inversion, compare Environment Canada’s Calgary forecast to its Banff forecast. If it’s warmer in Banff, temperature inversion is occurring.


Chinooks: spring in February

Chinook Arch at Sunset. Photo by Tuchodi,

Chinook Arch at Sunset. Photo by Tuchodi

East–west differences in snow accumulation can also be affected by recurring Chinook winds. Chinooks are a distinctive part of the Pacific weather system: as many as 10 times each winter, they blow in from the west, gradually chilling and dumping snow as they climb the British Columbia mountain staircase. With one final dump on the Continental Divide, a now-near-dry Chinook wind flows down the mountains to the plains, skipping over the Rocky Mountain front ranges and foothills like a rock skipping over water. As the wind descends, its temperatures rise faster than they had cooled on the ascent. Somewhere over the eastern edge of the front ranges, the Chinook encounters a very cold, Arctic high-pressure system locking the prairies in its frigid grip. What moisture remains in the Pacific systems condenses, forming a distinct arch of cloud along the line of the mountains.

The Chinook Arch announces a dramatic reprieve from winter. Temperatures can rocket from –30° C to +10° C in a matter of hours. Snow vanishes. Gutters fill. Spirits rise. Calgarians go home in the shirtsleeves, lugging parkas in their arms. Elk and deer, and antelope on the prairies further east, can feed and move about easily again.

Points west in Kananaskis Country tend to be frequently skipped over by Chinooks. Although these winds do occur in Peter Lougheed Park and the Spray River Valley, they tend to be weaker and more ephemeral there. The Bow River Valley sees the most Chinooks of all of Kananaskis, often serving to funnel them east out of the mountains and onto the plains.