Environment Canada predicts that an El Ni帽o is on the horizon, promising northwestern B.C. warmer-than-average temperatures in the approaching months. Alyssa Charbonneau, a meteorologist with the weather agency, indicated that the expected El Ni帽o effects would probably begin close to Christmas and extend into the New Year.

鈥淚n Western Canada, we tend to see the impacts of El Ni帽o in late fall and winter,鈥� Charbonneau shared. 鈥淲e鈥檙e talking close to Christmas and even into the new year.鈥�

She highlighted that this forecast marks a noticeable shift from the past three years, which were characterized by La Ni帽a conditions. 鈥淭he past three years have been La Ni帽a, so this will be quite the change,鈥� she noted.

El Ni帽o and La Ni帽a are opposite phases of a natural climate pattern across the tropical Pacific Ocean that swings back and forth every three to seven years on average.

El Ni帽o is characterized by unusually warm ocean temperatures in the Equatorial Pacific and generally brings warmer-than-average temperatures over western and central Canada. On the other hand, La Ni帽a is associated with colder-than-normal ocean water in the same region, often resulting in colder-than-average winters in western and central Canada.

Both El Ni帽o and La Ni帽a significantly influence weather and climate all around the globe.

The long-range forecast, according to Charbonneau, suggests a winter that could be gentler than those the area is accustomed to. However, she also pointed out that there is no clear consensus on expected precipitation levels during this period 鈥� conditions could swing between drier and wetter than usual.

鈥淚n the long-range forecast, as we look towards Christmas and even afterwards, we鈥檙e seeing indications of a potentially milder than normal winter in northwestern B.C. In terms of precipitation, we don鈥檛 really have a clear signal, so it could be drier, or wetter,鈥� she explained.

Current weather patterns in the region are wet, particularly affecting coastal areas like Prince Rupert with storms. While these wet conditions are expected to temporarily subside, they鈥檒l likely resume shortly after. However, Charbonneau acknowledged that the forecast becomes less certain beyond the next few weeks, citing the inherently unpredictable nature of fall seasonal forecasting.

鈥淏eyond the next few weeks, our forecast guidance is a bit murkier. Without a strong signal in the fall from things like El Ni帽o, fall seasonal forecasting is quite hit-or-miss and our seasonal models don鈥檛 always have a lot of skill, in terms of forecasting conditions,鈥� she clarified.

Looking at the months of October, November, and December, Charbonneau mentioned there鈥檚 a 50 to 60 per cent probability of temperatures being above the norm in northwestern B.C. However, she advised that this doesn鈥檛 rule out the occasional cold spell. 鈥淚t really washes out a lot of detail, in terms of the weather. It doesn鈥檛 mean that we couldn鈥檛 also see some cold spells mixed in there,鈥� she said.

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Regarding the specific details of daily temperatures, highs, lows, and variations during this three-month span, Charbonneau explained that the general data doesn鈥檛 offer much insight due to the long averaging period. 鈥淭hat information is not going to tell us too much about what the day-to-day weather is going to look like because that鈥檚 averaged over such a long period, but the best we can say is that there鈥檚 a chance of above-normal temperatures over the wall and it鈥檚 a bit hard, at least at this point, to pinpoint exactly what that鈥檚 going to look like in terms of daytime highs or overnight lows, or anything like that,鈥� she elaborated.

Areas like Terrace might not see much sunshine, with more storms predicted to enter the region, resulting in predominantly cloudy and rainy weather. 鈥淲e might see a break, but beyond the next week or so, it does look like we have some more storms once against forecast to move into northwestern B.C. and it鈥檚 likely to continue to be cloudy, showery,鈥� Charbonneau noted.

Moreover, she added that averaging temperatures over a quarter can sometimes be misleading about daily weather conditions. 鈥淭he problem when we鈥檙e averaging temperatures over a three-month period is that it doesn鈥檛 really paint a very good picture of what the weather will be day-to-day,鈥� she explained.

Charbonneau also pointed out that every El Ni帽o is unique, and while the upcoming one signals a possibly milder winter for B.C., it鈥檚 essential to approach forecasts with caution.

When asked about the relationship between the record-breaking temperatures in the Atlantic Ocean and B.C.鈥檚 weather, Charbonneau expressed that it鈥檚 complicated to establish a direct connection, stating, 鈥淚t could have an impact for places, such as Atlantic Canada, but as to the direct link to B.C.鈥檚 weather, I can鈥檛 really comment on that.鈥�

Addressing the ongoing drought in northwestern B.C., Charbonneau mentioned that the recent rains, although beneficial, are not enough to counterbalance the longstanding precipitation deficit. 鈥淲hile recent rains are positive, it doesn鈥檛 look like we鈥檝e had enough rain in the last little while to make up for what we鈥檙e missing. We need to see a continued wet pattern for that, too, and luckily, we do see more storms and rain on the way,鈥� she remarked.

Discussing the Category 1 hurricane-strength winds that recently hit Haida Gwaii, she suggested that similar stormy weather might continue, potentially bringing strong winds to areas like Terrace depending on storm tracks. 鈥淭hose storms can bring strong winds to the Terrace area as well, depending on where the low tracks, Haida Gwaii and other coastal areas are accustomed to very strong winds that we often see in our fall season,鈥� Charbonneau concluded.

Looking even further, Charbonneau said that while we鈥檙e still in the early throws of fall, winter is approaching, as is the region鈥檚 first frost. In Terrace鈥檚 case, that date is, on average, Oct. 17.

Reflecting on the historical weather data, Charbonneau said that the record-low temperature in Terrace, -26 degrees Celsius, was documented on Dec. 16, 1964. 鈥淪ometimes in the winter, when we get into those patterns where that very cold, dry air masses settle over interior B.C. and you get those Arctic outflow winds, that combination can make it feel very cold as well.鈥�

Right now, though, forecasting Terrace鈥檚 first frost and temperatures that cold is incredibly difficult, Charbonneau said.

鈥淐urrently, there鈥檚 no indication that we鈥檒l get there in the next seven days.鈥�

Viktor Elias joined the Terrace Standard in April 2023.

Tips or story ideas? (250) 638-7283 ext. 5411 or viktor.elias@terracestandard.com.

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