Morning Briefing: Four things to know about Friday, November 21

Friday, November 21, 2014, 8:03 AM - Wintry conditions could make travel difficult for areas from Alberta through Newfoundland today. Here's your coast-to-coast active weather roundup for Friday, November 21.

1. Snow squalls, strong winds and winter storm warnings across parts of Atlantic Canada

A low pressure system that brought rain and snow to parts of Atlantic Canada will be exiting the region today. 

"Eastern Newfoundland could see another 5 to 15 mm of rain by the end of the day," says Weather Network meteorologist Brian Dillon.

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Snow squall warnings are slowly dropping across Nova Scotia with Iverness County - Mabou and North being the only areas at risk for seeing some snow squall bands today. 

In Newfoundland, strong winds continue for the Northern Peninsula east. Winds are expected to increase overnight tonight with gusts reaching 100 km/h. 

"These winds can be extremely dangerous as loose objects may be tossed by the wind and cause injury or damage," cautions Dillon.

In Labrador, blowing snow is causing poor visibility in the Eagle River, Postville and Norman Bay areas. 

"5 to 10 cm of snow are forecast for today and tonight," says Environment Canada in a blowing snow advisory. "Westerly winds gusting up to 80 km/h tonight and Saturday will gradually improve later in the day Saturday as winds ease."

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As for the weekend, cold and breezy conditions are expected throughout Atlantic Canada. Milder air arrives ahead of the next system starting Sunday.

2. Snow squalls could reduce visibilities across Ontario; Freezing rain to coat southern Ontario roads Saturday 

After the week Ontario's had, this probably won't come as a surprise.

More snow squalls are expected Friday with EC calling for 15 cm of snow for some areas.

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"Lake effect snow due to northwest winds will bring easing snow showers to western Lake Huron shorelines along with southern end of Georgian Bay," says Dillon. 

Areas under a snow squall watch include London, Woodstock, Listowel and Mount Forest. 

"Latest indications are suggesting some potential for a snow squall to lock in over areas closer to Lake Huron for a few hours tonight," says EC. "If this happens, locally higher snowfall amounts of 30 cm in 6 to 12 hours along with sustained near zero visibility in the strongest snow squalls are quite possible over Huron, Perth, Middlesex and Oxford counties."

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Local snow amounts of 15 cm are also possible for areas east and southeast of Lake Huron today.

Snow squalls have also returned to the Sault Ste Marie to Batchewana Bay areas. Motorists in and around those areas should be prepared for hazardous winter driving conditions throughout the day. 

Meanwhile, milder air is expected to arrive pre-dawn Saturday with a chance of light-freezing drizzle through southern Ontario, bypassing the GTA through the morning hours.

"By afternoon, the freezing rain/drizzle will switch over to a light rain," says Dillon. "About 5 mm is in the forecast." 

Windy conditions with warmer air is expected on Sunday, with rain expected later in the day for southern Ontario.

3. Two clippers affecting the Prairies

Two clippers will be impacting parts of the Prairies over the next couple of days. 

The first one is expected to bring light freezing rain and snow showers to parts of Saskatchewan and Manitoba today.

"Light freezing rain and snow showers are expected to the north of Saskatoon and Winnipeg, ranging from 5 to 10 cm," says Dillon.

The second clipper will form in Alberta overnight tonight and slide into southwestern Saskatchewan on Saturday. This system brings the risk of freezing drizzle to Calgary Saturday morning and snow showers through Northern Alberta.

"Edmonton can see 2 to 5 cm of snow, however, models suggest slightly more [however, no freezing rain/drizzle threat as temperatures remain below 0 C]," says Dillon. "Calgary could see a slight chance of freezing drizzle and then return to light snow showers for Saturday. Less than 2 cm is expected by the time the system pushes south." 

4. Moderate rain expected for the BC South Coast; snow for the Rockies 

The BC Rockies will receive moderate snow through Saturday with some regions receiving 10-20 cm, with higher amounts in mountain passes.

"Whistler could see between 10 and 20 cm of snow as well," says Dillon. 

Meanwhile, the BC South coast will receive a moderate dose of rain-showers, with the Vancouver region receiving 30 to 60 mm of rain, while Eastern Vancouver Island will receive 15-30 mm of rain. 

The heaviest rain will occur Friday, but unsettled conditions are expected through Sunday.

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