Lake Effect Streamers Today

These "streamers" often affect us here in London, Ontario. The animated weather map shows a classic example from today's posting

Alerts for: London - Middlesex
Warnings

10:53 AM EST Wednesday 21 November 2018
Snow squall warning in effect for:

    London - Parkhill - Eastern Middlesex County
    Strathroy - Komoka - Western Middlesex County

Snow squalls are expected. Under the snow squall bands, visibilities will be significantly reduced due to the heavy snow combined with blowing snow, and snow will quickly accumulate.

Snow squalls this afternoon and evening.

A stiff and cold northwesterly flow of fresh arctic air will generate lake effect snow bands off of Lake Huron this afternoon and evening. Local snowfall amounts of 15 to 20 cm are expected in the strongest snow squalls if they are able to lock in for a few hours late this afternoon or this evening. Otherwise, snowfall amounts of 5 to 10 cm will be common.

Hazardous winter driving conditions are anticipated. Motorists should drive according to the road and weather conditions and allow extra time to reach their destination.

The lake effect snow will slowly taper off to a few flurries overnight tonight as winds diminish.

Snow squalls cause weather conditions to vary considerably; changes from clear skies to heavy snow within just a few kilometers are common. Visibility will be suddenly reduced to near zero at times in heavy snow and blowing snow.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@canada.ca or tweet reports using #ONStorm.
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