So much for the luck of the Irish.

The return of winter weather Thursday morning brought Calgary's streak of spring-like conditions to an end, just in time for St. Patrick's Day.

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Blowing snow reduced visibility and made for a slow commute on several major routes in and around the city as a spring storm moved around the area. 

Calgary Transit tweeted that the snowy conditions caused delays on most bus routes. 

14 and John Laurie blvd.

Traffic was bumper-to-bumper on 14th Street near John Laurie Boulevard on Thursday morning. (Ayesha Clough/CBC)

winter visibility

After enjoying weeks of a non-winter weather, Calgarians awoke to the return of more conventional March conditions on Thursday. (AMA)

EMS officials said they responded to about 10 collisions by 7 a.m., most of them without injuries.

Commuters report slow-moving traffic from Airdrie to Calgary along the QEII, and within the city on Deerfoot Trail.