Heads up! It’s SNOWING on the Okanagan Connector between Aspen Grove and Brenda Mines. Low freezing levels + unstable airmass = thundersnow! Threat continues through this morning. #BCHwy97C #DriveBC #BCstorm pic.twitter.com/x4186MEVAW
— ECCC Weather British Columbia (@ECCCWeatherBC) June 19, 2019
A thunderstorm with snow is called thundersnow and it struck the British Columbia Interior just two days before the start of summer!
An unstable air mass bringing cold air from Alaska is to blame for the rare thundersnow which covered mountainous terrain in the Okanagan Valley with about 10 cm.
Snow fell above 1500 metres with a snow/rain mix down to 1100 metres and a chilly rain at sea level.
About 10 cm of snow was also expected in the Alberta Rockies from a similar system.