Tag: edmonton

Alberta

Major Snowstorm Slices Through British Columbia & the Prairies

A Major Pattern reversal is underway across Western Canada. Cold air will descend from Northern Canada beginning Friday, coinciding with an extended period of heavy snowfall.

Our forecasting team will be closely monitoring the progression a major winter storm beginning Thursday evening. The Winter Storm isn’t expected to bring heavy snowfall rates, but rather an extended period of light-moderate snow over the next 48 hours.

The heaviest snowfall totals are expected through the Rockies; across British Columbia and Alberta. Where in excess of 50cm of snow is expected to fall. Even major cities, such as Edmonton won’t escape the wintry weather. With 30 or more centimeters projected to fall, over the next couple days.

Projected Snowfall Totals through Saturday PM
**Click map to make it zoomable.
Alberta

Tornado & Damaging Hail Threatens the Edmonton Region

A potent severe weather setup is expected today (July 20th 2018) in the Western Prairies. 

Thunderstorm risk map for today. The highest severe threat is highlighted in red – which includes Edmonton in a risk for tennis-ball sized hail and an isolated tornado. 

Environment Canada Discussion (PASPC):

ALBERTA 

A low pressure system developing in Alberta with an associated trough swinging through west-central Saskatchewan in the afternoon will trigger scattered severe thunderstorms. The main threat with these storms will be large hail. In the northwest section, there is a potential for supercells to develop with the potential of producing a tornado. The severe potential will last into the evening but thunderstorms are expected to persist into the overnight.

SASKATCHEWAN 

A low pressure system developing in Alberta with an associated trough swinging through west-central Saskatchewan in the afternoon will trigger scattered severe thunderstorms. The main threat with these storms will be large hail. In the northwest section, there is a potential for supercells to develop with the potential of producing a tornado. The severe potential will last into the evening but thunderstorms are expected to persist into the overnight.

Environment Canada’s Thunderstorm Outlook for today July, 20th 2018. Highlighting an extreme risk for severe thunderstorms in the Capital Region.

TECHNICAL DISCUSSION

A low pressure system will form south of Edmonton today with an associated cold front extending southward along the northern foothills and warm front through east-central Alberta and into Saskatchewan. Severe thunderstorms will trigger along the cold front early in the afternoon. They will likely be isolated in nature at first, before becoming a severe line of thunderstorms. The warm front will track through the area in the morning followed by a trough in the afternoon. Severe thunderstorms are expected to trigger along the trough in the afternoon. There is the potential for the right conditions to align near and to the east of Edmonton for a tornado to form, with the potential extending into west-central Saskatchewan, albeit, less likely than the risk in Alberta. MLCAPE values are between 1500 to 2200 J/kg with 0-6 km shear values around 30 kt with values up to 40 kt in and around the Capital region in Alberta. RDPS prog tephis are indicating idealized veering hodographs, conducive to tornado development, however, tornado formation in this area will be highly dependent on a few factors: There is the potential that the low level shear will be too much for the marginal CAPE in some areas, essentially shearing the storms apart. As well, on the Saskatchewan side, LCLs are progged to be around 1500 – 2000 m, which is a little high for tornado development, whereas, on the Alberta side, LCLs are progged to be 1000 m, which is more favourable for the formation of tornadoes. In addition, models are indicating the formation of a dryline that will bulge out into the southwestern corner of the Lloydminster region which may also be an area to watch for a tornado to develop in the later afternoon hours.

*Please note this maps and discussions are currently experimental and are not currently operational on Environment Canada’s website. 

Please closely monitor Environment Canada alerts today. Take any warnings seriously and seek shelter immediately. 

We will be monitoring the situation attentively.