We are watching the risk for some scattered severe thunderstorms across portions of Alberta and Saskatchewan.
Areas in orange and marked with a '4' can expect a strong risk of severe thunderstorms. This extends from Drayton Valley and Rocky Mountain House eastward towards and through Leduc, Ponoka, Killam, Vegreville, and Lloydminster. Into Saskatchewan, this risk extends from Lloydminster through to Bight Sand and Glaslyn, including Lashburn. The main threats in this region are heavy rain over 50mm, large hail between 3 and 6cm, an isolated tornado or two and damaging winds between 80 and 110km/h.
Areas in yellow and marked with a '3' can expect a moderate risk of severe thunderstorms. This extends from Ninton Junction and Pembina Forks east towards and through Mayerthorpe, Edmonton, Smoky Lake, Elk Point, and St. Paul. This risk also includes towards the south extending from Caroline and Sylvan Lake through Red Deer, Halkirk, and Provost, including Veteran and Endiang. In Saskatchewan, this risk extends from the Alberta border through to Unity and North Battleford, including Blaine Lake and Spiritwood. This also includes Tramping Lake. The main threats are heavy rain over 50mm, large hail between 2 and 4cm, locally bigger and damaging winds between 80 and 100km/h, locally 110km/h. An isolated tornado is possible in this region.
Areas in green and marked with a '2' can expect a low risk of severe thunderstorms. This extends from Robb and Edson north through to Whitecourt, Fort Assiniboine, Dapp, Newbrook, Vilna and Bonnyville. Towards the south, this includes Olds over towards Three Hills, Sheerness, Oyen and Compeer. In Saskatchewan, this includes an area from Pierceland over to Meadow Lake, Leoville and Shellbrook and an area from Kindersley through to Plenty, Biggar and Rosthern. The main threats in this region are heavy rain over 50mm, moderate to large hail between 1 and 3cm as well as damaging winds between 70 and 90km/h, locally 100km/h.
Elsewhere, areas in blue and marked with a '1' can expect mainly non-severe thunderstorms.
In Alberta, there is some question as to whether severe thunderstorms may be possible from Drumheller and Oyen south towards Brooks and Medicine Hat including Great Sand Hills and Maple Creek in Saskatchewan. Due to this low and questionable risk, we have left it out of this forecast map.