Advisory: Thunderstorm - Parts of Alberta
Source: Environment Canada
Issued: Aug 11, 2026 at 18:04 HRS
History:
-
- Alert: Aug 11, 2026 at 18:04 HRS
- Update: Aug 11, 2026 at 18:30 HRS
- Update: Aug 11, 2026 at 18:54 HRS
- Update: Aug 11, 2026 at 19:10 HRS
- Update: Aug 11, 2026 at 19:28 HRS
Description: Yellow warning - severe thunderstorm - in effect
At 6:02 p.m. MDT, a line of severe thunderstorms is located from about 20 km west of Monarch to Nobleford. These severe thunderstorms are moving southeast at 45 km/h. Damaging wind gusts, loonie to ping pong ball size hail and heavy rain are possible. Locations and nearby areas that could be impacted include: Nobleford, Monarch, Lethbridge
Heavy rain may cause flash flooding and significant reductions to visibility. Large hail may cause significant damage and injury. Severe thunderstorm warnings are issued when imminent or occurring thunderstorms are expected to produce damaging hail, wind or rain. Severe thunderstorms can produce tornadoes.
Area: M.D. of Willow Creek near Granum and Peigan Timber Limit
Affected areas (11):
- Willow Creek No. 26
- Granum
- Fort Macleod
- Blood 148
- Lethbridge County
- Coalhurst
- Nobleford
- Barons
- Picture Butte
- Coaldale
- Lethbridge
Action to take:
- Take immediate cover if a thunderstorm approaches
- If outside, protect yourself from flying debris and hail
- When thunder roars, go indoors! Lightning kills and injures Canadians every year


