Yellow Warning: Severe Thunderstorm in Effect for Southern Alberta
This alert is no longer in effect.
ECCC issued it on August 12, 2026, 12 days ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this ECCC weather alert directly from ECCC's official public data feed. See our methodology for full source attribution and refresh cadence.
Environment Canada has issued a yellow warning for severe thunderstorms affecting the M.D. of Willow Creek near Granum and Peigan Timber Limit, including Nobleford, Monarch and Lethbridge.
Read this weather record in 30 seconds
- Record type
- Severe Thunderstorm Warning
- Affected area
- Southern Alberta
- Issued
- August 12, 2026
- Issuing authority
- ECCC
Storm notices can cover different combinations of wind, hail, lightning, and rainfall. Use the original notice for the hazards and boundaries attached to this specific record.
Record status: historical. It was issued 12 days ago; use the issuing agency's live warning service for current conditions in Southern Alberta.
Alert Details
Yellow warning - severe thunderstorm - in effect. Issued by Environment Canada. Effective from 2026-08-12T00:04:03-00:00 until 2026-08-12T02:01:03-00:00. At 6:02 p.m. MDT, a line of severe thunderstorms is located from about 20 km west of Monarch to Nobleford.
Affected Areas
M.D. of Willow Creek near Granum and Peigan Timber Limit. Locations and nearby areas that could be impacted include Nobleford, Monarch and Lethbridge.
What You Should Do
Severe thunderstorm warnings are issued when imminent or occurring thunderstorms are expected to produce damaging hail, wind or rain.
Expected Conditions
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. Heavy rain may cause flash flooding and significant reductions to visibility. Large hail may cause significant damage and injury. Severe thunderstorms can produce tornadoes.
Timeline
Alert effective 2026-08-12T00:04:03-00:00. Expires 2026-08-12T02:01:03-00:00.
Original source: ECCC Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this ECCC weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,038 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to August 12, 2026.
Frequently Asked Questions
Common questions about this ECCC weather alert.