Weak tornado confirmed south of Okotoks, weather officials say

The afternoon thunderstorm that swept over southern Alberta on Monday afternoon spawned a weak tornado near Okotoks.

Environment Canada says the estimated EF-0 twister was seen around 2:45 p.m. south of thecity, which is roughly 20 kilometres south of Calgary.

So far, there have been no reports of damage, weather officials said in a weather summary.

The storm also brought hail and powerful winds to parts of southern Alberta.

The confirmation of the weak tornado comesless than three weeks after anEF-4 tornado touched down in a rural area north of Calgary, where it destroyed several homes. No one was seriously hurt.

TheJuly 1 tornado was the most powerful one to have touched down in Alberta since the deadly "Black Friday" tornado that struck Edmonton in 1987.

The strength of a tornado is determined by the damage it produces. EF-0 is the weakest on the enhanced Fujita scale.