Penticton NewsSevere thunderstorm warning issued for South OkanaganOFD preparing for floodingPhoto: File photo Severe thunderstorm warning issuedUPDATE: 9:16 p.m. Environment Canada says its meteorologists are tracking a severe thunderstorm capable of producing strong wind gusts, up to quarter size hail and heavy rain. Severe thunderstorm warnings are issued when imminent or occurring thunderstorms are expected to produce damaging hail, wind or rain. Environment Canada has issued a severe thunderstorm warning for the South Okanagan. Severe thunderstorm warnings are issued when storms are expected to bring damaging winds, hail or heavy rainfall.