Severe Thunderstorm Warning Severe Thunderstorm Warning issued August 23 at 7:39PM MST until August 23 at 8:30PM MST by NWS Tucson AZ Effective 7:39 PM MST, Sun Aug 23 through 8:30 PM MST, Sun Aug 23 Seek shelter inside a well-built structure and stay away from windows. This storm is capable of producing damaging winds and large hail. https://www.weather.gov/twc/ #Thunderstorm #SevereThunderstormWarning