SEVERE THUNDERSTORM WARNING for Ottawa & Delaware Counties until 5:30pm News by: Jessica Schaer Posted: Apr 20, 2020 / 04:41 PM CDT / Updated: Apr 20, 2020 / 04:41 PM CDT NORTHEAST OKLAHOMA. — A Severe Thunderstorm Warning is in effect until 5:30pm for Ottawa and Delaware Counties. 60 mile per hour winds and quarter-size hail are the main threats. Take cover inside, in a sturdy structure. Download our mobile app for both Apple and Android to know when a severe storm is near you.