A line of showers with embedded thunderstorms moved through the Bismarck-Mandan area between 10pm-10:30pm CDT Friday night, June 15. As the line moved closer to Bismarck-Mandan, an outflow boundary raced out ahead of the main line of showers and thunderstorms.
The Bismarck radar (KBIS) detected a maximum wind speed of 67 mph at 353 feet above ground level (AGL) 12 minutes before a 61 mph gust was recorded at the Bismarck Airport (see image below). This was a very localized speed maxima that headed straight towards the airport. Other peak wind speeds in the area did not even register 50 mph winds (see table below).
Site Max Wind Speed
Bismarck Airport 61 mph
Mandan AWOS 43 mph
6 N Bismarck 41 mph