National Weather Service United States Department of Commerce


A prolonged severe weather event impacted western and central North Dakota on Thursday, June 14, 2018. The first warning was issued at 1056 AM CDT for a severe thunderstorm entering far northwest North Dakota from Montana. A big thanks to NWS Grand Forks who backed up NWS Bismarck and issued warnings through the morning and into the early afternoon during a communications outage. This was a significant collaboration effort between the two offices. After a lull during the mid afternoon, thunderstorm activity began to increase once again around 300-400 pm CDT across northern North Dakota and into southern Canada. Capping, or warm air aloft, suppressed thunderstorm development across southern North Dakota ahead of an advancing warm front during the afternoon. During the late morning the Storm Prediction Center (SPC), upgraded northwest and north central North Dakota to a Moderate Risk for severe thunderstorms with the potential for very large hail and a few tornadoes. Multiple supercells did impact northwest and north central North Dakota. The largest hailstone of three inches in diameter fell near Gardena (Bottineau county). One brief tornado did occur just east of Rolla in the late evening. Thunderstorms did increase through the evening further south and generally east of US Highway 85 during the evening as capping lessened, with the arrival of greater upper level lift and an occluding surface front.
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