EF1 Tornado — Mclean, North Dakota

2025-09-14 · near Mercer, Mclean, North Dakota

Event narrative

The tornado touched down about a mile west of Mercer near a farmstead which it then passed through. At this farmstead, the tornado caused extensive tree damage to the property with many branches and trees snapped, and a large tree uprooted. The tornado then partially destroyed a pole barn by ripping about one-half of the rafters off, and pulling out several large support beams along its southeast side that were buried about five feet deep. Debris was scattered up to one-quarter mile away, with large pieces of wood embedded in the ground along the debris field. From there, the tornado then crossed Highway 200, damaging trees on the north side of the highway. It then proceeded north and destroyed an unanchored and unoccupied mobile home on wheels being stored about six miles north of Mercer. The tornado then lifted about two miles north of the mobile home damage. Based on the damage done this tornado was rated EF-1, and from that wind speeds were estimated to be around 110 mph.

Wider weather episode

A low-pressure center moved north from South Dakota to North Dakota with a warm front lifting to the north. This resulted in strong low-level wind shear over central North Dakota. This shear combined with low cloud bases caused by a high amount of moisture in the lower atmosphere to produce multiple low-topped supercells which produced a low amount of lighting. From these supercells, 20 tornadoes developed over central North Dakota which moved in a generally southerly to northerly direction. Two tornadoes produced EF-2 damage. Near Denhoff in Sheridan County, multiple buildings including mobile homes and farm out-buildings were severely damaged along the tornado path, along with damage to many trees and some vehicles. This multi-vortex tornado had a total path length of approximately 13 miles. The second area of EF-2 tornado damage was about 13 miles west of Linton in Emmons County, where a barn was destroyed near Beaver Bay. Two other tornadoes produced EF-1 damage. Near Menoken in Burleigh County, there was damage to trees and the roof of a farm outbuilding. Near Mercer in McLean County, a pole barn was partially destroyed, and a mobile home on wheels was destroyed. Numerous other tornadoes occurred with no damage to evaluate. By National Weather Service policy, those tornadoes were rated EF-U (Unknown). Otherwise, no damaging straight-line winds were reported, and the only large hail reported was one inch in diameter, which occurred near Balfour in McHenry County. In addition, flash flooding occurred over parts of Burleigh and Morton Counties as a result of the heavy rain from the storms. Many vehicles were stranded in Bismarck as multiple roads were underwater, and in Morton County several rural roads had water flowing over.

View location on OpenStreetMap → (47.4850, -100.7380)

Source: NOAA Storm Events Database, event_id 1294937. Narrative written by the NWS forecast office that issued the report.