North Dakota has shattered its yearly tornado record after a single outbreak produced more than 20 twisters across the state and neighbouring South Dakota. The National Weather Service confirmed that the storm system, which stretched over a 200-mile area, pushed the state's annual total to 73 tornadoes, surpassing the previous record of 61 set in 1999.
The outbreak began in Mobridge, South Dakota, where tornadoes flipped vehicles and downed power lines. In North Dakota's capital, Bismarck, the same system brought more than 50mm of rain in under an hour, causing flash flooding and stranding vehicles. September rainfall reached 61.9mm, far exceeding the monthly average of 43.7mm and marking the wettest September in 31 years.
Meteorologists attributed the rare event to a combination of a low-pressure system, low wind shear, and a warm front that created ideal conditions for storm formation. Moisture and warmth from the North Pacific Ocean added extra energy to the atmosphere, increasing the likelihood of tornadoes across the Northern Plains.
Meanwhile, the Atlantic hurricane season remains quiet due to dry air and strong wind shear. However, Tropical Storm Gabrielle has formed in the central Atlantic, with sustained winds of 45mph (72km/h). Currently located 800 miles east of the Leeward Islands, Gabrielle is expected to track north-west towards Bermuda but poses no immediate threat to land.
The US National Oceanic and Atmospheric Administration's climate prediction centre forecasts more favourable conditions for tropical storms in the Atlantic during the second half of September, mirroring last year's active late-season pattern.
