Barometric Pressure Forecast for Superior, Wisconsin
Barometric pressure forecast for Superior, Wisconsin — at the western tip of Lake Superior, across the harbour from Duluth. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Superior
Superior lies at the head of the largest freshwater lake on earth, on the flat clay plain where the St. Louis River empties into the harbour it shares with Duluth on the Minnesota hillside opposite. The lake governs the year. It holds enough cold water to keep spring here weeks behind the surrounding inland country, with onshore winds capping summer afternoons far below what the interior reaches, and it stays warm enough into early winter to fuel snow squalls whenever cold air crosses it. November is the month that defines the place. The temperature gradient between the still-warm lake and the first genuine Arctic air is at its steepest then, and the deep lows that result are the gales that sank the Edmund Fitzgerald and, decades earlier, the Armistice Day fishing fleet. Those storms can drop the barometer thirty hPa or more in a day and raise seas on the open lake that behave like an inland ocean. Deep winter is colder but quieter, dominated by high pressure and clear skies once the ice forms and cuts off the moisture supply.
What this means for you
November brings the steepest and deepest falls of the year here, not January. A barometric pressure forecast watched hardest in late autumn matches this lake's actual storm season.