It starts with a calm and still water. Next you hear it rumbling against the flow of the river. The unmistakable sound, thundering seemingly against the law of physics is the Severn bore. Few natural phenomena are as impressive as the Severn tidal bore.
The stage for Mother Nature's show; is an unassuming sleepy corner of Gloucestershire, England. A large tidal surge makes its presence known while observers watch excitedly from the banks of the Severn. Having experienced it for myself, I strongly recommend that seeing this amazing sight is one to add to your bucket list.
The Frequencies of the Severn Bore
The Severn Bore doesn’t adhere to a strict timetable but luckily, its appearance is reasonably predictable. This tidal spectacle predominantly occurs around 12-13 times a year, chiefly during the spring and autumn equinoxes when the gravitational pull from the moon and the sun combine to influence Earth's large bodies of water to their highest degrees. The exact dates and times of the bore can be anticipated based on the lunar cycle, with high amplitude waves most commonly appearing a day or two after the first full or new moon following the equinoxes.
Not all Severn bores are made equal. Commonly the predictions are graded 1-5 to signify the probability, with 5 being the highest.
🏄‍♂️ See the predicted Severn bore dates and times
🌊 Read about spring and neap tides
The Science behind the Severn Bore
The Severn estuary, which funnels into an increasingly narrow channel while simultaneously shallowing, provides all the ingredients needed to cook up a bore.
As the incoming tide from the Atlantic Ocean and up the Bristol Channel travels up the Severn estuary, the water is confined into a progressively constricting and shallowing channel, forcing the tide to surge upwards and forwards. This generates a single, often substantial, wave. The bore can reach heights of up to two meters and travel at speeds around 10-13 miles per hour. This provides a unique spectacle and experience for adventurous surfers, SUP boarders and canoers, who often take advantage of the surge.
The bore’s magnitude and timing are influenced by various factors, mainly the time of year, the phase and position of the moon, wind direction, and atmospheric pressure. It’s the amalgamation of these components that delineates the precise nature of each bore event, making every appearance uniquely enthralling.
Did you know?
The Severn Estuary, the starting point of the Severn bore has the second largest tidal range in the world.
🌊 Find out about the largest tidal ranges in the world
Surfing the Severn Bore
Surfing the Severn Bore is an unparalleled experience and attracts a dedicated group of surfers and enthusiasts who chase this remarkable wave. The continuous ride provides a unique surf of length and duration that ocean waves simply cannot offer. Surfing records have been established on the bore, with rides lasting for several miles and extending over an hour.
Embarking on the journey to ride the Severn Bore is not merely a surfing experience; it's a unique adventure that navigates through some of the UK’s most picturesque and notable places. As surfers ride this exceptional wave, they traverse a collection of England's remarkable landscapes and historical sites, all while surfing one of the world’s most renowned tidal bores.
Minsterworth
A quintessential starting point for many bore surfers, Minsterworth offers expansive vistas and a popular viewpoint for both spectators and surfers alike. The Severn Bore Inn, located conveniently close to the river, provides an excellent viewing spot and is traditionally a gathering point for the surfing community and onlookers. Surfers often start or finish their rides here, as the bore manifests prominently in this segment of the river. While you're there, The Severn Bore Inn offer an exceptional all-you-can-eat breakfast, served up by the warm and welcoming staff - a visit is highly recommended.
Newnham on Severn
Newnham on Severn is another favoured spot for bore riders. The curvature of the river here can amplify the bore, making it a thrilling section to surf and to spectate. The village also brings historical charm and offers visitors a glimpse into the rich tapestry of Severn’s past. For those interested in prolonging their stay, Newnham provides quaint accommodations and a serene environment to relax post-surf.
Stonebench, Elmore
With its tranquil and scenic landscape, Stonebench in Elmore is an ideal spot for those who wish to immerse themselves in the serene beauty of the Severn while observing or riding the bore. Surfers navigating through this point are treated to a natural spectacle, as the lush surroundings enhance the ethereal experience of riding this lengthy wave.
Gloucester
The historic city of Gloucester, with its rich maritime heritage, provides both an urban backdrop to bore surfing and a contrast to the more rural locations along the river. The bore is usually smaller by the time it arrives at Gloucester, making it suitable for those looking to experience a more moderate wave. Moreover, the city offers an array of amenities, historical sites, and post-surf activities for visitors to explore.
Epney
Epney, a beloved spot among the bore surfing community, offers a harmonious blend of vibrant energy and serene landscapes. The river’s width here provides a different surfing dynamic, with the bore occasionally splitting around the river island. Spectators often gather at the local pubs, making Epney a lively hub during bore events.
Severn bore timings
Newnham: Approximately 15 minutes before high water at Avonmouth.
Stonebench: Around 1 hour after high water at Avonmouth.
Over Bridge: Around 1 hour and 20 minutes after high water at Avonmouth.
But riding this tidal wave demands unique skills and an understanding of the river’s dynamic. The wave can appear as a tranquil rolling water one moment and transform into a robust, surging wave the next, requiring surfers to be adept and vigilant. Beyond merely surfing, the bore surfers must navigate obstacles like sandbanks, debris, and the riverbanks themselves, transforming each ride into a navigational challenge.
For those observing, the flood defences that flank the river Severn are steep and can become slippery, so spectators are encouraged to keep to the tops of the bank. It does get busy too, so extra care should be taken to ensure everyone is safe and has space to watch.
Conservation and Respect
I believe that such a beautiful phenomenon should be experienced first-hand, but it's imperative to acknowledge the necessity for conservation and respect towards the Severn Bore, and that respect should extend to the locals. Roads can become busy, with cars parked up the banks. Be mindful that you may be blocking a driveway or preventing someone from getting to work. Remember, it's a habitat for wildlife too, so avoid leaving paths or dropping litter.
To wrap this up, the Severn Bore serves as a magnificent manifestation of natural forces at play, uniting the curious and inviting adventurers to ride its lengthy wave or watch from the sidelines. So, the next time the moon aligns, perhaps you too will find yourself on the banks of the Severn, basking in the majesty of the bore. Be sure to look out for me.
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