“He’s not the Messiah. He’s a very naughty boy!” Storm Brian prompted a lot of posts on caravan forums as to whether or not it is safe to tow in high winds.
Since Autumn, the season of mist and mellow fruitfulness – and the Autumn gales – is also the season for windsurfers to be jolly, I thought that I would share some windsurfing wisdom with you!
Over 200 years ago, Mr Beaufort kindly came up with his scale for wind speeds describing the OBSERVED EFFECT of wind, rather than simply the measured mph. The Beaufort Scale helps greatly to put wind speeds into context;
|0||0 – 1||Calm||Calm. Smoke rises vertically.|
|1||1 – 3||Light Air||Wind direction seen by smoke drift but not wind vane.|
|2||4 – 7||Light Breeze||Wind felt on face; leaves rustle, ordinary vanes move.|
|3||9 – 12||Gentle Breeze||Leaves & small twigs in constant motion; wind extends light flag.|
|4||13 – 18||Moderate Breeze||Raises dust & loose paper; small branches moved.|
|5||19 – 24||Fresh Breeze||Small trees in leaf begin to move. Crested wavelets form on inland water.|
|6||25 – 31||Strong Breeze||Large branches in motion. Whistling heard in telegraph.|
|7||32 – 38||Near Gale||Whole trees in motion. Inconvenience felt when walking.|
|8||39 – 46||Gale||Breaks twigs off trees. Impedes progress.|
|9||17 – 54||Severe Gale||Slight structural damage; chimney pots & slates removed.|
|10||55 – 63||Storm||Sedom experienced inland. Trees uprooted; considerable structural damage.|
|11||64 – 72||Violent Storm||Very rarely experienced. Accompanied by widespread damage.|
|12||73 – 83||Hurricane|
Beware the Non-Linear Progression!
The progression of wind speeds up the Beaufort scale is not linear, it is exponential; this reflects the significant increase in force on sails (or caravans!) as the wind speed creeps up.
What else can affect the impact of wind?
- Sudden Gusts – wind speeds (forecast or reported) are always stated as an average. Gusts, caused by all manner of things (see below) can easily be one or more Force greater than average. Gusts happen suddenly; they can upturn the unwary caravan or knock it quickly into a snake!
- Climate – the same wind speed in a nice hot country will pack less of a punch than the cold, damp and much more dense air that we have in the UK.
- Wind Direction – a strong headwind is catching only the narrowest face of a high-sided vehicle. A side wind has a big target – it will hit you like a steam hammer!
- Terrain – Wind will funnel through narrow spaces, such as valleys or between buildings. It will be blocked by or accelerated around obstacles. Both of these effects will strengthen gusts. In view of the photo below, I also feel bound to mention katabatic winds – cold air tumbling down mountainsides.
But There are Lorries on the Road…
In high winds, sailors have the option to reduce the number of sails or reef (fold) the sails to present a smaller area to the wind. Windsurfers simply select a smaller sail. An unladen Tautliner lorry can remove its curtains. Caravanners have no way of reducing the area of caravan available to catch the wind!
Caravans are large and tall, but they are relatively light. My rig is similar in size to an articulated lorry, but the caravan weighs in at feeble 1.5t, so it is much more likely to be buffeted and thrown off course by the wind than a fully-laden HGV, which weighs in at 40t!
I’ll be OK if I keep my Speed Down, won’t I?
“You’ll be FINE if you drive at 50mph.” There is no doubt that speed has a lot to do with safety, but it is misleading to suggest that simply reducing speed means that there is no risk when towing in wind, or in adverse weather of any kind.
High winds will significantly increase the risk. But it is just a risk. There is always a chance that you (and the other road users that you put in danger) might get away with it. Or, on the other hand, you might not!
The Dangers of a DEADline
“But I’ve got to get there by…” Disaster Analysis almost always points to poor decision making and/or an arbitrary deadline of some sort as the root cause.
When a deadline comes into play, people tend to take risks that they would not otherwise even contemplate. “It’s the last day of my holiday. I have GOT to ski that avalanche-prone couloir. It’s my last chance!”
The awful disaster on Mt Everest in 1996 happened because the weather window was not quite long enough for the groups of climbers to make it to the summit and back. They knew that but decided to chance it anyway. After all, they’d climbed for days, acclimatised, paid lots of money to be there and might never get the chance again. Unfortunately, either descending or attempting to rescue their fellows, that decision cost 8 of them their lives.
What are the Risks in High Winds?
- Snaking or Overturning – Storm Brian delivered wind speeds of 40-50mph across the country. As mentioned above, gusts WILL be significantly greater than these averages. We have all experienced a sudden buffeting as we are hit by a gust or come out of a wind shadow; eg when overtaking a lorry. Just the sort of thing to knock you off balance – and your corrective actions are very likely to start a snake.
- Flying Objects – Actor Gordon Kaye (who played René in the comedy “‘Allo ‘Allo’) was critically injured when a lump of wood was blown through his windscreen during a storm. There is always a risk of branches or trees being brought down or other objects blowing around.
How Can I Live to Tow Another Day?
Personally, I would not choose to tow in what Mr Beaufort describes as a ‘Severe Gale’ with the potential for gusts into the realms of ‘Storm Force’.
So is your journey really necessary or would it be more sensible to postpone? If you’re already asking the question as to whether or not it is safe to tow, you clearly have some doubt in your mind! A saying that has kept me safe through many of my adrenaline-fuelled adventures is “If you look at it and think you’re going to die, you probably will!”
There are lots of fun things that you can do on a windy day. If I were desperate for a weekend away, I would book a B&B not too far away and eliminate the risk. That way, I would be sure that I would live to tow another day!
Alternatively, I would rig a very, very small sail and get me straight out windsurfing!
Obviously, this is my humble opinion but I hope that it helps you with the decision making process.
Please also see my related blog, The Knowledge – Towing Safely & Legally
XC Weather is a very useful weather forecasting website which shows wind maps of the country and also gives an idea of the likely strength of gusts.
Thank you to my friend Wayne for allowing me to use the photo of him enjoying Storm Brian on Chesil Beach. Wayne is a driftwood demon, who makes beautiful mirrors and furniture from the wild, wooden bounties of the ocean. Wayne was featured on Ben Fogle’s “Harbour Lives”. If you would like a unique piece for your home or a custom-made present for someone special, check out his website at Surf Mirrors