Posts Tagged ‘melt’

Some clarifications regarding winter conditions

Tuesday, February 9th, 2010

There has been recce going on today for Rally Sweden, and the impressions from the drivers seems to be varied. Home driver Patrik Sandell concluded the first day with the quote “a lot of snow but no ice = perfect for me!” while Norweigan driver Anders Gröndal has written on his blog that the rally will be “many of the stages will be more of a gravel rally than a winter rally”.

Gröndal’s reaction is interesting. Some drivers seems to be complaining about the conditions – and I understand if they have problems driving on snow. It’s complicated – for sure – and it should be! I’m sure I would be quite concerned if I were to drive a rally on it. However, Gröndal’s quote must be some other kind of problem, possibly some kind of overheating in his brain?! :) He has been driving a full day in the forests with around half a meter of snow all around him – and he can still claim that it’s not a winter rally? Come on, no matter if you reach the gravel – it’s still very much winter and wintry conditions, dear Gröndal. I’ll explain why…

So, here comes a short tutorial about the difference between snow, ice and water – dedicated to Anders Gröndal:

  • Snow is a type of precipation consisting of crystalline water ice (Full definition is on Wikipedia). In it’s fully frozen state snow feels really dry.
  • When snow melts, it results in fluid water. Quite logically, since it’s small ice crystals. This means, that when it rains on snow or when temperatures raise above zero – the snow on the road (since we’re talking rally here) gets softer and melts to water from the top.
  • If the temperature goes down below zero again, the partially melted snow layer will freeze again. The parts of the snow that is fully or partially melted will form a layer of solid ice on the road. This is the ice Gröndal is talking about – and missing.
  • If you’ve read all those three points, I guess you don’t find it very difficult. It’s like the very, very basics of winter weather and surfaces. And therefore it’s hard to understand that Gröndal doesn’t understand it. However, to call the current conditions (that for sure will include gravel after the loose snow is swept away) something else than proper winter conditions is just pure bullshit – and now you know why: The ice layer Gröndal is talking about is nice, for sure. But it doesn’t come from winter conditions – it comes from the _lack_ of winter conditions sometimes earlier in time…

So, for everyone of you coming to Sweden. Be cool. Gröndal will have to struggle if he isn’t good enough to drive on proper winter conditions (!) – but you will have a wonderful time with a lot of loose, cold snow out in the forests. It has just never melted since the winter started in early December – but to me that’s more a good sign than a bad!?!

Enjoy!

By the way, to Anders Gröndal: You don’t need to thank me for this guide. Be my guest! And if you still don’t understand – go to some local gas station here in Sweden and buy yourself a “glass” (icecream). Bring it into your cottage or hotel room and see what happens after a while. When it’s half frozen… Go out again and see what happens. Tada! It’s like magic!

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