Manuals and instructions for everything

why is weather so hard to predict

The view from Defynnog, Powys, after heavy snow
As snow forecasted fails to materialise again, why is it so difficult to predict? When rain is forecast it normally falls. When we are promised blue skies we can usually get out the sunglasses. But snow? Now that is a different story and so much harder to guarantee. But why? On Tuesday evening, up to 10cm (3. 9in) of snow was predicted to fall in parts of Wales, with yellow warnings from the Met Office telling motorists of possible travel disruption. But when curtains were drawn open on Wednesday morning, instead of being greeted by the crisp white stuff, the sight was of wet pavements.

So where were the predicted snow flurries and why was the forecast so wrong? The Met Office admits "will always be a challenge" in the UK as there is often a "fine line between whether it will rain or snow". This means a difference in height or air mass can completely alter the outlook. BBC weather presenter Rhian Haf said: "Predicting snow is harder than anything else. "Most precipitation falls out of the sky as snow to start with, but it melts to rain. " Snow is more likely in higher areas as the temperature is cooler, meaning rain may fall as snow in mountainous areas giving the dusting of snow on peaks which is commonly seen at this time of year.

Equally, snow is less likely to fall in urban areas because of the warmer surroundings. In central London it will rain sometimes, while a relatively short way away just outside the M25 there is heavy snow. "It only takes a tenth of a degree for it to be either rain or snow," said Rhian Haf. "When we predict snow it will be falling somewhere, it is just hard to say whether it will be in one place or another. " Since Donald Trump entered the White House, Slate has stepped up our politics coverageвbringing you news and opinion from writers like Jamelle Bouie and Dahlia Lithwick.

Weвre covering the administrationвs immigration crackdown, the rollback of environmental protections, the efforts of the resistance, and more. Our work is more urgent than ever and is reaching more readersвbut online advertising revenues donвt fully cover our costs, and we donвt have print subscribers to help keep us afloat. So we need your help. If you think Slate вs work matters, become a Slate Plus member. Youвll get exclusive members-only content and a suite of great benefitsвand youвll help secure Slate вs future.

  • Views: 142

why do we experience seasons in england
why do old people feel cold all the time
why is air a bad conductor of heat
you know you live in florida when
why is it important to study weather
why does it snow in new york
why does it rain so much in spring