A BOURNEMOUTH-based enthusiast has shared his guide to snow forecasting ahead of a potential cold spell next week.
Dorset Snow said on Wednesday that weather models are “incredibly supportive” of a “proper cold spell” by December 10.
He said wintry precipitation could be possible as soon as the weekend over high ground.
Read more: Could snow be on the cards this December? Forecaster gives their prediction
Sharing his guide to snow forecasting, he said: “Some people believe that if temperatures are cold enough, snow is likely to fall out of the sky, only to be disappointed when the thermometer shows 1C, but rain is still falling.
“It goes to show that there are many factors to consider when forecasting snow, and this is why it gives amateur and professional forecasters such a tough time.”
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He said the ideal temperatures for snow are below 3C generally, probably 2C and under.
Dorset Snow said: “Contrary to belief it can never be too cold to snow, but very cold air is normally accompanied by very dry air. Hence why very cold parts of the globe don’t always see massive amounts of snowfall.
“It can sleet/snow at higher temperatures, but this normally occurs in spring when we often see heavier showers and air masses that bring more favourable dew points.”
Read more: PICTURES: Snow, storms and heatwaves in Dorset through the years
He added dew points really need to be 0C or below for snow.
In terms of the ‘freezing level’, he said it needs to be 300m or below for snow to fall so it doesn’t melt before reaching the ground.
He said the heavier the precipitation, the better the chance of snow.
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Dorset Snow said this is because the precipitation falls to the surface faster and therefore has less time to melt.
Wind direction also has an impact and living by the coast, the sea breeze can bring in milder temperatures and “kill off” any snow.
He said: “If we have more of a northerly flow, then there is less chance of the wind ruining our chances.”
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