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Accurate Weather Forecasting

Having accurate, reliable weather forecasts is key to making the right decisions on gritting and snow clearance

weather forecasting

Accurate Weather Forecasting

Having accurate, reliable weather forecasts is key to making the right decisions on gritting and snow clearance.   In the UK, two of the main weather forecast providers that help organisations and gritting service companies gain accurate weather forecasts are:

  • Netweather FreezeAlert

Established in 2003, Netweather is one of the leading independent weather forecasting companies in the UK. FreezeAlert is used by winter maintenance contractors for 1000’s of sites across the country every winter and has been constantly developed and updated since its inception in 2009. Netweather uses a combination of data from the UK Met Office, National Oceanic and Atmospheric Administration (NOAA) and their own in house forecast models for all of their forecasting products, including FreezeAlert.

  • Met Office

The Met Office is a well-known and trusted provider of weather reports for gritting companies.  The Met Office offer either a site-specific forecast or a regional and national forecast for customers who have sites in different locations.  The forecasts can also identify the amount of snowfall and minimum road surface temperature.

CGM Group are happy to advise customers on the choosing a weather forecasting provider.

Considerations when looking at forecasts and deciding to grit

When looking at forecasts and deciding whether to grit, it’s important to be able to predict the road surface temperatures (RST) than relying on the air temperature.  The RST can be lower than the air temperature as the ground can retain the cold.

Both NetWeather and the Met Office use a similar traffic light reporting system, and when it shows red then gritting is recommended.

You should also look at the amount of cloud cover, as the clouds can act like a blanket and help  keep the RST temperature higher than if there was no cloud cover.

In winter the impact of the sun is reduced as the sun is at a lower angle and the rays are more spread out.  If your site has many tall buildings and trees this could prevent the sun being able to increase the RST.

Our experienced team will be happy to discuss the forecast and the other factors when determining whether to proceed with gritting a site.

Forecasting snow fall

According to the Met Office precipitation falls as snow when the air temperature is below 2 degrees Celsius, and in the UK the heaviest snowfalls tend to occur when the air temperature is between 0 to 2 degrees Celsius.

Generally, if the weather forecaster predicts 5cm or more of snowfall between midnight and 6am then snow clearance may be required.


CGM Group is an Award-Winning Regional Horticultural, Arboricultural and Landscaping Organisation. Our management team has a wealth of experience delivering small and large maintenance schemes across the region and consistently win industry awards


Significant experience in every service we offer


We love what we do - it makes our work enjoyable


We are independently owned and operated

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Our History

Back in 1985, a young and very entrepreneurial Tim Glover, set off on his adventure to provide grass cutting services to the local community here in West Norfolk. He sold his personal vehicle to purchase a brand-new VW Caddy, and bought his first ride on lawn mower, his brother fabricated and made his first trailer.

Fast forward to today, we are trusted by some of the biggest and well-known businesses in the country to offer a broad range of green contracting services, however, we still look after the needs of our smaller and domestic customers too, maintaining the long-term relationship that first developed all those years ago.

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