I’ll start with the forecast for Monday & Tuesday.
Colder air coming in from the East will lead to largely dry and cold conditions across the United Kingdom, a North-East airflow across Eastern areas could bring some snow showers across Eastern parts and down into South-East England, this is something that’ll need monitoring closer to the time when we’ll be able to forecast these potential snow showers more accurately.
The uncertainty comes from Wednesday onwards. Models today have thrown a spanner in the works and develop a short-wave near Norway, this prevents high pressure from developing to our North and instead allows the Atlantic to make inroads across the UK bringing increasingly milder conditions. The 12z GFS & UKMO model show this happening.
The GFS Ensembles however paint a different picture and show just how uncertain things become from Wednesday/Thursday onwards.
The above chart shows how the ensembles begin to become increasingly scattered from around the 13th onwards with some bringing in milder air far more quickly than others. This suggests a great deal of uncertainty in the final outcome. There is however growing support for a breakdown to more Atlantic conditions late next week, how this plays out however remains uncertain though there are two different options.
- Atlantic low pressure systems push in bringing milder conditions fairly quickly, a very short spell of snow followed by rain
- Atlantic low pressure systems attempt to push in but become slow moving, bringing a more significant spell of snow
The ECM shows how a slow breakdown will bring potentially widespread snowfall across many parts, the usual high uncertainties still apply, of course.
Things are finely balanced between the two solutions and it’s something that I’ll be keeping a close eye on in the coming days. Before that though, surprise snow events on Monday/Tuesday cannot be ruled out so keep checking back for updates on that.