I can’t see any logic in the yellow alert for ice that’s been issued this lunchtime by the Met Office for parts of London and the southeast (fig 1). I might be jumping the gun with this one, and they may will issue one later today for the Midlands and Wales, but these parts have seen 10 to 30 cm of snow today, surely this snow will still be around tonight, and any thawing of that snow would refreeze? So why no warning of ice for these places?
There has been freezing fog since 08 UTC this morning in Glasgow, and the temperature at 12 UTC is still -4.6°C. Why for goodness sake isn’t there a warning out for that? Perhaps they’ve been just too busy with the snow further south.
I thought that the Glasgow Bishopton was maybe playing up, so with the help of some Traffic Scotland website I’ve managed to find the offending freezing fog patch by the Erskine bridge on the M8 over the river Clyde (fig 3).
It’s a useful website made available by the Scottish government, but for goodness sake why do they restrict the website to show thumbnail images from their network of webcams?
Suddenly it’s all become clear, and now the Met Office yellow warnings of ice for tomorrow make perfect sense! Two and a half hours after they issued a yellow warning for ice for the southeast England, the forecasters at the Met Office have now just issued another yellow warning for ice (fig 4) that aligns with the earlier one to cover Wales, Midlands and East Anglia – cosmic!
My question to the Met Office is why the delay between the two? Why not just issue a blanket warning for ice that combines the southeast, Midlands, Wales and East Anglia, and then issue a separate snow warning just for the southeast corner? Of course the tricky bit would be to do all this at the same time, so that people who read the warnings get the impression that your approach was coordinated, which in itself would instill confidence with them that you knew exactly what was happening.
PS It’s still foggy on the M8!