Took some time to process the GFS 12z run. What an extreme northerly that produced!
The model has just made an embarrassing climb-down on the opening four days of the month, mind. My CET estimate to 4th for that run is a staggering 3.2°C higher than the one from the 12z of yesterday .
As if in retaliation, in then gives me a CET estimate of just 1.4°C for 6th-9th, taking my estimate to-date down to the mid-4s °C.
Along the way, there's a possible sub-4°C daily maximum CET on 6th and several overnight minimums in the 3 to -4°C range. As a mean across the three sites. About a week into April. Sheesh!
Fair to say, that's an outlandish solution. Yet it seems to sit within an ensemble spread that ventures even colder. Earlier today I saw one doing the rounds that brought 850s down near -20°C to Scotland. Resulting temps would be subzero by day even at sea level!
At the other end of the scale, an increasing number of model runs have been sending the coldest air west of the UK, leaving us under chilly, cyclonic conditions. A warm-up from the southeast thereafter is still on the table but seems less supported than it was 24 hours ago.
So much to contemplate as the 4th leg of this year's competition looms!
Originally Posted by: Stormchaser