On Dec 12, 12:15*am, Dave Cornwell wrote:
I defy anybody to claim they know what is going to happen in a weeks
time. The divergence of the output is such that there is almost 17 degC
difference between highest and lowest GFS ensemble members (850 hPa) for
* the whole period after the 20th. I'm reasonably confident that the
maximum temperature on Christmas Day will be between -2C and 10C.
Dave

Try looking at JMA, UKMO and ECMWF for further "customer
choice". My feeling is that it is going to be somewhat less cold than
the GFS runs shown in wetter3.de. As for the max on Christmas Day I'd
say you were being unfeasibly precise considering it's a fortnight
away, far more so than Suzanne Charlton who in December 1995 once
forecast that the min in Scotland on a particular night would be
between -3°C and -16°C. That should cover it but to be fair to her
she didn't have the time to elaborate, it being the 0030 R4 weather
slot when the pressure of scheduling is at its height as we all know.

Tudor Hughes, Warlingham, Surrey.