Apparently the uppers at the moment are -7, if that's the case why is the temperature still above freezing? We had a snow shower earlier so the uppers are obviously OK as are dps, just the damn temperature refuses to drop yet again. Dry and clear now and still 3C. Any snow won't stick in that unless it's really heavy and does the evap cooling thing.
This "polar maritime" air is nearly always junk below 300m. It either gives temps that won't drop below 1 or 2C despite cold uppers and low dps, or it gives rain at temperatures of 1 or 2C. Once in a blue moon it produces a temporary cover (14th Jan), but only like 1 in 10 occurrences does that. High ground. Always bloody high ground with this PM stuff. If it likes mountains so much why doesn't it eff off to Nepal or somewhere, they're much higher than the Pennines!