It's almost like a wave of heat has pushed up from the south on that breeze, in minutes. I'm watching the Durham Council weather stations website, and could literally see the temperatures rising at the same rate all over, with the stations a few miles north lagging behind and then catching up!
The nearest one to me is Bradbury, about 4 miles north of me, and at 12.50 it was recording 29.4, and those Vaisala roadside weather stations are obviously very accurate.
I'm at 29.7 now.
Even Tow Law over 1,000ft up in the Pennines was 26.1 at 12.40 and up to 27.4 by 12.50 as the warmth sweeps through there.