Felt really cold during the day today (measured 6C at around midday),
however when I was out this evening it felt significantly warmer (it was
drizzling as well). Just checked the Met Office surface observations for
Heathrow and it appears the temperature has steadily climbed through the
evening and is now in double figures. At this rate I'll be able to warm
the house by opening all the windows. Is there a warm sector going
through currently? It is not obvious on the Met Office pressure charts.

It is interesting to see how advection can completely dominate the
diurnal cycle at this time of year.