Britain faces a 'short-lived but quite intense' spell of hot weather this weekend with temperatures building up to the hottest day of the year so far by Monday.
Warm air will move up from Europe tomorrow and through Sunday and Monday when temperatures could hit 34C (93F), before conditions cool again on Tuesday.
England and Wales are expected to get to the low 30Cs (high 80Fs), with high teens (mid-60Fs) and low 20Cs (low 70Fs) forecast for Scotland and Northern Ireland.
Tropical Storm Debby, which battered parts of the southern US earlier this week, will contribute to the heat by shifting the jet stream - a current of strong winds in the atmosphere which has a significant influence on UK weather - further south.