An upper ridge is strengthening over north Europe and will be at its strongest during the weekend. It brings very warm, summer-like temperatures to parts of north Europe. Daytime highs will be up to mid-20s.

500 mbar geopotential height anomaly on midday Friday. Note also the broad area of low pressure across the southern half of Europe, with multiple embedded upper lows. GFS model guidance. Maps: Wxcharts.com.

Temperatures in parts of Norway, Sweden and Finland will reach above 20s, with daytime highs reaching into mid-20s locally. That is quite exceptionally warm for now, up to about 15 °C higher than the long-term average!

2 m temperature anomaly. GFS model guidance. Maps: Wxcharts.com.