In the beginning of the next week, a warm front will appear over the west Europe starting on Monday in Spain and reaching its maximum on friday over the west of Poland. The front will increase temperatures up to 15°C (in Spain even 18°C)
The warm front is a product of a cyclone over the Atlantic sea, which travels to the east and north around the Iceland (around 970 hPa and then lower after reaching the Iceland). Therefore, we call the cyclone the Icelandic Low and it brings oceanic climate into Europe. It means rain and on mountains even snow precipitation.
Warning: In Poland, Czechia and Austria, a freezing rain can occur!