Meteorological conditions are expected to be conducive to seeing the spectacle, which is caused by an interaction between the Earth’s magnetic field and charged particles from the sun entering the planetary atmosphere.

“Let’s look at the sky tonight,” the Meteorological Office wrote on Facebook on Tuesday. “There will be very good conditions to observe the Northern Lights even in southern Poland. A Class G3 geomagnetic storm is forecast. In many places it will be cloudless; short-lived and not very thick fog may hamper us locally in places.”

Geomagnetic storms are rated from G1 (mild) to G5 (severe) so G3 is expected to provide sky-gazers with a heavenly show. The Northern Lights, or Aurora Borealis, have been visible in Poland several times this year already, with a particularly vivid display in May.

Astronomical blogger Karol Wójcicki wrote on social media that the geomagnetic storm will be caused by a coronal mass ejection (CME) heading to Earth from the sun. He said it was not known when the CME would hit the Earth’s atmosphere, but if it struck at around 7 or 8 p.m., the lights should be visible at around 10 p.m.

The last time such conditions occurred was over twenty years ago, in 2003.