On Twitter, the CHMÚ told people of the possibility shortly before sunset. “Tonight there is hope for the aurora borealis – an hour ago material from the corona’s eruption arrived at earth from the sun. Try to catch a glimpse of the lights toward the northern horizon, but a dark sky is a must. The cloudiness will be variable, but in the Czech Republic, there is hope for partly clear skies in the evening. We are monitoring the situation,” they said.