"G3 Watch for 4-5 June UTC Days" by NOAA Space Weather Prediction Center SWPC - A solar flare, more precisely a Coronal Mass Ejection (CME), may cause aurora at geomagnetic storm level G3 on Earth during UTC days June 4-5. G3 means expected Kp=7, with #AuroraBorealis down to US Midwest & northern Europe and #AuroraAustralis to South Island, New Zealand and Tasmania & Victoria, Australia. The forecast is short: #aurora may end before your sunset. https://www.spaceweather.gov/news/update-g3-watch-4-5-june-utc-days #astronomy