http://www.swpc.noaa.gov/news/g1-watch-15-february-2018
published: Thursday, February 15, 2018 08:24 UTC
A G1 (Minor) geomagnetic storm watch is in effect for 15 February, 2018. The G1 Watch has been issued due to the likely response associated with the arrival of an asymmetric halo coronal mass ejection (CME) glancing blow late on the 14 February to early 15 February UTC-days. The CME was first observed in SOHO/LASCO-C2 imagery at 0125 UTC on 12 February (8:25 pm ET on 11 February). Current background solar wind speeds are slower than routine model predictions, so the forecast arrival timing of the CME has been slowed from the WSA-Enlil CME model run prediction.