Overview
- A coronal mass ejection that left the Sun on June 26 is forecast to reach Earth around Monday night into Tuesday and could spark geomagnetic activity and visible auroras.
- NOAA currently predicts a minor G1 storm with a Kp near 5 for Monday night, which could make the northern lights visible in parts of states along the U.S.–Canada border and across Alaska.
- NASA models and the UK Met Office say the event has a non‑zero chance of briefly reaching G2 strength and that elevated activity could continue into July 1, so forecasts may be revised rapidly.
- Long daylight after the solstice and the full Strawberry Moon on June 29 are likely to reduce ground visibility, so viewers are advised to travel north, find dark clear horizons, and watch around local midnight.
- Observers should use NOAA and aurora apps to monitor real‑time solar wind data and the interplanetary magnetic field's Bz component because a sustained southward Bz determines whether incoming plasma will trigger stronger displays.