NASA's space weather model forecasts that a coronal mass ejection now on its way to Earth could cause an EXTREME geomagnetic storm (NOAA G5).

Erupted: 2026-10-10 16:15 UTC (N08W54, active region 14549)
Speed: 844 km/s (type C)
Width: 86° across
Heading: 54° west of the Sun–Earth line, 33° north
Expected at Earth: about 2026-10-12 00:43 UTC
Forecast Kp: 8 to 9 (the 0–9 storm scale)

What a storm this strong can do: possible grid collapse or blackouts and transformer damage; HF radio out for days; satellites damaged or lost; aurorae towards the tropics. NOAA counts about four G5 days in an 11-year solar cycle.

How strong it really gets depends on which way the cloud's magnetic field points, which is only measured about an hour before it arrives, as it passes the monitoring spacecraft at L1. The forecast here is the worst of the model's three Kp estimates (one for each way the field might point). If the sky is clear where you are, it may be worth a look for aurorae.

Watch it in the Orrery — the cone shows where the cloud is now, coloured by its threat. Post here if you see aurorae, or notice any effects.

Posted automatically from NASA's DONKI space weather database — the CME's analysis, the model run.