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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
20 MAY-21 MAY QUIET STORM G1
21 MAY-22 MAY QUIET ACTIVE
22 MAY-23 MAY QUIET QUIET

For more information about the forecast and activity categories see
geomag.bgs.ac.uk/education/activitylevels.html

Activity during last 24 hours

Global   Local (UK)
Date Average Max At time (UTC) Average Max At time (UTC)
19 MAY-20 MAY QUIET ACTIVE 12:00-18:00 QUIET ACTIVE 12:00-18:00

Additional Comments

Solar wind parameters are continuing to trend towards background levels, after the disturbance from a coronal mass ejection (CME) yesterday. There remains a slight chance for a glancing blow from another CME early in the forecast interval, which could elevate geomagnetic activity.
Geomagnetic conditions are expected to remain at mostly QUIET levels throughout the forecast intervals, but there is a chance for some ACTIVE periods, and possibly some STORM G1 periods if the CME arrives.
Time of forecast: 20 May 2026
© UKRI