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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
19 MAR-20 MAR STORM G1 STORM G3
20 MAR-21 MAR STORM G1 STORM G3
21 MAR-22 MAR ACTIVE STORM G2

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)
18 MAR-19 MAR QUIET QUIET 21:00-00:00 QUIET QUIET 21:00-00:00

Additional Comments

The expected arrivals of several coronal mass ejections (CMEs) observed between 16-Mar and 18-Mar will increase geomagnetic activity during this forecast period.
Due to their occurrence in relatively quick succession, those CMEs may merge along the way which would lead to a strong combined impact. Intervals of up to STORM G3 are anticipated.
Coronal hole high-speed stream will follow shortly after, during the last forecast period, keeping already enhanced geomagnetic conditions at elevated levels.
Time of forecast: 19 Mar 2026
© UKRI