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Space Weather Prediction Center

03/18/2026 | News release | Distributed by Public on 03/18/2026 15:08

G2 Watch for 19-21 March due to CME and CH HSS Effects

A G2 Watch is in effect 19-21 March due to a mix of potential CME arrivals and CH HSS effects. While there is a high level of uncertainty related to the CME arrivals, there is more certainty regarding the likely CH HSS effects to begin by 21 March, with at least a G2 storm levels likely. There is at least a slight chance for G3 (Strong) storm conditions throughout this period. Continue to follow our webpage for the latest forecasts and updates about this activity.

Space Weather Prediction Center published this content on March 18, 2026, and is solely responsible for the information contained herein. Distributed via Public Technologies (PUBT), unedited and unaltered, on March 18, 2026 at 21:08 UTC. If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]

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