NOAA’s Space Weather Prediction Center is forecasting the possible combined arrival of several coronal mass ejections (CMEs) from early September 8 into September 9, with isolated G1 – Minor geomagnetic storm periods likely and a slight chance of G2 – Moderate conditions. Confidence in the timing and magnitude of the arrivals remains low.
A long-duration M1.9 flare from Active Region 4492 coincided with a filament eruption near N20W67, producing an eruptive sequence associated with an Earth-directed partial-halo CME and an S1 – Minor solar radiation storm on July 30, 2026. WSA-Enlil model runs placed a possible CME arrival at Earth early on August 2, when NOAA’s Space Weather Prediction Center expects G1-G2 (Minor-Moderate) geomagnetic storm conditions.
Multiple coronal mass ejections linked to repeated eruptions from Active Region 4479 are forecast to reach Earth in stages from July 3 through July 6, 2026. NOAA’s official forecast calls for G1–G2 geomagnetic storm conditions on July 3 and 4, while later CME arrivals remain under model assessment.
An X1.1 solar flare from Active Region 4479 produced a full-halo coronal mass ejection (CME) on June 30, 2026, prompting SWPC to issue a G2 – Moderate Geomagnetic Storm Watch for July 3.
A coronal mass ejection (CME) associated with an M1.8 solar flare from Region 4461 is forecast to arrive around midday UTC on June 8. Forecast calls for G1 – Minor to G2 – Moderate storming on June 8 and early June 9, and isolated G3 – Strong periods on June 8.
A G2 – Moderate geomagnetic storm watch is in effect for April 17 and 18, 2026, due to an incoming coronal hole high-speed stream expected to enhance solar wind conditions by late April 17. The event could cause minor operational impacts on high-latitude power systems, satellites, and HF radio communications, while increasing the chance of aurora sightings across northern U.S. states.
An Earth-directed coronal mass ejection (CME) produced by an M2.7 solar flare on March 16, 2026, is expected to impact Earth on March 19, producing G2 – Moderate geomagnetic storming and aurora at mid-latitudes.
A coronal mass ejection (CME) associated with an X8.1 solar flare from Region 4366 at 23:57 UTC on February 1 is forecast to glance Earth late on February 5, 2026. The impact is expected to produce G1 – Minor geomagnetic storm conditions and possible auroral activity poleward of 60 degrees Geomagnetic Latitude. This was the third-strongest solar flare of Solar Cycle 25.
A G4 – Severe or greater geomagnetic storm is forecast for early January 20, 2026, as a full-halo coronal mass ejection from the January 18 X1.9 solar flare approaches Earth. If G4 conditions materialize, auroral activity is expected to expand significantly equatorward, with visibility possible as far south as Alabama and northern California.
Multiple coronal mass ejections (CMEs) launched from Active Region 4334 on January 8, 2026, are expected to deliver a glancing blow to Earth between late January 10 and early January 11, according to the U.S. Space Weather Prediction Center (SWPC). The interaction of several CMEs and a coronal hole high-speed stream is forecast to cause isolated G1 – Minor geomagnetic storm conditions. Aurora may become visible across high latitudes, including the northern tier of the United States, such as northern Michigan and Maine.
