Similar to the bulletins put out by the NWS local forecast offices, SWPC provides Alerts, Watches and Warnings to the public at large about what to expect from Space Weather. These bulletins are ...

A Coronal Mass Ejection (CME) arrived at Earth on 10 October. The CME signature was observed in the solar wind beginning at 10/1434 UTC. A sudden impulse of 56 nT was then recorded at the Niemegk, ...

SWPC has issued a G2 (Moderate) geomagnetic storm Watch for 11 Oct 2026. The Watch covers the expected arrival of two coronal mass ejections (CMEs) that left the Sun on 07 and 08 Oct. The 08 Oct CME ...

G1 (Minor) to G2 (Moderate) geomagnetic storms are likely on 09 Oct with the arrival of a CME that was associated with a M1.4 flare from Active Region 4549 on 06 Oct. A high chance for additional ...

Geomagnetic activity in response to CMEs that departed the Sun on 25 Aug is now anticipated to extend into 29 Aug. A G1 (Minor) geomagnetic storm watch remains for 27 Aug for expected CH HSS ...

A G1 (Minor) geomagnetic storm watch has been issued for 27 Aug for expected CH HSS influences and a G2 (Moderate) geomagnetic storm watch has been issued for 28 Aug for the anticipated arrival of ...

What Changed? Now that the new solar wind display has completed its experimental review period, the experimental banner has been removed from the title and it has become the operational display for ...

The geomagnetic field reached G2 (Moderate) storm levels at 02/1759 UTC, following the arrival of a CME. Additional G2 storm periods are expected through 02/2359 UTC, with G1 (Minor) storming expected ...

HF Radio: Weak or minor degradation of HF radio communication on sunlit side, occasional loss of radio contact. Navigation: Low-frequency navigation signals degraded for brief intervals.

SOLAR-1 is now operational! The new SOLAR-1 observations can be seen on our webpage at Solar Wind Observations. The full NOAA statement about SOLAR-1 now being operational is here.

The current forecast calls for combined CME arrival around mid-afternoon EDT of June 4, with up to G3 levels possible afterwards. CME passage would likely continue into the evening and possibly ...

HF Radio: Weak or minor degradation of HF radio communication on sunlit side, occasional loss of radio contact. Navigation: Low-frequency navigation signals degraded for brief intervals.