NOAA Space Weather Prediction Center
@NWSSWPC
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Safeguarding society with actionable space weather information.
Boulder, CO
Joined August 2015
WARNING: Geomagnetic K-index of 5 expected.Valid From: 2025 Sep 06 1530 UTC.Valid To: 2025 Sep 06 2359 UTC.Warning Condition: Onset.NOAA Scale: G1 - Minor.Issue Time: 2025 Sep 06 1529 UTC.
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WATCH: Geomagnetic Storm Category G1 Predicted.Highest Storm Level Predicted by Day:.Sep 05: G1 (Minor) Sep 06: G1 (Minor) Sep 07: G1 (Minor).Issue Time: 2025 Sep 05 2112 UTC.
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WATCH: Geomagnetic Storm Category G1 Predicted.Highest Storm Level Predicted by Day:.Sep 05: G1 (Minor) Sep 06: G1 (Minor) Sep 07: None (Below G1).Issue Time: 2025 Sep 04 1917 UTC.
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WATCH: Geomagnetic Storm Category G1 Predicted.Highest Storm Level Predicted by Day:.Sep 04: None (Below G1) Sep 05: None (Below G1) Sep 06: G1 (Minor).Issue Time: 2025 Sep 03 2059 UTC.
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EXTENDED WARNING: Geomagnetic K-index of 5 expected.Extension to Serial Number: 2091.Valid From: 2025 Sep 01 2041 UTC.Now Valid Until: 2025 Sep 03 1500 UTC.Warning Condition: Persistence.Issue Time: 2025 Sep 03 0556 UTC.
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WARNING: Geomagnetic K-Index of 6 expected.Valid From: 2025 Sep 02 1655 UTC.Valid To: 2025 Sep 02 2359 UTC.Warning Condition: Onset.NOAA Scale: G2 - Moderate.Issue Time: 2025 Sep 02 1701 UTC.
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EXTENDED WARNING: Geomagnetic K-index of 5 expected.Extension to Serial Number: 2090.Valid From: 2025 Sep 01 2041 UTC.Now Valid Until: 2025 Sep 03 0600 UTC.Warning Condition: Persistence.Issue Time: 2025 Sep 02 1701 UTC.
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WATCH: Geomagnetic Storm Category G1 Predicted.Highest Storm Level Predicted by Day:.Sep 03: G1 (Minor) Sep 04: None (Below G1) Sep 05: None (Below G1).Issue Time: 2025 Sep 02 1657 UTC.
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CME passage conts, but, its magnetic field is aligned the same as Earth's - this doesn't allow for strong geomagnetic response. We are in the magnetic core of the CME now, so should the orientation turn south - things would escalate quickly. Keep aware at
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The CME arrived near 4:30pm EDT on 1 Sep, 2025, at the L1 orbital point - 1 million miles from Earth. It arrived at Earth very near 5:00pm EDT as noted by the GOES satellites’ magnetometers. Warnings will be issued as appropriate - so stay informed at
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WARNING: Geomagnetic K-Index of 6 expected.Valid From: 2025 Sep 01 2107 UTC.Valid To: 2025 Sep 02 1459 UTC.Warning Condition: Onset.NOAA Scale: G2 - Moderate.Issue Time: 2025 Sep 01 2108 UTC.
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WARNING: Geomagnetic K-index of 5 expected.Valid From: 2025 Sep 01 2041 UTC.Valid To: 2025 Sep 02 2059 UTC.Warning Condition: Onset.NOAA Scale: G1 - Minor.Issue Time: 2025 Sep 01 2044 UTC.
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SWPC notifies critical infrastructure operators about these storms and their potential effects. Those interested in the aurora should visit our webpage at to follow latest info; and follow the local weather forecasts for cloud forecast conditions. @NWS
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Always curious and full of energy, Beagles turn every walk into an adventure 🐾🎉.
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A full-halo CME was observed 30 Aug. It is expected to arrive at Earth late afternoon of 1 Sep EDT and continue into early morning of 2 Sep. Confidence of Earth arrival is high, timing and intensity certainty is fair - with a chance for G4. Visit for more
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WATCH: Geomagnetic Storm Category G3 Predicted.Highest Storm Level Predicted by Day:.Aug 31: None (Below G1) Sep 01: G2 (Moderate) Sep 02: G3 (Strong).Issue Time: 2025 Aug 31 0458 UTC.
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During morning hours of 21 Aug, a fairly fast CME erupted from the far-side of the Sun. Initial measurements suggest estimated speeds of over 3 million mph. If this had been Earth-directed, it could have arrived in close to 24 hours. Visit for the latest
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EXTENDED WARNING: Geomagnetic K-index of 5 expected.Extension to Serial Number: 2088.Valid From: 2025 Aug 19 1828 UTC.Now Valid Until: 2025 Aug 20 1500 UTC.Warning Condition: Persistence.Issue Time: 2025 Aug 20 0255 UTC.
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WARNING: Geomagnetic K-index of 5 expected.Valid From: 2025 Aug 19 1828 UTC.Valid To: 2025 Aug 20 0300 UTC.Warning Condition: Onset.NOAA Scale: G1 - Minor.Issue Time: 2025 Aug 19 1829 UTC.
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WATCH: Geomagnetic Storm Category G1 Predicted.Highest Storm Level Predicted by Day:.Aug 19: G1 (Minor) Aug 20: G1 (Minor) Aug 21: None (Below G1).Issue Time: 2025 Aug 18 1839 UTC.
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WATCH: Geomagnetic Storm Category G1 Predicted.Highest Storm Level Predicted by Day:.Aug 17: None (Below G1) Aug 18: None (Below G1) Aug 19: G1 (Minor).Issue Time: 2025 Aug 16 1601 UTC.
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