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 Dec 12 1940 UTC Valid To: 2025 Dec 13 0900 UTC Warning Condition: Onset NOAA Scale: G1 - Minor Issue Time: 2025 Dec 12 1942 UTC https://t.co/ZbtuNtJdza
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EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 2153 Valid From: 2025 Dec 11 1900 UTC Now Valid Until: 2025 Dec 12 0900 UTC Warning Condition: Persistence Issue Time: 2025 Dec 12 0555 UTC https://t.co/ZbtuNtJdza
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EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 2152 Valid From: 2025 Dec 11 1900 UTC Now Valid Until: 2025 Dec 12 0600 UTC Warning Condition: Persistence Issue Time: 2025 Dec 11 2339 UTC https://t.co/ZbtuNtJdza
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WARNING: Geomagnetic K-index of 5 expected Valid From: 2025 Dec 11 1900 UTC Valid To: 2025 Dec 12 0000 UTC Warning Condition: Onset NOAA Scale: G1 - Minor Issue Time: 2025 Dec 11 1919 UTC https://t.co/ZbtuNtJdza
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EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 2150 Valid From: 2025 Dec 10 2115 UTC Now Valid Until: 2025 Dec 11 1200 UTC Warning Condition: Persistence Issue Time: 2025 Dec 11 0339 UTC https://t.co/ZbtuNtJdza
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EXTENDED WARNING: Geomagnetic K-Index of 6 expected Extension to Serial Number: 628 Valid From: 2025 Dec 10 2200 UTC Now Valid Until: 2025 Dec 11 0600 UTC Warning Condition: persistence Issue Time: 2025 Dec 11 0255 UTC https://t.co/ZbtuNtJdza
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EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 2149 Valid From: 2025 Dec 10 2115 UTC Now Valid Until: 2025 Dec 11 0600 UTC Warning Condition: Onset Issue Time: 2025 Dec 10 2207 UTC https://t.co/ZbtuNtJdza
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WARNING: Geomagnetic K-Index of 6 expected Valid From: 2025 Dec 10 2200 UTC Valid To: 2025 Dec 11 0300 UTC Warning Condition: Onset NOAA Scale: G2 - Moderate Issue Time: 2025 Dec 10 2157 UTC https://t.co/ZbtuNtJdza
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WARNING: Geomagnetic K-index of 5 expected Valid From: 2025 Dec 10 2115 UTC Valid To: 2025 Dec 11 0300 UTC Warning Condition: Onset NOAA Scale: G1 - Minor Issue Time: 2025 Dec 10 2117 UTC https://t.co/ZbtuNtJdza
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CANCEL WATCH: Geomagnetic Storm Category G3 Predicted Cancel Serial Number: 94 Original Issue Time: 2025 Dec 07 0443 UTC Comment: Enhancement from anticipated CME did not occur Issue Time: 2025 Dec 09 2103 UTC 2025 Dec 07 0443 UTC https://t.co/ZbtuNtJdza
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Region 4298 produced an impulsive X1.1/2b flare (R3-Strong Radio Blackout) at 08/0501 UTC.
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ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2025 Dec 08 0500 UTC NOAA Scale: R2 - Moderate Issue Time: 2025 Dec 08 0502 UTC https://t.co/ZbtuNtJdza
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WATCH: Geomagnetic Storm Category G3 Predicted Highest Storm Level Predicted by Day: Dec 08: G1 (Minor) Dec 09: G3 (Strong) Dec 10: G1 (Minor) Issue Time: 2025 Dec 07 0443 UTC https://t.co/ZbtuNtJdza
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A full-halo coronal mass ejection (CME), associated with an M8.1 flare from Region 4299 at 20:39 UTC on 06 December, is expected to impact Earth early to midday on 09 December, potentially causing periods of G3 (Strong) geomagnetic storming.
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Active Region 4299, near the north-central part of the solar disk, produced an M8.1 flare (NOAA Scale R2-Moderate) that peaked at 06/2039 UTC. Analysis will be performed on any associated CMEs. Monitor our webpage for updates.
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ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2025 Dec 06 2037 UTC NOAA Scale: R2 - Moderate Issue Time: 2025 Dec 06 2041 UTC https://t.co/ZbtuNtJdza
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WARNING: Geomagnetic K-index of 5 expected Valid From: 2025 Dec 06 0836 UTC Valid To: 2025 Dec 06 2359 UTC Warning Condition: Onset NOAA Scale: G1 - Minor Issue Time: 2025 Dec 06 0837 UTC https://t.co/ZbtuNtJdza
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WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Dec 06: None (Below G1) Dec 07: G1 (Minor) Dec 08: G1 (Minor) Issue Time: 2025 Dec 05 1922 UTC https://t.co/ZbtuNtJdza
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WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Dec 05: None (Below G1) Dec 06: None (Below G1) Dec 07: G1 (Minor) Issue Time: 2025 Dec 04 2129 UTC https://t.co/ZbtuNtJdza
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EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 2146 Valid From: 2025 Dec 03 1425 UTC Now Valid Until: 2025 Dec 05 0000 UTC Warning Condition: Persistence Issue Time: 2025 Dec 04 1158 UTC https://t.co/ZbtuNtJdza
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