NOAA / Space Weather Prediction Center

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Space Weather Alerts

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Alerts Issued in December 2012


Space Weather Message Code: ALTK04
Serial Number: 1622
Issue Time: 2012 Dec 17 1312 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2012 Dec 17 1307 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: WARK04
Serial Number: 2035
Issue Time: 2012 Dec 17 1035 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2012 Dec 17 1100 UTC
Valid To: 2012 Dec 17 1800 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: WARPX1
Serial Number: 386
Issue Time: 2012 Dec 15 0158 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2012 Dec 15 0157 UTC
Valid To: 2012 Dec 15 1200 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.