Space Weather Message Code: ALTK04
Serial Number: 1845
Issue Time: 2015 Dec 31 0105 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2015 Dec 31 0105 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

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.

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Space Weather Message Code: SUMSUD
Serial Number: 217
Issue Time: 2015 Dec 31 0103 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2015 Dec 31 0051 UTC
Deviation: 25 nT
Station: Jeju

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

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Space Weather Message Code: WARK05
Serial Number: 1129
Issue Time: 2015 Dec 31 0059 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2015 Dec 31 0058 UTC
Valid To: 2015 Dec 31 1300 UTC
Warning Condition: Onset
NOAA Scale: G1 – Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents – Weak power grid fluctuations can occur.
Spacecraft – Minor impact on satellite operations possible.
Aurora – Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

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Space Weather Message Code: WARSUD
Serial Number: 171
Issue Time: 2015 Dec 31 0016 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2015 Dec 31 0030 UTC
Valid To: 2015 Dec 31 0130 UTC
IP Shock Passage Observed: 2015 Dec 31 0002 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

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Space Weather Message Code: WARK04
Serial Number: 2754
Issue Time: 2015 Dec 31 0016 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2015 Dec 31 0030 UTC
Valid To: 2015 Dec 31 1300 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

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.

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Space Weather Message Code: WATA50
Serial Number: 59
Issue Time: 2015 Dec 30 2136 UTC

WATCH: Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Dec 31: G3 (Strong) Jan 01: G1 (Minor) Jan 02: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents – Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft – Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation – Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio – HF (high frequency) radio may be intermittent.
Aurora – Aurora may be seen as low as Pennsylvania to Iowa to Oregon.