Space Weather Message Code: ALTK04 Serial Number: 2027 Issue Time: 2018 Jan 08 1440 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2018 Jan 08 1431 UTC Synoptic Period: 1200-1500 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

Space Weather Message Code: WARK04 Serial Number: 3401 Issue Time: 2018 Jan 08 1319 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2018 Jan 08 1318 UTC Valid To: 2018 Jan 08 1918 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

Space Weather Message Code: WARK04 Serial Number: 3400 Issue Time: 2018 Jan 01 0501 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3399 Valid From: 2017 Dec 31 2010 UTC Now Valid Until: 2018 Jan 01 2100 UTC Warning Condition: Persistence 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 –

Space Weather Message Code: ALTK04 Serial Number: 2026 Issue Time: 2018 Jan 01 0411 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2018 Jan 01 0410 UTC Synoptic Period: 0300-0600 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

Space Weather Message Code: WARK04 Serial Number: 3399 Issue Time: 2017 Dec 31 2011 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Dec 31 2010 UTC Valid To: 2018 Jan 01 0600 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

Space Weather Message Code: WATA20 Serial Number: 815 Issue Time: 2017 Dec 29 1854 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Dec 30: None (Below G1) Dec 31: None (Below G1) Jan 01: G1 (Minor) 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 60 degrees Geomagnetic Latitude.

Space Weather Message Code: WARK04 Serial Number: 3398 Issue Time: 2017 Dec 26 2324 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3397 Valid From: 2017 Dec 26 1958 UTC Now Valid Until: 2017 Dec 27 0600 UTC Warning Condition: Persistence 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 –

Space Weather Message Code: ALTK04 Serial Number: 2025 Issue Time: 2017 Dec 26 2005 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Dec 26 2005 UTC Synoptic Period: 1800-2100 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

Space Weather Message Code: WARK04 Serial Number: 3397 Issue Time: 2017 Dec 26 1958 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Dec 26 1958 UTC Valid To: 2017 Dec 26 2359 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

Space Weather Message Code: WARK04 Serial Number: 3396 Issue Time: 2017 Dec 24 1341 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Dec 24 1340 UTC Valid To: 2017 Dec 25 0600 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