Space Weather Message Code: ALTK04 Serial Number: 1948 Issue Time: 2017 Jan 21 2245 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Jan 21 2245 UTC Synoptic Period: 2100-2400 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: 3116 Issue Time: 2017 Jan 21 2243 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Jan 21 2242 UTC Valid To: 2017 Jan 22 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: WARK04 Serial Number: 3115 Issue Time: 2017 Jan 20 0351 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Jan 20 0350 UTC Valid To: 2017 Jan 20 1200 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: 3114 Issue Time: 2017 Jan 19 0524 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3113 Valid From: 2017 Jan 18 0955 UTC Now Valid Until: 2017 Jan 19 1800 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: 1947 Issue Time: 2017 Jan 18 1801 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2017 Jan 18 1759 UTC Synoptic Period: 1500-1800 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: 3113 Issue Time: 2017 Jan 18 1741 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3112 Valid From: 2017 Jan 18 0955 UTC Now Valid Until: 2017 Jan 19 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: WARK04 Serial Number: 3112 Issue Time: 2017 Jan 18 0954 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Jan 18 0955 UTC Valid To: 2017 Jan 18 1800 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: 765 Issue Time: 2017 Jan 16 2213 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Jan 17: None (Below G1) Jan 18: G1 (Minor) Jan 19: 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. Induced

Space Weather Message Code: WATA20 Serial Number: 764 Issue Time: 2017 Jan 15 1655 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Jan 16: None (Below G1) Jan 17: None (Below G1) Jan 18: 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: 3111 Issue Time: 2017 Jan 10 1744 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2017 Jan 10 1745 UTC Valid To: 2017 Jan 11 0100 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