Space Weather Message Code: ALTK05 Serial Number: 1055 Issue Time: 2016 Dec 21 1606 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2016 Dec 21 1606 UTC Synoptic Period: 1500-1800 UTC Active Warning: Yes 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.

Space Weather Message Code: WARK05 Serial Number: 1291 Issue Time: 2016 Dec 21 1605 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2016 Dec 21 1604 UTC Valid To: 2016 Dec 21 2200 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

Space Weather Message Code: ALTK04 Serial Number: 1940 Issue Time: 2016 Dec 21 1500 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2016 Dec 21 1459 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: WARK05 Serial Number: 1290 Issue Time: 2016 Dec 21 0832 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2016 Dec 21 0831 UTC Valid To: 2016 Dec 21 1500 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

Space Weather Message Code: WARK04 Serial Number: 3081 Issue Time: 2016 Dec 21 0520 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2016 Dec 21 0520 UTC Valid To: 2016 Dec 21 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: 759 Issue Time: 2016 Dec 19 1914 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Dec 20: None (Below G1) Dec 21: G1 (Minor) Dec 22: 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: 758 Issue Time: 2016 Dec 18 2053 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Dec 19: None (Below G1) Dec 20: None (Below G1) Dec 21: 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: 3080 Issue Time: 2016 Dec 17 2349 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2016 Dec 17 2348 UTC Valid To: 2016 Dec 18 1500 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: 3079 Issue Time: 2016 Dec 11 1755 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3078 Valid From: 2016 Dec 08 1615 UTC Now Valid Until: 2016 Dec 11 2359 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: 3078 Issue Time: 2016 Dec 11 1156 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3077 Valid From: 2016 Dec 08 1615 UTC Now Valid Until: 2016 Dec 11 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 –