Space Weather Message Code: WARK05 Serial Number: 1293 Issue Time: 2016 Dec 22 0233 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1292 Valid From: 2016 Dec 21 1604 UTC Now Valid Until: 2016 Dec 22 1500 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: WARK04 Serial Number: 3083 Issue Time: 2016 Dec 22 0232 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3082 Valid From: 2016 Dec 21 0520 UTC Now Valid Until: 2016 Dec 22 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: WARK05 Serial Number: 1292 Issue Time: 2016 Dec 21 2156 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1291 Valid From: 2016 Dec 21 1604 UTC Now Valid Until: 2016 Dec 22 0300 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 60 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: WARK04 Serial Number: 3082 Issue Time: 2016 Dec 21 1755 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3081 Valid From: 2016 Dec 21 0520 UTC Now Valid Until: 2016 Dec 22 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: ALTK06 Serial Number: 423 Issue Time: 2016 Dec 21 1619 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2016 Dec 21 1613 UTC Synoptic Period: 1500-1800 UTC Active Warning: Yes NOAA Scale: G2 – Moderate NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents – Power grid fluctuations can occur. High-latitude

Space Weather Message Code: WARK06 Serial Number: 368 Issue Time: 2016 Dec 21 1610 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2016 Dec 21 1610 UTC Valid To: 2016 Dec 21 2200 UTC Warning Condition: Onset NOAA Scale: G2 – Moderate NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents – Power grid

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