Space Weather Message Code: WARK04 Serial Number: 3091 Issue Time: 2016 Dec 25 2338 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3090 Valid From: 2016 Dec 25 0255 UTC Now Valid Until: 2016 Dec 26 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: 3090 Issue Time: 2016 Dec 25 1318 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3089 Valid From: 2016 Dec 25 0255 UTC Now Valid Until: 2016 Dec 25 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: ALTK04 Serial Number: 1941 Issue Time: 2016 Dec 25 0259 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2016 Dec 25 0259 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

Space Weather Message Code: WARK04 Serial Number: 3089 Issue Time: 2016 Dec 25 0256 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2016 Dec 25 0255 UTC Valid To: 2016 Dec 25 1400 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: 3088 Issue Time: 2016 Dec 24 1323 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3087 Valid From: 2016 Dec 21 0520 UTC Now Valid Until: 2016 Dec 24 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: 3087 Issue Time: 2016 Dec 24 0555 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3086 Valid From: 2016 Dec 21 0520 UTC Now Valid Until: 2016 Dec 24 1400 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: 3086 Issue Time: 2016 Dec 23 1727 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3085 Valid From: 2016 Dec 21 0520 UTC Now Valid Until: 2016 Dec 24 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: 3085 Issue Time: 2016 Dec 23 0555 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3084 Valid From: 2016 Dec 21 0520 UTC Now Valid Until: 2016 Dec 23 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: WARK04 Serial Number: 3084 Issue Time: 2016 Dec 22 1441 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3083 Valid From: 2016 Dec 21 0520 UTC Now Valid Until: 2016 Dec 23 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: ALTK05 Serial Number: 1056 Issue Time: 2016 Dec 22 0308 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2016 Dec 22 0259 UTC Synoptic Period: 0000-0300 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.