Space Weather Message Code: ALTK05 Serial Number: 1150 Issue Time: 2017 Sep 08 1201 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Sep 08 1159 UTC Synoptic Period: 0900-1200 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: WARK06 Serial Number: 396 Issue Time: 2017 Sep 08 0537 UTC EXTENDED WARNING: Geomagnetic K-Index of 6 expected Extension to Serial Number: 395 Valid From: 2017 Sep 07 2255 UTC Now Valid Until: 2017 Sep 08 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 55 degrees Geomagnetic Latitude. Induced Currents –

Space Weather Message Code: WARK04 Serial Number: 3310 Issue Time: 2017 Sep 08 0533 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 3309 Valid From: 2017 Sep 06 2330 UTC Now Valid Until: 2017 Sep 08 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: ALTK05 Serial Number: 1149 Issue Time: 2017 Sep 08 0452 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Sep 08 0452 UTC Synoptic Period: 0300-0600 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: ALTK08 Serial Number: 24 Issue Time: 2017 Sep 08 0151 UTC ALERT: Geomagnetic K-index of 8 Threshold Reached: 2017 Sep 08 0151 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes NOAA Scale: G4 – Severe NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude. Induced Currents – Possible widespread voltage control problems and

Space Weather Message Code: ALTK07 Serial Number: 107 Issue Time: 2017 Sep 08 0116 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2017 Sep 08 0116 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes NOAA Scale: G3 – Strong NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude. Induced Currents – Power system voltage irregularities possible, false

Space Weather Message Code: ALTK06 Serial Number: 441 Issue Time: 2017 Sep 08 0028 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2017 Sep 08 0027 UTC Synoptic Period: 0000-0300 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: ALTK05 Serial Number: 1148 Issue Time: 2017 Sep 08 0022 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2017 Sep 08 0022 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.

Space Weather Message Code: ALTK08 Serial Number: 23 Issue Time: 2017 Sep 07 2350 UTC ALERT: Geomagnetic K-index of 8 Threshold Reached: 2017 Sep 07 2350 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes NOAA Scale: G4 – Severe NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude. Induced Currents – Possible widespread voltage control problems and

Space Weather Message Code: ALTK07 Serial Number: 106 Issue Time: 2017 Sep 07 2325 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2017 Sep 07 2325 UTC Synoptic Period: 2100-2400 UTC Active Warning: Yes NOAA Scale: G3 – Strong NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude. Induced Currents – Power system voltage irregularities possible, false